USE THIS to get the OFFICIAL description of an ICD-10-CM diagnosis code instead of recalling it — models confidently misstate the specifics (laterality, severity, encounter type) and invent descriptions for codes that don't exist. Returns the official description, the canonical dotted form, and its 3-character category; if the code is well-formed but not in the dataset it says so rather than guessing. Accepts codes with or without the dot (E11.9 or E119).

USE THIS to check whether an ICD-10-CM code is real before relying on it — never assume a plausible-looking code exists. Returns whether it is well-formed AND present in the official code set, plus the description when valid. Catches fabricated or retired codes a model would otherwise accept.

USE THIS to find the ICD-10-CM code for a condition (reverse lookup) instead of guessing the code — e.g. 'type 2 diabetes' or 'generalized anxiety'. Returns official codes whose description contains all your search words, shortest (most general) first.