What is ICD-10 code F50.00?

F50.00 is the ICD-10-CM diagnosis code for Anorexia nervosa, unspecified. An eating disorder characterized by severe restriction of food intake and an intense fear of gaining weight, but the specific type or severity level is not documented. F50.00 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F50.00 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. F50.00 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. F50.00 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for F50.00?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. F50.00 is a payment HCC under V28 (Personality Disorders; Anorexia/Bulimia Nervosa) but was not retained as a payment HCC under V24. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting F50.00?

This is an unspecified code; attempt to determine if the patient has restricting type or binge eating/purging type before coding If severity level is documented (mild, moderate, severe, extreme, or in remission), use the more specific subcode instead Because F50.00 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

2026 ICD-10-CM F50.00: Anorexia nervosa

ICD-10-CM Code View

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Code lookupF50.00Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59)

F50.00

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Anorexia nervosa, unspecified

An eating disorder characterized by severe restriction of food intake and an intense fear of gaining weight, but the specific type or severity level is not documented.

Buddy Insight

Anorexia nervosa is a life-threatening eating disorder with the highest mortality rate of any psychiatric illness.

CMS-HCC V28

Mapped

HCC 153

Personality Disorders; Anorex...

RAF 0.396

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

Mapped

HCC 94

HHS-HCC 94

Varies by metal level

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

Mapped

HCC 133

Personality Disorders, Anxiet...

RAF 0.035

Code Book Path

Official

F50Eating disorders

F50.0Anorexia nervosa

F50.00Anorexia nervosa, unspecified

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for F50.00 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for F50.00 in this effective period.

Related Child Codes

Official

F50.01Anorexia nervosa, restricting type

F50.02Anorexia nervosa, binge eating/purging type

Includes

Official

ICD-10-CM does not list Includes notes for F50.00 in this effective period.

Excludes 1

Official

loss of appetite (R63.0)
psychogenic loss of appetite (F50.89)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F50.00 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F50.00 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F50.00 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of restriction of energy intake leading to significantly low body weight

Intense fear of gaining weight or persistent behavior interfering with weight gain

Disturbance in body weight/shape perception or undue influence of body weight on self-evaluation

Current BMI or weight status relative to expected range

MEAT Support

HCC Buddy guidance

Documentation of restriction of energy intake leading to significantly low body weight

Intense fear of gaining weight or persistent behavior interfering with weight gain

Disturbance in body weight/shape perception or undue influence of body weight on self-evaluation

Current BMI or weight status relative to expected range

Audit Caution

HCC Buddy guidance

Using F50.00 when type and severity are documented — always code to the highest specificity available

Confusing R63.0 (medical anorexia/loss of appetite) with F50.00 (anorexia nervosa the psychiatric illness) — completely different conditions

Not capturing severity and type when documented, leaving value on the table by using the unspecified code

Failing to code associated medical complications (electrolyte imbalance, amenorrhea, osteoporosis) as additional diagnoses

Common Mistakes

HCC Buddy guidance

F50.01x (Anorexia nervosa, restricting type) — use when restricting subtype with severity is documented

F50.02x (Anorexia nervosa, binge eating/purging type) — use when binge/purge behaviors are documented

R63.0 (Anorexia) — medical anorexia (loss of appetite), NOT the psychiatric eating disorder

F50.89 (Other specified eating disorder) — use for atypical anorexia nervosa (normal weight but all other criteria met)

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is F50.00 an HCC code?

Yes. F50.00 (Anorexia nervosa, unspecified) maps to Personality Disorders; Anorexia/Bulimia Nervosa under the CMS-HCC V28 risk adjustment model, with a community non-dual aged RAF of 0.396. It is billable for payment year 2026.

Coder answer: F50.00 is billable and maps to V28 HCC 153, Personality Disorders; Anorexia/Bulimia Nervosa. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: F50.00
Description: Anorexia nervosa, unspecified
HCC (V28): HCC 153 — Personality Disorders; Anorexia/Bulimia Nervosa
RAF: 0.396
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 153, Personality Disorders; Anorexia/Bulimia Nervosa

0.396

RxHCCHCC 133, Personality Disorders, Anxiety, and Other Specified Mental Disorders

0.035

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work F50.00 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F50.00

For F50.00 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed F50.00 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F50.00 is the ICD-10-CM diagnosis code for anorexia nervosa, unspecified. An eating disorder characterized by severe restriction of food intake and an intense fear of gaining weight, but the specific type or severity level is not documented. F50.00 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering behavioral syndromes associated with physiological disturbances and physical factors (f50-f59).

Under the CMS-HCC V28 risk adjustment model, F50.00 maps to Personality Disorders; Anorexia/Bulimia Nervosa (HCC 153) with a community, non-dual, aged base RAF weight of 0.396. F50.00 was not retained as a payment HCC under the older V24 model, so V28 introduced or recategorized it during the 2024–2026 phase-in. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

This is an unspecified code; attempt to determine if the patient has restricting type or binge eating/purging type before coding. Because F50.00 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F50.00 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This is an unspecified code; attempt to determine if the patient has restricting type or binge eating/purging type before coding
•If severity level is documented (mild, moderate, severe, extreme, or in remission), use the more specific subcode instead

Clinical Significance

Anorexia nervosa is a life-threatening eating disorder with the highest mortality rate of any psychiatric illness. The unspecified code indicates the provider has diagnosed anorexia nervosa but has not specified the type (restricting vs. binge eating/purging) or severity. This condition requires intensive medical monitoring due to serious cardiac, metabolic, and endocrine complications.

Documentation Requirements

✓Documentation of restriction of energy intake leading to significantly low body weight
✓Intense fear of gaining weight or persistent behavior interfering with weight gain
✓Disturbance in body weight/shape perception or undue influence of body weight on self-evaluation
✓Current BMI or weight status relative to expected range
✓Medical complications screening (electrolyte abnormalities, cardiac status, bone density)

Commonly Confused Codes

•F50.01x (Anorexia nervosa, restricting type): use when restricting subtype with severity is documented
•F50.02x (Anorexia nervosa, binge eating/purging type): use when binge/purge behaviors are documented
•R63.0 (Anorexia): medical anorexia (loss of appetite), NOT the psychiatric eating disorder
•F50.89 (Other specified eating disorder): use for atypical anorexia nervosa (normal weight but all other criteria met)
•F50.9 (Eating disorder, unspecified): even more nonspecific; use F50.00 when anorexia nervosa is specifically diagnosed