F50.9 ICD-10-CM Code: Eating disorder, unspecified
F50.9 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
HCC Buddy Code Card
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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 guidanceEating 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 mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
MappedHCC 133
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Atypical anorexia nervosa
- Atypical bulimia nervosa
- Feeding or eating disorder, unspecified
- Other specified feeding disorder
Excludes 2
Official- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)Inherited from F01-F99, F50
- feeding difficulties (R63.3-)Inherited from F01-F99, F50
- feeding disorder in infancy or childhood (F98.2-)Inherited from F01-F99, F50
Related Codes
Includes
Official- disorders of psychological developmentInherited from F01-F99
Excludes 1
Official- anorexia NOS (R63.0)Inherited from F50
- feeding problems of newborn (P92.-)Inherited from F50
- polyphagia (R63.2)Inherited from F50
Code First
OfficialNo Code First sequencing instructions are included in this display for F50.9. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for F50.9. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for F50.9. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 has no mapping under the current CMS-HCC V28 community payment model. F50.9 has a separate mapping under the Part D RxHCC model (HCC 133 (Anxiety and Other Psychiatric Disorders)); the applicable result needs member context.
- Code
- F50.9
- Description
- Eating disorder, unspecified
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. 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 context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.
Work F50.9 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for F50.9
For F50.9, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- 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
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 has no mapping under the current CMS-HCC V28 community payment model. F50.9 has a separate mapping under the Part D RxHCC model (HCC 133 (Anxiety and Other Psychiatric Disorders)); the applicable result needs member context. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.
This is a default code; attempt to obtain more specific diagnostic information from the provider before assigning this code.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, 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