Is ICD-10-CM code E73 billable?

No, E73 (Lactose intolerance) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code E73 belong to?

E73 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E73Non-billable

Lactose intolerance

Endocrine, Nutritional and Metabolic Diseases·Metabolic disorders (E70-E88)·category·FY 2026

Use a more specific code (4 billable)

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

CH4 Parent Instructions

Excludes1(Not coded here. Use a different code.)

transitory endocrine and metabolic disorders specific to newborn (P70-P74)

E70-E88 Parent Instructions

Excludes1(Not coded here. Use a different code.)

androgen insensitivity syndrome (E34.5-)
congenital adrenal hyperplasia (E25.0)
hemolytic anemias attributable to enzyme disorders (D55.-)
Marfan syndrome (Q87.4-)
5-alpha-reductase deficiency (E29.1)

Excludes2(Not included here. Code separately if applicable.)

Ehlers-Danlos syndromes (Q79.6-)

Clinical Hierarchy

BillableHas subcodes

CH4Endocrine, nutritional and metabolic diseases (E00-E89)

E70-E88Metabolic disorders (E70-E88)

E73Lactose intoleranceNot billable

E73.0Congenital lactase deficiencyBillable

E73.1Secondary lactase deficiencyBillable

E73.8Other lactose intoleranceBillable

E73.9Lactose intolerance, unspecifiedBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.