E73.9 is the authoritative medical code for Lactose intolerance, unspecified. This classification is used in medical billing and clinical recording to specify the clinical criteria for lactose intolerance, unspecified (ICD-10-CM E73.9), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Sequencing, inclusion, and exclusion notes published for E73.9 in the official ICD-10-CM tabular list.
Conditions that can never be reported with this code; the two are mutually exclusive.
Conditions not covered by this code, but which may be reported alongside it when both are present.
Per Excludes1 instructions, E73.9 must not be reported with: androgen insensitivity syndrome (E34.5-); congenital adrenal hyperplasia (E25.0); hemolytic anemias attributable to enzyme disorders (D55.-); Marfan syndrome (Q87.4-).
Per Excludes2 instructions, E73.9 and the following may both be reported when both are present: Ehlers-Danlos syndromes (Q79.6-).
Official ICD-10-CM classifications in the same code family as E73.9, with their registry titles.
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: