E55.9 Vitamin D deficiency, unspecified

The ICD-10-CM code for Vitamin D deficiency, unspecified is E55.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

4: Endocrine, nutritional and metabolic diseases (E00-E89)

Section

E50-E64: Other nutritional deficiencies (E50-E64)

Category E55

3 codes (2 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to E55.9:

• Ergosterol deficiency (vitamin D)
• Calciferol (vitamin D) deficiency
• Deficiency, deficient › ergosterol
• Deficiency, deficient › calciferol
• Avitaminosis (multiple) › D
• Deficiency, deficient › vitamin (multiple) NOS › D

Inclusion Terms

• Avitaminosis D

U.S. Hospital Utilization

• An estimated 572,880 U.S. inpatient stays in 2023 included E55.9 among the documented diagnoses.
• 420 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Diabetes mellitus (TOC entry)

a. Diabetes mellitus ................................................................................................................... 39

Obesity (TOC entry)

b. Obesity .................................................................................................................................. 42

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)