ICD-10 Code for Horton's headache or neuralgia
The ICD-10-CM code for horton's headache or neuralgia is G44.099 — Other trigeminal autonomic cephalgias (TAC), not intractable. This is the code the Alphabetic Index gives for horton's headache or neuralgia with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
Which horton's headache or neuralgia code should you use?
The Alphabetic Index lists 2 codes under Horton's headache or neuralgia. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources