ICD-10-CM · Chapter 4 · E00-E89

E73 Lactose intolerance

Category / Non-billable header 4 subcodes

Block: Metabolic disorders (E70-E88)

Subcodes

Each subcode links to a detail page with full clinical annotations.

Code	Description	Billable
E73..0	Congenital lactase deficiency	Yes
E73..1	Secondary lactase deficiency	Yes
E73..8	Other lactose intolerance	Yes
E73..9	Lactose intolerance, unspecified	Yes

Last reviewed: September 2026