2026 ICD-10-CM Diagnosis Code F50.00Anorexia nervosa, unspecified
ICD-10-CM Codes›F01–F99›F50-F59›F50
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 153
- Chronic Condition
F50.00 is a billable ICD-10-CM diagnosis code for anorexia nervosa, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 883. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 35 closely related codes. Coders also document this condition as anorexia nervosa. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Feeding and eating disorders.
For Medicare Advantage risk adjustment, F50.00 maps to CMS-HCC Category 153 (Personality Disorders; Anorexia/Bulimia Nervosa) under the V28 model, adding a risk factor of about 0.396 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
F50.00 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2026.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anorexia nervosa
- Anorexia nervosa co-occurrent with dangerously low body weight
- Anorexia nervosa co-occurrent with significantly low body weight
- Anorexia nervosa in remission
- Eating disorder in remission
- Hypertrichosis in anorexia nervosa
- Prepubertal anorexia nervosa
Index to Diseases and InjuriesGuidance
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Anorexia Nervosa
an eating disorder that is characterized by the lack or loss of appetite, known as anorexia. other features include excess fear of becoming overweight; body image disturbance; significant weight loss; refusal to maintain minimal normal weight; and amenorrhea. this disorder occurs most frequently in adolescent females. (apa, thesaurus of psychological index terms, 1994)
Patient EducationClinical
Eating Disorders
Eating disorders are serious mental health disorders. They involve severe problems with your thoughts about food and your eating behaviors. You may eat much less or much more than you need.
The full article covers:
- What are eating disorders?
- What are the types of eating disorders?
- What causes eating disorders?
- Who is at risk for eating disorders?
- What are the symptoms of eating disorders?
- How is eating disorders diagnosed?
- What are the treatments for eating disorders?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert F50.00 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F50.00Overview
What is the ICD-10 code for anorexia nervosa, unspecified?
The ICD-10-CM code for anorexia nervosa, unspecified is F50.00 (sometimes written as F5000). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is F50.00 (Anorexia nervosa) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report anorexia nervosa, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does F50.00 group to?
When anorexia nervosa, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 883 (disorders of Personality and Impulse Control), which carries a relative weight of 1.9663. Higher weights mean higher Medicare reimbursement.
Is F50.00 a CC or MCC?
CMS lists F50.00 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 35 closely related codes in its exclusion list.
What is the ICD-9 equivalent of F50.00?
Under the General Equivalence Mappings, anorexia nervosa, unspecified converts to ICD-9-CM 307.1 (anorexia nervosa). The mapping is approximate, so confirm the match fits the documentation.
What HCC is F50.00?
F50.00 (anorexia nervosa, unspecified) maps to CMS-HCC Category 153 (Personality Disorders; Anorexia/Bulimia Nervosa), commonly written as HCC 153, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. In the Part D prescription drug model it maps to RxHCC 133.
Does F50.00 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, F50.00 adds a risk adjustment factor of about 0.396 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.199 to 0.464 depending on the payment segment). A more severe related category (HCC 151 and HCC 152) supersedes it when both are reported. See the full factor table on the HCC 153 category page.
