E51 ICD-10-CM Code: Thiamine deficiency
E51 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Other nutritional deficiencies (E50-E64)
E51
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceThiamine deficiency
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for E51. Check the code and parent instructions in the Code Book.
Excludes 2
Official- nutritional anemias (D50-D53)Inherited from E50-E64
Related Codes
Includes
OfficialNo Includes notes are included in this display for E51. Check the code and parent instructions in the Code Book.
Excludes 1
Official- sequelae of thiamine deficiency (E64.8)
- transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89
Code First
OfficialNo Code First sequencing instructions are included in this display for E51. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for E51. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for E51. Check the code and parent instructions in the Code Book.
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 →
- Code
- E51
- Description
- Thiamine deficiency
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
E51 is the ICD-10-CM diagnosis code for thiamine deficiency. E51 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering other nutritional deficiencies (e50-e64).
Header codes like E51 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for E51 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Excludes 1, Do NOT code together
- sequelae of thiamine deficiency (E64.8)