Comorbidity Between Factitious and Borderline Personality Disorder: A Narrative Analysis.

BACKGROUND: Factitious disorder (FD) illnesses have increased recently, primarily due to comorbidity with borderline personality disorder (BPD). Psychiatrists, hospital doctors, and general practitioners are interested in and concerned about patients with comorbid FD-BPD. SUBJECTS AND METHODS: We used a qualitative analysis of prototypical narratives collected as vignettes by merging individual contributions, case histories, naturalistic observations, and data from mental health practitioners into specific descriptions. Our study used a phenomenological and narrative method to illustrate the contents and behaviours in FD-BPD comorbidity. RESULTS: Fourteen case vignettes were created from our case studies. These categories included knowledge of symptoms and medical terms, dramatisation, symptoms ambiguity, unexplainable deterioration of symptoms, symptom inventiveness, craving for painkillers, conflicts with health carers, hospital migration, piling of medication and search for invasive diagnostic procedures. CONCLUSIONS: The combined use of narrative analysis and naturalistic observation has helped identify a unique comorbid condition of FD-BPD, which is not yet clearly described in its behavioural components by the international literature. The current study presents novel findings into a condition becoming progressively popular in psychiatric and medical settings.

Munchausen syndrome by proxy (MSBP): a review regarding perpetrators of factitious disorder imposed on another (FDIA).

Munchausen syndrome by proxy (MSBP) is well-known to clinicians, but its usage is discouraged now in favor of other terms placing emphasis on the victim. This study aims to determine the most common characteristics of perpetrators but only in case reports labeled as MSBP, published in PubMed literature in the past 15 years. MSBP has been described as a rare form of abuse due to illness falsification, where the perpetrator usually receives the diagnosis of factitious disorder imposed on another (FDIA). We extracted data from 108 articles, including 81 case reports. Almost all perpetrators were female (91% female, 1% female and male, 7% unreported). Twenty-three cases (28%) had a perpetrator with psychiatric diagnosis: factitious disorder imposed on self (10%), depression (9%), and personality disorders (7%). In more than one-third (36%) there was familial conflict or abuse. Fourteen cases (17%) had perpetrators working in healthcare. The most common type of falsification was induction (74%); however, 15% of cases had more than one type of falsification. The most common outcomes were: separation (37%); no follow-up (22%); imprisonment (14%); death of victim (12%); treatment of the perpetrator (10%); continued living together (4%); and suicide of perpetrator (1%). Recurrence was present in more than three quarters of cases. Our results reiterate that awareness of the most common findings in MSBP allows physicians to identify them in a clinical context.

A descriptive, retrospective case series of patients with factitious disorder imposed on self.

BACKGROUND: Despite cases of factitious disorder imposed on self being documented in the literature for decades, it appears to remain an under-identified and under-diagnosed problem. The present study aimed to explore factitious disorder imposed on self in a series of French patients. METHODS: Patients 18 years old and over with factitious disorder imposed on self were retrospectively included by two independent reviewers according to DSM-5 criteria in Rennes University Hospital for the period 1995 to 2019. Patients were identified from a clinical data warehouse. RESULTS: 49 patients with factitious disorder imposed on self were included. Among them, 36 (73.5%) were female. The average age at diagnosis was 38.4 years. The 16 patients with a health-related profession were all female. Direct evidence of falsification was found in 20.4% of cases. Falsification was mainly diagnosed on the basis of indirect arguments: history of factitious disorder diagnosed in another hospital (12.2%), extensive use of healthcare services (22.4%), investigations that were normal or inconclusive (69.4%), inconsistent or incomplete anamnesis and/or patient refusal to allow access to outside information sources (20.4%), atypical presentation (59.2%), evocative patient behaviour or comments (32.7%), and/or treatment failure (28.6%). Dermatology and neurology were the most frequently involved specialities (24.5%). Nine patients were hospitalized in intensive care. Some of them received invasive treatments, such as intubations, because of problems that were only reported or feigned. The diagnosis of factitious disorder imposed on self was discussed with the patient in 28 cases (57.1%). None of them admitted to making up the disorder intentionally. Two suicide attempts occurred within 3 months after the discussion of the diagnosis. No deaths were recorded. 44.9% of the patients returned to the same hospital at least once in relation to factitious disorder imposed on self. CONCLUSIONS: The present study reinforces data in favour of a predominance of females among patients with factitious disorder imposed on self. This diagnosis is difficult and is based on a range of arguments. While induced cases can be of low severity, cases that are only feigned can lead to extreme medical interventions, such as intubation.

