Question 1

What is ICD-10 code E51.2?

Accepted Answer

E51.2 is the ICD-10-CM diagnosis code for wernicke's encephalopathy. Wernicke's encephalopathy is a serious brain condition caused by severe thiamine deficiency, characterized by confusion, eye movement problems, and loss of coordination. E51.2 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering other nutritional deficiencies (e50-e64).

E51.2 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

This is a medical emergency; code with appropriate severity indicators.

Question 2

Is E51.2 an HCC code?

Accepted Answer

E51.2 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 3

Is E51.2 billable?

Accepted Answer

Yes. E51.2 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. E51.2 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.

Question 4

Which HCC does E51.2 map to under V28?

Accepted Answer

E51.2 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

Question 5

What RAF reference is published for E51.2?

Accepted Answer

E51.2 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

Question 6

What is the V28 vs V24 difference for E51.2?

Accepted Answer

E51.2 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

Question 7

What documentation supports E51.2?

Accepted Answer

This is a medical emergency; code with appropriate severity indicators Often associated with chronic alcohol use; consider coding alcohol-related disorders concurrently E51.2 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

Question 8

Can E51.2 be a primary diagnosis?

Accepted Answer

Yes. E51.2 carries no code-first instruction in the FY2026 tabular, so it can be the first-listed diagnosis when it is the condition chiefly responsible for the encounter and the note supports it, and it can also be reported as a secondary diagnosis. For risk adjustment the order does not matter; the V28 category is the same either way.

Question 9

Which codes cannot be reported with E51.2?

Accepted Answer

The Excludes1 note that applies to E51.2 lists transitory endocrine and metabolic disorders specific to newborn (P70-P74); sequelae of thiamine deficiency (E64.8). An Excludes1 condition is not reported together with E51.2; report one or the other, unless the two conditions are unrelated, which the ICD-10-CM Official Guidelines (Section I.A.12.a) allow. The Excludes2 note lists nutritional anemias (D50-D53); those are separate conditions that may be reported together with E51.2 when both are documented.

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E51.2

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E51.2 ICD-10-CM Code: Wernicke's encephalopathy

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E51.2

Is E51.2 an HCC code?

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What This Code Means

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Work E51.2 in HCC Buddy