Absorption is a main term in the FY2027 ICD-10-CM Alphabetic Index (Index to Diseases and Injuries). It has 23 subterms and 16 code entries. First-level subterms include carbohydrate, disturbance, chemical, drug NEC, fat, disturbance, noxious substance, protein, disturbance, starch, disturbance, toxic substance and more. Confirm any code you find here in the Tabular List before you report it.