Atypical Anorexia Is F50.9 (No V28 Map). F50.81 Is Binge Eating. AN/BN Map to HCC 153.

If you searched atypical anorexia nervosa next to F50.81, F50.89, or HCC, you are looking at one of the most common eating-disorder leftovers under CMS-HCC V28 for payment year 2026. F50.81 is not atypical anorexia. On the live FY2026 card it is the non-billable header for binge eating disorder. Billable children such as F50.810 (mild) and F50.819 (unspecified) are verified no payable CMS-HCC V28 mapping.

Official FY2026 Index routing for atypical anorexia nervosa (Anorexia > nervosa > atypical) lands on F50.9 (Eating disorder, unspecified). The tabular list for F50.9 includes atypical anorexia nervosa. That code is billable and has no PY2026 V28 payment map. Look up the F50.9 card.

F50.89 remains a real leftover for other specified eating disorder, psychogenic loss of appetite, and eating disorder specified NEC. It is also no V28 map. It is not the official or usual home for atypical anorexia nervosa. F50.82 (ARFID), F50.83, and F50.84 likewise show no payable V28 mapping on the live cards.

The eating-disorder types that do map under community V28 are anorexia nervosa and bulimia nervosa. F50.00 (Anorexia nervosa, unspecified) maps to V28 HCC 153 (Personality Disorders; Anorexia/Bulimia Nervosa) with a source-labeled community non-dual aged (CNA) reference of 0.396. Restricting and binge-eating/purging anorexia codes such as F50.010 and F50.019 also map to HCC 153. Bulimia nervosa codes such as F50.20 and F50.21 map to the same HCC.

This page is the leftover-style F50.9 / F50.81 / F50.89 atypical anorexia map desk for that leak. It is not a rewrite of the F32.9 depression leftover desk, the behavioral health HCC guide, or the depression HCC coding guide.

Desk table: verified maps and no-maps (2026-09-22)

Coefficients are source-labeled CNA references from the live cards and the HCC 153 hub. Not member totals. Hierarchy still applies: HCC 153 is superseded by HCC 151 and HCC 152 when a more severe category in the same disease group is also present. Mapped anorexia / bulimia payment rows above carry CSV age-edit pairs `age >= 2` and `age < 2` (both present for each mapped code in the PY2026 file).

What F50.81 is (and is not)

F50.81 is the FY2026 non-billable header for binge eating disorder. It is not atypical anorexia nervosa. Do not report the header on claims. Choose the billable child that matches documentation, such as mild (F50.810) or unspecified (F50.819).

Billable does not mean risk-adjusted. Under PY2026 community V28 payment, the F50.81x binge-eating children have no payment HCC. Do not invent a V24 map for current-year non-PACE scoring. Select the historical period on the live card if you need older model context.

Some of these codes may still show a Part D RxHCC category (for example RxHCC 133) with member context. That is not a CMS-HCC V28 community payment map. Keep the models separate.

Where atypical anorexia lands now (official FY2026 home)

When the provider documents atypical anorexia nervosa, the official FY2026 Index home is F50.9. Tabular F50.9 includes atypical anorexia nervosa. That code is billable. It still has no PY2026 V28 payment row. Look up the F50.9 card.

When the chart supports other specified eating disorder, psychogenic loss of appetite, or eating disorder specified NEC (not atypical anorexia), use F50.89. That leftover is also billable with no V28 payment row. Do not treat F50.89 as the expected home for atypical anorexia nervosa.

Leaving a vague "eating disorder" label on F50.9 also does not create payment. ARFID (F50.82), adult pica (F50.83), and adult rumination (F50.84) are likewise not mapped under community V28 in the live cards and the PY2026 CSV.

When anorexia nervosa or bulimia change the map

If the provider documents anorexia nervosa, use the F50.00 / F50.01x / F50.02x family that matches type (example: F50.00, F50.010, F50.019). Those map to HCC 153 (CNA 0.396).

If the chart supports bulimia nervosa, use F50.20 through F50.25 as documented (example: F50.20, F50.21). Those also map to HCC 153.

Pick the path from the documentation:

1. Chart says "atypical anorexia nervosa" -> expect F50.9 (official FY2026 home), no V28 payment map. Query when findings support true anorexia nervosa or bulimia nervosa.

2. Chart supports other specified eating disorder / psychogenic loss of appetite / specified NEC (not atypical anorexia) -> expect F50.89, no V28 payment map.

3. Chart supports binge eating disorder only -> expect billable F50.81x children such as F50.810 or F50.819, no V28 payment map. Do not code F50.81 as atypical anorexia.

