Lactose intolerance (E73) ICD-10-CM
The E73 code range covers lactose intolerance with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the E73 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the E73 range.
Lactose Intolerance
The condition resulting from the absence or deficiency of LACTASE in the MUCOSA cells of the GASTROINTESTINAL TRACT, and the inability to break down LACTOSE in milk for ABSORPTION. Bacterial fermentation of the unabsorbed lactose leads to symptoms that range from a mild indigestion (DYSPEPSIA) to severe DIARRHEA. Lactose intolerance may be an inborn error or acquired.
About the E73 Code Range
Lactose intolerance occurs when the digestive tract lacks enough lactase to break down lactose in milk for absorption. It can cause indigestion or diarrhea.
Within metabolic disorders, E73 separates congenital lactase deficiency, present from birth, at E73.0 from secondary lactase deficiency at E73.1. The remaining subdivisions are other lactose intolerance, E73.8, and unspecified lactose intolerance, E73.9.
Questions About This Page
How many billable codes are in the E73 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the E73 range classify?
The range classifies lactose intolerance. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
