E73.9 Lactose intolerance, unspecified

The ICD-10-CM code for Lactose intolerance, unspecified is E73.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

E70-E88: Metabolic disorders (E70-E88)

Category E73

5 codes (4 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to E73.9:

• Deficiency, deficient › disaccharidase
• Malabsorption › disaccharide
• Intolerance › lactose
• Malabsorption › lactose
• Intolerance › milk NEC › lactose

U.S. Hospital Utilization

• An estimated 21,970 U.S. inpatient stays in 2023 included E73.9 among the documented diagnoses.

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)

Cite This Page

Reference E73.9 with the canonical source and edition:

E73.9 — Lactose intolerance, unspecified. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/E73.9

Canonical URL: https://icd10codingpro.com/codes/E73.9