4. Chart is only "eating disorder" without further specificity -> expect F50.9, still no V28 payment map.

5. Chart supports anorexia nervosa (restricting or binge-eating/purging type as documented) -> F50.00 / F50.01x / F50.02x -> HCC 153 (CNA 0.396).

6. Chart supports bulimia nervosa -> F50.20-F50.25 -> HCC 153.

7. Do not invent anorexia nervosa or bulimia for RAF. Query when findings support it.

Atypical anorexia is a clinical label with an official ICD-10 home at F50.9 under FY2026 Index/tabular rules. It does not equal the anorexia nervosa ICD-10 family that maps to HCC 153. Code the diagnosis the provider documents, then look the exact code up.

MEAT for HCC 153 capture

A mapped code still needs monitoring, evaluation, assessment, or treatment in the eligible encounter year. A problem-list row that says "anorexia" or "bulimia" from last year does not carry HCC 153 forward by itself.

For F50.00 / F50.01x / F50.02x and F50.20-F50.25 (HCC 153), the note should support:

• M Monitor: weight trend, intake pattern, purging or restricting behaviors when relevant, safety concerns
• E Evaluate: labs, vital signs, screening tools, specialist notes, response to prior plan
• A Assess: explicit anorexia nervosa or bulimia nervosa (type as documented) in the assessment, not only "eating disorder" or "atypical anorexia"
• T Treat: nutrition plan, therapy referral, medication plan, higher level of care, follow-up interval when documented

MEAT is a review mnemonic, not a universal CMS coding rule. Follow the applicable coding, encounter, program, and payer requirements. See MEAT and problem lists.

Audit and query traps

1. Searching "atypical anorexia" and coding F50.81 because the digits look familiar. F50.81 is binge eating now (header).

2. Leaving supported anorexia nervosa on F50.89 / F50.9 and expecting an HCC because "eating disorders are behavioral."

3. Treating F50.9 (atypical anorexia) or F50.89 (other-specified / psychogenic / specified NEC) as if they mapped like F50.00. Neither maps under V28.

4. Sending atypical anorexia to F50.89 as if that were the official or usual home. FY2026 Index/tabular home is F50.9.

5. Inventing anorexia nervosa or bulimia from a vague "eating disorder" or "atypical anorexia" note without provider confirmation.

6. Reporting the F50.81 header on a claim (non-billable).

7. Confusing Part D RxHCC mapping with CMS-HCC V28 community payment.

8. Skipping MEAT for a historical anorexia / bulimia label with no current assessment or treatment.

9. Ignoring hierarchy: when HCC 151 or HCC 152 also applies in the same disease group, HCC 153 can be superseded.

10. Mixing depression leftover logic into this desk. Cross-link the F32.9 depression leftover desk when mood codes are the issue.

11. Rewriting this trap into the behavioral-health or depression overview posts. Cross-link those; keep this F50.9 / F50.81 / F50.89 map walk here.

Two-minute check

1. Is the documentation atypical anorexia nervosa? Expect F50.9 (official FY2026 home), no V28 payment map.

2. Is it other specified / psychogenic loss of appetite / specified NEC (not atypical anorexia)? Expect F50.89, no V28 payment map.

3. Is it binge eating disorder? Expect billable F50.81x children such as F50.810 or F50.819 (not the header alone), still no V28 payment map.

4. Unspecified eating disorder only? Expect F50.9, still no V28 payment map.

5. Anorexia nervosa with type documented? Expect F50.00 / F50.01x / F50.02x -> HCC 153 (CNA 0.396).

6. Bulimia nervosa? Expect F50.20-F50.25 -> HCC 153.

7. MEAT this year. Look the exact code up on its card or /icd10-to-hcc.

Related

• F50.9 card
• F50.81 card
• F50.810 card
• F50.89 card
• F50.82 card
• F50.00 card
• F50.010 card
• F50.20 card
• HCC 153 hub
• F32.9 depression leftover desk
• Behavioral health HCC codes V28
• Depression HCC coding guide
• ICD-10 to HCC
• V28 hub
• MEAT
• Encoder

Disclaimer

By the HCC Buddy Coding Team. V28 mappings from the cited live code pages, the HCC 153 hub, and `ICD10_CC_mappings_CMS_HCC_2026_v28.csv`, current as of September 22, 2026. Coefficients are source-labeled references, not member totals. Not medical advice. Do not code from this recap. Not a Coding Clinic reprint. Not a rewrite of the F32.9 depression leftover desk, behavioral-health-hcc-codes-v28, depression-hcc-coding-guide, I73.9 PAD desk, I70.209, ulcer desk, I25.10 CAD, I10-I13, E13, E66.2, E11-*, L12.0, the V28 PDF list desk, or D59.31.