ICD-10 Code E73.8 – Other lactose intolerance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E73.8 – Other lactose intolerance
What it is
E73.8 identifies lactose intolerance that does not fit the more specific ICD-10 categories. Use it when the record shows lactose-related intolerance, but the exact type is not otherwise specified.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include abdominal bloating, gas, cramping, and diarrhea after lactose intake, with improvement when lactose is avoided.
When to use this code
Use this code when the clinician documents “other lactose intolerance” or a lactose intolerance type that is not named elsewhere in the chart. It is also appropriate when the record supports lactose intolerance, but does not specify a more exact ICD-10 option. Check documentation if the cause is unclear.
Do not use for
Do not use E73.8 for congenital lactase deficiency or other clearly specified lactose intolerance categories. Do not assign it when the chart only mentions nonspecific abdominal symptoms without a documented lactose intolerance diagnosis.
Coding tip
Code the most specific lactose intolerance diagnosis documented, and use E73.8 only when the record supports “other” or unspecified subtyping.