Incidence of the diagnosis of factitious disorders - Nationwide comparison study between Germany and Norway.

Factitious disorders (FD) like Munchausen syndrome are well known to most physicians, yet the corresponding ICD-10 diagnosis F68.1 remains severely under-assigned and often misdiagnosed. To approach this problem, we conducted a nationwide inquiry for Germany and Norway as well as a comparison between these two countries regarding the incidence of diagnosis of FD. The assignment rates of F68.1 in somatic hospitals from 2008 to 2016 were analyzed based on the Diagnosis Related Groups statistic from the German Federal Statistical Office and the data provided from the Norwegian Patient Registry. The Norwegian data also included information on individual patients whereas the German data only contained the total number of F68.1 assignment due to strict medical confidentiality laws. The incidence of the diagnosis of FD in Germany and Norway showed similar assignment rates with 3.71 and 3.18 per 100,000, respectively. The mean age was 39.4 years for German patients and 35.6 years for Norwegian patients. The gender distribution was almost equal for the individual patients' rate (49% female and 51% male). Furthermore, our results indicate that female patients with FD tend to demand healthcare services more frequently than male patients. Smaller studies focusing on the diagnosis of FD have significantly higher assignment rates compared to nationwide inquiries. Our results illustrate substantial differences between estimations of the incidence of FD and the need for further studies. Besides the many obstacles associated with diagnosis of FD, strict medical confidentiality laws prevent reliable and scientific investigations of this matter.

Changing incidence of factitious renal stone disease
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PURPOSE: We sought to describe patterns of factitious urinary stone submission over time by investigating a contemporary stone analysis database and comparing two distinct time points. MATERIALS AND METHODS: We retrospectively reviewed a single stone analysis lab database at two time points, 1990 and 2010, and compared total incidence of factitious stone submission, as well as gender patterns and type of factitious stone submitted. RESULTS: A total of 27,014 stones were analyzed, 16,216 (60%) from 1990 and 10,798 (40%) from 2010 with a decrease in total incidence from 2.6% (428/16,216) in 1990 to 1.2% (131/10,798) in 2010 (p < 0.001). In 1990, women were significantly more likely to submit a factitious stone (RR 1.5, 95% CI 1.4 - 1.7, p < 0.001), while in 2010 there was no gender difference (RR 0.9, 95% CI 0.8 - 1.03, p < 0.05). Plant material and geologic material represented the most common factitious stone types respectively, in both 1990 and 2010. CONCLUSION: In the largest contemporary review of spurious urinary stones, we find a decreased incidence and increased gender equivalence of factitious urinary stones in 2010 compared to 1990.
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Psychocutaneous disease: Clinical perspectives.

Psychocutaneous disease, defined in this review as primary psychiatric disease with skin manifestations, is commonly encountered in dermatology. Dermatologists can play an important role in the management of psychocutaneous disease because patients visit dermatology for treatment of their skin problems but often refuse psychiatric intervention. This review describes common psychocutaneous syndromes, including delusional, factitious, obsessive-compulsive and related, and eating disorders, as well as psychogenic pruritus, cutaneous sensory (pain) syndromes, posttraumatic stress disorder, and sleep-wake disorders. The updated classification of these disorders in the Diagnostic and Statistical Manual of Mental Disorders, 5th edition is included. Strategies for management are reviewed.

Dermatitis Artefacta in Childhood: A Retrospective Analysis of 44 Patients, 1976-2006.

BACKGROUND: Dermatitis artefacta (DA) consists of self-inflicted skin lesions that the patient denies having produced. OBJECTIVES: To conduct a single-center retrospective clinical review of children and adolescents diagnosed with DA. METHODS: From 1976 to 2006, data were collected on children diagnosed with DA who were seen in the Department of Dermatology in our hospital. Clinical and epidemiologic features are described. Forty-four children (mean age 12.9 yrs) were selected, representing 21.9% of the total patients with DA recorded (n = 201) during this period. RESULTS: The most frequent clinical forms were excoriations (16 [36.4%]) and ulcers (10 [22.7%]), followed by blisters (7 [15.9%]), burns (3 [6.8%]), contact dermatitis (3 [6.8%]), hematomas (2 [4.5%]), panniculitis (1 [2.3%]), cheilitis (1 [2.3%]), and hyperpigmentation (1 [2.3%]). Sixteen were located exclusively on the face and neck, whereas 28 also had other locations (upper limbs, n = 10; lower limbs, n = 9; thorax, n = 5; abdomen, n = 4). Cutaneous lesions were treated with occlusive bandages using zinc paste or a plaster splint when necessary. CONCLUSION: To our knowledge, this is the largest reported series of DA in childhood. This complicated psychodermatologic condition requires correct diagnosis, appropriate management, and psychiatric assessment.

