ICD-10 Code for Narcolepsy
The ICD-10-CM code for narcolepsy is G47.419 — Narcolepsy without cataplexy. This is the code the Alphabetic Index gives for narcolepsy with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
Billable
Which narcolepsy code should you use?
The Alphabetic Index lists 4 codes under Narcolepsy. 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.
By type
Narcolepsy in conditions classified elsewhere
| with cataplexy | G47.421 | Narcolepsy in conditions classified elsewhere with cataplexy |
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