2027 ICD-10-CM Diagnosis Code F50.9Eating disorder, unspecified
ICD-10-CM Codes›F01–F99›F50-F59›F50
- Billable — Valid for Submission
- Not Chronic
F50.9 is a billable ICD-10-CM diagnosis code for eating disorder, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 887. Coders also document this condition as atypical anorexia nervosa. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Feeding and eating disorders.
F50.9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
F50.9 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 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.
- Atypical anorexia nervosa
- Atypical bulimia nervosa
- Bulimia nervosa
- Eating disorder
- Eating disorder in remission
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to F50.9: its own notes plus those printed at F50 and Chapter 5. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- disorders of psychological development
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Atypical anorexia nervosa
- Atypical bulimia nervosa
- Feeding or eating disorder, unspecified
- Other specified feeding disorder
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name F50.9, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming F50.9: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 2
These codes carry an Excludes2 note naming F50.9: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
psychogenic F50.9
atypical F50.9
normal weight F50.9
Disorder (of) See Also: Disease;
feeding (infant or child) See Also: Disorder, eating; R63.30
or eating disorder F50.9
specified NEC F50.9
psychogenic NOS See Also: condition; F45.9
appetite F50.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Eating Disorder
a broad group of psychological disorders with abnormal eating behaviors leading to physiological effects from overeating or insufficient food intake.
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 F50.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F50.9Overview
What is the ICD-10 code for eating disorder, unspecified?
The ICD-10-CM code for eating disorder, unspecified is F50.9 (sometimes written as F509). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is F50.9 (Eating disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report eating disorder, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does F50.9 group to?
When eating disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 887 (other Mental Disorder Diagnoses), which carries a relative weight of 1.1154. Higher weights mean higher Medicare reimbursement.
Can F50.9 be reported with R63.0?
Not as a rule. The Excludes1 note at F50, which applies to F50.9, lists "anorexia NOS (R63.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of F50.9?
Under the General Equivalence Mappings, eating disorder, unspecified converts to ICD-9-CM 307.50 (eating disorder NOS). The mapping is a direct match.
Does F50.9 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: F50.9 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 133 (Anxiety and Other Psychiatric Disorders).
