What is ICD-10 code F50.9?

F50.9 is the ICD-10-CM diagnosis code for Eating disorder, unspecified. An eating disorder that is present but cannot be classified into a specific type, often used when insufficient information is available to determine the exact diagnosis. F50.9 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. F50.9 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. F50.9 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. F50.9 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 F50.9?

F50.9 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither community model rewards F50.9 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. It does, however, map under the Part D RxHCC model (Personality Disorders, Anxiety, and Other Specified Mental Disorders), which affects the ESRD and/or Part D (RxHCC) risk scores. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

What should coders know when reporting F50.9?

This is a default code; attempt to obtain more specific diagnostic information from the provider before assigning this code Query the clinician if any eating disorder symptoms are documented but not formally diagnosed to allow for more specific coding

2026 ICD-10-CM F50.9: Eating disorder, unspecified

ICD-10-CM Code View

HCC Buddy Code Card

Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupF50.9Effective 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)

F50.9

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

Eating disorder, unspecified

An eating disorder that is present but cannot be classified into a specific type, often used when insufficient information is available to determine the exact diagnosis.

Buddy Insight

This unspecified code indicates the presence of an eating disorder without sufficient documentation to classify the specific type.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

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

F50.9Eating disorder, unspecified

Inclusion Terms

Official

Atypical anorexia nervosa
Atypical bulimia nervosa
Feeding or eating disorder, unspecified
Other specified feeding disorder

Excludes 2

Official

feeding difficulties (R63.3-)
feeding disorder in infancy or childhood (F98.2-)

Related Child Codes

Official

F50.0Anorexia nervosa

F50.2Bulimia nervosa

F50.8Other eating disorders

Includes

Official

ICD-10-CM does not list Includes notes for F50.9 in this effective period.

Excludes 1

Official

anorexia NOS (R63.0)
feeding problems of newborn (P92.-)
polyphagia (R63.2)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for F50.9 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for F50.9 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for F50.9 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of disordered eating behavior causing clinical concern

Evidence that symptoms represent a psychiatric eating disorder, not a medical appetite condition

Provider acknowledgment of an eating disorder diagnosis

Any available detail on the type of disordered eating to enable specificity

MEAT Support

HCC Buddy guidance

Documentation of disordered eating behavior causing clinical concern

Evidence that symptoms represent a psychiatric eating disorder, not a medical appetite condition

Provider acknowledgment of an eating disorder diagnosis

Any available detail on the type of disordered eating to enable specificity

Audit Caution

HCC Buddy guidance

Using F50.9 when any more specific eating disorder diagnosis is documented — always pursue maximum specificity

Missing the significant RAF value difference: anorexia nervosa and bulimia nervosa map to V28 HCC 153 (RAF 1.241) while F50.9 does not

Not querying the provider when clinical documentation suggests a specific eating disorder type

Confusing R63.0 (loss of appetite) with F50.9 (eating disorder) — these are fundamentally different conditions

Common Mistakes

HCC Buddy guidance

F50.00 (Anorexia nervosa, unspecified) — use when anorexia nervosa is diagnosed, even without type/severity specified

F50.20 (Bulimia nervosa, unspecified) — use when bulimia is diagnosed, even without severity specified

F50.819 (Binge eating disorder, unspecified) — use when binge eating disorder is diagnosed without severity

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

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 F50.9 an HCC code?

F50.9 is not in the CMS-HCC V28 or V24 community payment model, but it does map to Personality Disorders, Anxiety, and Other Specified Mental Disorders under the Part D RxHCC model.

Code: F50.9
Description: Eating disorder, unspecified
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

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 F50.9 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for F50.9

For F50.9 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 F50.9 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

F50.9 is the ICD-10-CM diagnosis code for eating disorder, unspecified. An eating disorder that is present but cannot be classified into a specific type, often used when insufficient information is available to determine the exact diagnosis. F50.9 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).

F50.9 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This code does not map to a CMS-HCC V28 payment category. Capture depends on documentation that supports the diagnosis; verify the HCC assignment against the current CMS mapping for the applicable payment year. Coders reviewing F50.9 should check whether additional documentation would support a more specific child code in the same hierarchy that does map to a payment HCC, capturing the correct specificity is the highest-impact RAF improvement available within accurate coding.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F50.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This is a default code; attempt to obtain more specific diagnostic information from the provider before assigning this code
•Query the clinician if any eating disorder symptoms are documented but not formally diagnosed to allow for more specific coding

Clinical Significance

This unspecified code indicates the presence of an eating disorder without sufficient documentation to classify the specific type. It represents a significant missed opportunity for clinical accuracy and potentially for risk adjustment. Coders should query providers to determine the specific eating disorder type, as some types (anorexia nervosa, bulimia nervosa) carry substantially higher HCC values.

Documentation Requirements

✓Documentation of disordered eating behavior causing clinical concern
✓Evidence that symptoms represent a psychiatric eating disorder, not a medical appetite condition
✓Provider acknowledgment of an eating disorder diagnosis
✓Any available detail on the type of disordered eating to enable specificity
✓Recommendation for psychiatric or eating disorder specialist evaluation if type is undetermined

Commonly Confused Codes

•F50.00 (Anorexia nervosa, unspecified): use when anorexia nervosa is diagnosed, even without type/severity specified
•F50.20 (Bulimia nervosa, unspecified): use when bulimia is diagnosed, even without severity specified
•F50.819 (Binge eating disorder, unspecified): use when binge eating disorder is diagnosed without severity
•R63.0 (Anorexia): medical loss of appetite, NOT a psychiatric eating disorder
•F50.89 (Other specified eating disorder): use when a specific variant IS identified but lacks a unique code