E73: Lactose intolerance
Codes under E73 (Lactose intolerance). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| E73.0 | Congenital lactase deficiency | ✓ |
| E73.0 | Congenital lactase deficiency | ✓ |
| E73.1 | Secondary lactase deficiency | ✓ |
| E73.1 | Secondary lactase deficiency | ✓ |
| E73.8 | Other lactose intolerance | ✓ |
| E73.8 | Other lactose intolerance | ✓ |
| E73.9 | Lactose intolerance, unspecified | ✓ |
| E73.9 | Lactose intolerance, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code E73?
E73 is an ICD-10-CM category covering Lactose intolerance. It contains 8 more specific diagnosis codes, 8 of which are billable.
Is E73 a billable code?
No — E73 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example E73.0 — Congenital lactase deficiency). 8 of the 8 codes under E73 are billable.
What codes fall under E73?
E73 includes E73.0, E73.0, E73.1, E73.1, E73.8, plus 3 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free