[Are artificial disorders common in palliative care? A Case report]. / Sind artifizielle Störungen im palliativen Kontext häufig? Ein Fallbericht.

The main task of palliative care specialists is to focus on symptom control such as pain, nausea or fatigue. Thorough anamnesis, physical examination, laboratory examination, and differential diagnosis can ensure appropriate treatment. In an increasing number of cases psychiatric conditions like depression or anxiety increase also occur so palliative care physicians need to be more prepared to handle them. The question of this case report is, how a palliative care specialist can distinguish between a malignant disease or neurological disease progression and a presentation primarily psychiatric in etiology, as is the case in factitious disorders. We are also interested in the incidence rate of such factitious disorders. Our case study demonstrates that it is rare but not impossible that a doctor will encounter factitious symptoms in the palliative setting. This suggest being aware of evidence of psychiatric origins even in discharge letters and referrals that indicate palliative care needs, to ensure that palliative care really is the best treatment option for the patient. We do believe such cases to be rare in a palliative setting, however.

Dermatitis artefacta: a retrospective analysis.

BACKGROUND: Factitial dermatitis describes self-produced and consciously made skin lesions usually intended to win sympathy, avoid responsibilities and even gain disability insurance. Dermatitis artefacta belongs to an extensive spectrum of self-inflicted diseases termed factitious diseases. OBJECTIVES: The study is retrospective, and the patients were seen in our department from 2002 to 2012. MATERIALS AND METHODS: For patients with skin lesions, the demographic features and clinical descriptive characteristics of their lesions were ascertained. Patient files and photographs were reviewed and the patients were called for follow-up. RESULTS: A total of 25 patients were recorded. Mean age of the patients was 25.64 ± 11.80. With the exception of two cases, all patients were females. With regard to location, 27% of the patients showed facial localization, whereas the lesions have been localized on the extremities in 44%. The most common clinical appearance of DA was crusted eroded lesions (24%) and excoriations (24%) followed by ulcers (12%), superficial erosion (12%), acute eczematous lesions (8%), purpuric lesions (8%), pigment application (8%), diffuse erythema (8%), hyperpigmentation (8%), blister (4%), hair cutting (4%), hypopigmentation (4%) and cellulitis (4%). Forty percent of the patients had multiple lesions. There were eight children with dermatitis artefacta whose mean age was 14.50. The predominant lesion in these cases was superficial eroded plaque (37.5%). While patients with mild lesions limited in number receive ambulatory care, almost half of the patients require hospitalization. In this study, all patients were referred to psychiatric consultation, but most of them either refused treatment or did not receive medications. CONCLUSION: Although it is primarily a psychiatric disease, dermatitis artefacta is frequently diagnosed by dermatologists. Detailed history and physical examination are key factors because it imitates an extensive spectrum of diseases.

Somatoform, factitious, and related diagnoses in the national hospital discharge survey: addressing the proposed DSM-5 revision.

BACKGROUND: The DSM-5 working group on the somatoform (SFD) and factitious (FD) disorders has recommended substantial revisions of these categories. The recommendations are based, in part, on anecdotal evidence that the diagnoses are infrequently used. OBJECTIVE: To assess the assignment rates for SFD, FD, and related diagnoses among general medical inpatients. METHOD: The National Hospital Discharge Survey was queried for instances of SFD and FD, along with related diagnoses identifying medical cases in which psychological factors play a role. Diagnoses of major depression and generalized anxiety disorder were queried for comparison purposes. RESULTS: The target diagnoses were assigned far less frequently than published prevalence and recognition rates suggest. Nearly half of the assigned target diagnoses were generic diagnoses (esp. physiological malfunction due to psychological factors) other than SFD or FD. However, the apparent degree of underassignment of the target diagnoses was not dramatically greater than the underassignment observed for major depression and generalized anxiety disorder. CONCLUSION: The results provide empirical support for the impression that physicians do not assign SFD and FD diagnoses in recognized cases, but do not strongly support the assertion that these diagnoses are uniquely problematic.

Factitious hand disorders: review of 29 years of multidisciplinary care.

