E55.9 — Vitamin D deficiency, unspecified

E55.9

ICD-10 Chapter 4: Endocrine, Nutritional & Metabolic — illustrative image — Chapter 4: Endocrine, nutritional and metabolic diseases (E00–E89) — illustrative image

What this code means

Vitamin D deficiency means too little vitamin D, important for bones, muscles and immune function.

Also called: vitamin d deficiency, low vitamin d.

When this code is used

Used for vitamin D deficiency when the type is not specified.

Where it sits in ICD-10-CM

Code E55.9 belongs to Chapter 4: Endocrine, nutritional and metabolic diseases, which covers codes E00–E89 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

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Frequently asked questions

What is ICD-10-CM code E55.9?

E55.9 is the ICD-10-CM diagnosis code for “Vitamin D deficiency, unspecified”. Vitamin D deficiency means too little vitamin D, important for bones, muscles and immune function.

When is code E55.9 used?

Used for vitamin D deficiency when the type is not specified. It belongs to Chapter 4 of ICD-10-CM (Endocrine, nutritional and metabolic diseases).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.