E56.9 ICD-10-CM Code: Vitamin deficiency, unspecified
E56.9 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools
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FY 2026 Apr update / Endocrine, nutritional and metabolic diseases (E00-E89) / Other nutritional deficiencies (E50-E64)
E56.9
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceVitamin deficiency, unspecified
A lack of one or more vitamins when the specific vitamin deficiency cannot be identified or documented.
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
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for E56.9. 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 E56.9. Check the code and parent instructions in the Code Book.
Excludes 1
Official- transitory endocrine and metabolic disorders specific to newborn (P70-P74)Inherited from E00-E89, E56
- sequelae of other vitamin deficiencies (E64.8)Inherited from E00-E89, E56
Code First
OfficialNo Code First sequencing instructions are included in this display for E56.9. Check the code and parent instructions in the Code Book.
Use Additional
OfficialNo Use Additional Code instructions are included in this display for E56.9. Check the code and parent instructions in the Code Book.
Code Also
OfficialNo Code Also instructions are included in this display for E56.9. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
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 E56.9 an HCC code?
No. E56.9 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- E56.9
- Description
- Vitamin deficiency, unspecified
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
E56.9 is the ICD-10-CM diagnosis code for vitamin deficiency, unspecified. A lack of one or more vitamins when the specific vitamin deficiency cannot be identified or documented. E56.9 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering other nutritional deficiencies (e50-e64).
E56.9 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 non-specific code; use only when documentation does not specify which vitamin(s) are deficient.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for E56.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a non-specific code; use only when documentation does not specify which vitamin(s) are deficient
- •Query provider for clarification on which vitamins are involved to assign more specific codes