PURPOSE: To improve our understanding of factitious hand disorders with a review of our experience over 29 years in a multidisciplinary hand center. METHODS: A retrospective chart review was performed to identify workers' compensation patients treated for factitious hand disorders in the multidisciplinary hand center between January 1981 and September 2010. Multidisciplinary evaluation at this center involved evaluation by hand surgeons, occupational therapists, and psychologists. Data collected include age, sex, race, educational level, clinical presentation, number of diagnostic tests, number of surgeries, time to referral to the multidisciplinary center, direct cost of care, psychological diagnosis, Minnesota Multiphasic Personality Inventory, treatment modalities, and work status. RESULTS: We identified 174 workers' compensation patients with factitious hand disorders. Presentation was used to classify patients into 1 of 4 categories: psychopathological dystonia, factitious edema, psychopathological complex regional pain syndrome, and factitious wound creation and manipulation. There were statistically significant differences between the 4 categories in demographics, utilization of medical resources, psychopathology, treatment modalities, and return-to-work status. Patients with factitious wounds were more educated, used more medical resources, demonstrated an angry or hostile profile, and experienced a lower return-to-work rate. Patients with dystonia were less educated, used less medical resources, demonstrated a hypochondriasis or depressed profile, and experienced a higher return-to-work rate. CONCLUSIONS: Treatment of factitious hand disorders remains frustrating and costly due to failure or recurrence after traditional approaches. This review is a large-scale examination of the factitious hand disorder population that demonstrates the unique pathology involved in each of the 4 categories. There is a specific association between the category of hand disorder and the underlying pathology and prognosis. TYPE OF STUDY/LEVEL OF EVIDENCE: Prognostic IV.

Prevalence and characteristics of military malingering.

The authors' principle objective was determining the prevalence and characteristics of medical malingering in the military. The authors accessed an electronic database used by the Department of Defense to monitor and manage military health care activities worldwide. The authors searched the database from 2006 to 2011 in the Northern Regional Medical Command for all instances where a health care provider, consequent to an outpatient medical visit, diagnosed malingering, factitious disorder with psychological symptoms, or factitious disorder with physical symptoms. During the time period studied, the Northern Regional Medical Command reported 28,065,568 health care visits. During the same time period, clinicians diagnosed 1,074 individuals with malingering, factitious disorder with predominantly psychological signs and symptoms, or factitious disorder with predominantly physical signs and symptoms. The typical subject diagnosed with one of these disorders was young, male, nonmarried, and enlisted. Although most diagnoses came from a mental health clinic, other medical specialties also contributed to the total tally. These diagnoses are extremely rare based on the findings from this study of outpatient medical care visits.

Dermatitis artefacta: a review.

Dermatitis artefacta is a rarely diagnosed disorder that is often a source of perplexity and anxiety for dermatologists because they know less about the cause of this self-inflicted condition than the patients themselves. It differs from other skin disorders in that diagnosis is made by exclusion rather than on the basis of histologic and biochemical findings and therefore involves a considerable investment of time and resources. Based on the findings of a study of 201 patients diagnosed with dermatitis artefacta between 1976 and 2006, we review the different clinical presentations of this skin disorder and discuss its diagnosis and treatment. The series analyzed comprised 152 women and 49 men (female to male ratio of 3.1:1) with a mean age of 31.2 years. The patients were mostly single and had a low educational level and few or no job qualifications or skills.

Psychopathology of perpetrators of fabricated or induced illness in children: case series.

BACKGROUND: Munchausen's syndrome by proxy (recently renamed fabricated or induced illness) is a rare form of child abuse, but relatively little is known about the psychopathology of the perpetrators. AIMS: To examine the medical, psychiatric, social work and forensic records of mothers referred for detailed psychiatric assessment from 1996 to 2009. METHOD: Twenty-eight consecutive individuals with a putative diagnosis of fabricated or induced illness were referred to the authors for detailed psychiatric assessment and recommendations about management (25 from family courts). We scrutinised all medical and psychiatric records and interviewed them, as well as informants. RESULTS: In total, 16 (57%) had evidence of a current somatoform disorder, and factitious disorders (either past or current) were identified in 18 (64%): 11 participants had both somatoform and factitious disorders. Nine participants (32%) had non-epileptic attacks. We found evidence of pathological lying (pseudologia fantastica) in 17 (61%) of the participants; in some there were key links between early abusive experiences, the development of pathological lying and the eventual fabrication of illness in the child victim. CONCLUSIONS: A chronic somatoform disorder or factitious disorder (or both) was detected in almost two-thirds of the participants. Over half of the mothers exhibited pathological lying, in some dating from adolescence, and this often continued into adult life eventually involving the child in a web of deceit and abuse. Psychiatrists whose work brings them into contact with women with chronic somatoform or factitious disorders, especially if there is evidence of lying from an early age, should always be alert to the impact of these illnesses on any dependent children.

