2026 ICD-10-CM Diagnosis Code E73Lactose intolerance

ICD-10-CM Codes›E00–E89›E70-E88›E73

ICD-10-CM E73
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

E73 is a non-billable ICD-10-CM category code for lactose intolerance, so it cannot be submitted on claims. Use a more specific code from this category instead, such as E73.0, E73.1, E73.8, and E73.9.

Code Identity

ICD-10-CM Code
E73
Billable Status
No — Non-Billable Category
Code Describes
Lactose intolerance
Chapter
E70-E88
Metabolic disorders

Code Classification

ChapterE00–E89Endocrine, nutritional and metabolic diseases
SectionE70-E88Metabolic disorders
CategoryE73Lactose intolerance
This CodeE73Lactose intolerance

Specific Coding for Lactose intoleranceOverview

Non-specific codes like E73 require more characters. Use one of these billable codes instead:

  • Use E73.0 for Congenital lactase deficiency

  • Use E73.1 for Secondary lactase deficiency

  • Use E73.8 for Other lactose intolerance

  • Use E73.9 for Lactose intolerance, unspecified

Clinical InformationClinical

  • 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.

Patient EducationClinical

Lactose Intolerance

Lactose intolerance means that you cannot digest foods with lactose in them. Lactose is the sugar found in milk and foods made with milk. After eating foods with lactose in them, you may feel sick to your stomach. You may also have:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About E73Overview

Is E73 (Lactose intolerance) a billable code?

No. This is a category header that groups the codes for lactose intolerance, and headers cannot be submitted on claims. Claims for lactose intolerance need a more specific code from this category, such as E73.0, E73.1, and E73.8.