ICD-10-CM 2027
ICD-10 code for Narcolepsy
From the official ICD-10-CM alphabetic index entry “Narcolepsy”. Page updated September 29, 2026.
About coding Narcolepsy
The ICD-10-CM code for Narcolepsy is G47.419 (Narcolepsy without cataplexy). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on G47.419.
Within G47.41, choose G47.419 (without cataplexy) only when documentation doesn't support a more specific option: with cataplexy (G47.411).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 091 (Other Disorders of Nervous System with MCC, relative weight 1.7046), DRG 092 (Other Disorders of Nervous System with CC, relative weight 1.0239) and DRG 093 (Other Disorders of Nervous System without CC/MCC, relative weight 0.7783), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Narcolepsy codes (official index)
Common questions about Narcolepsy ICD-10 codes
What is the ICD-10 code for Narcolepsy?
- G47.419 — Narcolepsy without cataplexy. More specific codes apply when the documentation supports them: G47.411, G47.429, G47.421.
Is G47.419 billable?
- Yes. G47.419 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G47.419 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G47.419 as a principal diagnosis.
Is G47.419 a CC or MCC?
- No. G47.419 is neither a CC nor an MCC under MS-DRG v44.0.