Physician-based estimates of medically unexplained symptoms: a comparison of four case definitions.

BACKGROUND: Medically unexplained symptoms (MUS) are considered a common occurrence in medical settings, although definitions, methodologies and resulting prevalence rates for MUS vary widely between studies. OBJECTIVES: The objective of the present study was to characterize physicians' estimates of MUS, including clinically significant MUS, and to demonstrate in a single study how estimates vary based on the definition used. METHODS: Two hundred and thirteen physicians completed an online questionnaire regarding the number of patients who present to their clinic with MUS. To reduce memory biases, participants reported on the number of patient seen in their most recent clinic day who met increasingly restrictive case definitions for MUS. Weekly estimates were also obtained. RESULTS: The least restrictive definition yielded an estimate of 11%. When certainty criteria were added to the definition of MUS, the estimate decreased considerably to 4%. Approximately 3% of patients were estimated to have chronic MUS that affected their daily functioning or caused significant distress (i.e. psychologically significant MUS), and only half of these, 1.5%, were assigned a diagnosis of somatoform disorder or factitious disorder. The proportion of MUS cases accounted for by malingering was 18%. CONCLUSIONS: The present study documents significantly lower estimates of MUS than chart review studies. However, our results suggest that a significant proportion of the total number of patients who present with MUS have abnormal illness behaviour associated with significant impairment or distress. Despite physicians' recognizing significant distress and dysfunction in these cases, formal diagnoses of somatoform or factitious disorder are rarely assigned.

Dermatitis artefacta of the breast: a retrospective analysis of 27 patients (1976-2006).

BACKGROUND: Dermatitis artefacta (DA) is defined as all dermatological, self-inflicted skin lesions, where the patient denies having produced the lesions. OBJECTIVES: The purpose of this study is to make a single-centre retrospective clinical review of patients diagnosed as DA of the breast. MATERIALS AND METHODS: During a 30-year period (1976-2006), patients diagnosed as DA of the breast, seen in the Department of Dermatology of the Virgen Macarena Hospital in Seville, were recorded. Clinical and epidemiological features are described. RESULTS: A total of 27 women with a mean age of 34.33 years were selected representing 13.43% of the total of DA patients recorded (n=201) in this period. The most frequent clinical forms were: excoriations (nine patients, 33.33%) and ulcers (nine patients, 33.33%), followed by burns (six patients, 22.22%), blisters (one patient, 3.70%), contact dermatitis (one patient, 3.70%) and haematomas (one patient, 3.70%). Ten of the cases were located exclusively on the breasts, whereas 17 had also other locations such as face in seven cases, arms in five cases, abdomen in five cases and the entire body in two cases. Cutaneous lesions were treated with occlusive bandages using zinc paste or plaster splint when necessary. CONCLUSION: To our knowledge, this is the major series of DA of the breast studied. This complicated psychodermatological condition requires a correct diagnosis, appropriate management and psychiatric assessment.

Illness deception and work: incidence, manifestations and detection.

BACKGROUND: Illness deception (ID) may be difficult to detect. Objective techniques that improve a doctor's skills of detection will have benefits for the health economy. AIMS: To ascertain the incidence of ID in a general occupational medicine clinic, to give examples by way of case vignettes how it may manifest and to compare the variability of maximal grip strength measurements of patients with suspected simulated weakness of grip with controls. METHODS: Four hundred consecutive new patient referrals were examined by the author and those who met Diagnostic and Statistical Manual-IV criteria for factitious disorder (FD) or malingering identified. Those with suspected simulated weakness of grip were asked to perform three consecutive maximal grips with a Jamar hand dynamometer. One hundred normal subjects and 100 patients with rheumatoid arthritis (RA) of the hands were similarly tested. RESULTS: Thirty-two of 400 (8%) patients exhibited behaviour in keeping with ID (29 malingering and 3 FD). Cases included simulated hand-arm vibration syndrome, occupational asthma, deafness and weakness of a limb. The median and 90th percentile for coefficient of variation (CV) of three consecutive maximal grip strengths for normal subjects and patients with RA were 5.2, 10.5%; 5.4, 14.5% right and 4.5, 10.2%; 6.0, 14.4% left hand, respectively. The CV of the six patients who simulated weakness of grip was from 17.3 to 37.8%. CONCLUSIONS: ID is relatively common in occupational medical practice and multiform in its manifestations. Simulated weakness of grip should be suspected when consecutive declared maximal grip strengths are inexplicably submaximal for age and sex and highly variable in force.

