E55.9 — Vitamin D deficiency, unspecified
E55.9 is a billable, specific ICD-10-CM code for vitamin d deficiency, unspecified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Avitaminosis D
Risk adjustment
E55.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
E55.9 is named in 11 Medicare coverage policies — 11 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56416Billing and Coding: Assays for Vitamins and Metabolic Function
- A56798Billing and Coding: Vitamin D Assay Testing
- A56841Billing and Coding: Vitamin D; 25 hydroxy, includes fraction(s), if performed
- A57484Billing and Coding: Vitamin D Assay Testing
How E55.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to E55.9.
- Calciferol deficiency(vitamin D)
- Ergosterol deficiency(vitamin D)
- Avitaminosis›D
- Deficiency, deficient›calciferol
- Deficiency, deficient›ergosterol
- Deficiency, deficient›vitamin NOS›D
Related codes at this level
Codes that share E55. If E55.9 is not quite right, the correct code is usually one of these.
Questions about E55.9
- Is E55.9 a billable ICD-10-CM code?
- Yes. E55.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does E55.9 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Other nutritional deficiencies (E50-E64).