Clinical, demographic, psychological, and behavioral features of factitious disorder: A retrospective analysis.

BACKGROUND: Consultation psychiatrists are often asked to assess factitious disorder (FD), yet this is challenging as confirmation depends on rarely achieved direct evidence of illness-inducing behaviors. Diagnosis is thus based on other variables, such as atypical features of the medical presentation and certain patient behaviors. This study sought to assess a cohort of patients with FD for demographic and clinical variables, but also psychological and behavioral ones unexamined in previous studies. METHODS: 49 previously-identified FD patients at a single site were reviewed retrospectively and variables collected included demographic, medical, psychiatric, social, behavioral, and treatment-related. Descriptive statistical analysis was used. RESULTS: Patients were mostly: 1) under age 40 (82%), 2) female (90%), 3) with past psychiatric (92%), family psychiatric (78%), and traumatic (69%) histories; 4) direct intravenous access (67%); and 7) some exposure to healthcare training (67%). All (100%) subjects had an identifiable family dynamic issue, including household abuse, parental divorce, parental influence/enmeshment, grief, and/or significant other conflict. Financial, emotional, or social incentives were common, and most patients (88%) exhibited at least 4 FD-related behaviors. CONCLUSION: FD represents a complex disorder of abnormal illness behaviors with predisposing developmental and perpetuating sociobehavioral variables previously unexplored. Future investigational, educational, and quality improvement directions are considered.

Axis I comorbidity and psychopathologic correlates of autodestructive syndromes.

OBJECTIVE: Nonsuicidal deliberate self-harm and factitious disorders have been proposed as subtypes within the autodestructive behavior spectrum, basically differing in the issue of concealment. Aims are to determine Axis I diagnoses and psychopathologic correlates of open self-harmers and patients diagnosed with factitious disorders. METHODS: One hundred ninety-four psychosomatic medicine inpatients participated. Assessment included the structured World Health Organization Composite International Diagnostic Interview (computerized version) and self-report questionnaires for anxiety, depression, perceived stress, and personal coping resources. RESULTS: Thirty-seven patients identified with self-destructive behavior were matched with 37 patients without such behavior. Overt self-harmers (n = 18) were more frequently diagnosed with anxiety, depressive, substance abuse/dependence, or eating disorders and reported more stress than factitious disorder patients (n = 19) or those without self-destructive behavior. Patients with factitious disorder exhibited lower Axis I comorbidity and less psychopathology than patients without self-harm behavior. CONCLUSIONS: Regarding psychopathologic assessment, contrary to open self-harmers, factitious disorder patients appear strikingly inconspicuous.

The Incidence of Diagnosis of Munchausen Syndrome, Other Factitious Disorders, and Malingering.

BACKGROUND: Systematic studies on factitious disorders and malingering in large populations are rare. To address this issue, we performed a nationwide epidemiological study in Norway on the incidence of these diagnoses in an unselected patient population. In particular, we tried to confirm the diagnoses and to estimate the contribution of Munchausen syndrome to the spectrum of factitious disorders. METHODS: We analyzed data obtained from the Norwegian Patient Registry (NPR), which provided a deidentified list of all patients from 2008 to 2016 who had received the ICD-10 diagnosis of F68.1 or the diagnosis code Z76.5. RESULTS: Altogether, 237 patients (99 females; 138 males) received a diagnosis of F68.1. Code Z76.5 was applied to 52 patients (12 females; 40 males), all diagnosed within health institutions. Three of 1700 specialists (somatic specialist, psychologist, or psychiatrist) in private practice had diagnosed a factitious disorder in altogether 87 patients. After contacting these specialists, we could identify no true case of F68.1. For 24 of 146 patients who were equally distributed by gender within health institutions, we managed to identify the diagnosing healthcare providers. Of these 24 patients, only 11 correctly qualified for code F68.1. Only two female patients qualified for a Munchausen syndrome diagnosis. CONCLUSIONS: There is a male predominance for the diagnosis of malingering. An earlier suspicion of a female predominance for Munchausen syndrome is upheld. There is significant underdiagnosing and misdiagnosing for both conditions and for factitious disorders in general. To separate the most serious form of factitious disorders from milder forms and to facilitate more systematic research, we recommend a specific ICD diagnosis for Munchausen syndrome.