ICD-10-CM 2027 diagnosis code
G47.419Narcolepsy without cataplexy
G47.419 is a valid, billable ICD-10-CM code for narcolepsy without cataplexy. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Narcolepsy, ICD-10 code for Gélineau's syndrome.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About G47.419
G47.419 is the ICD-10-CM diagnosis code for Narcolepsy without cataplexy. It belongs to category G47 (sleep disorders), block G40-G47 (episodic and paroxysmal disorders) and chapter 6 (diseases of the nervous system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
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.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 347.00 (Narcolepsy, without cataplexy).
Coding notes
- Narcolepsy NOS
Notes that apply from higher levels
Instructions written at a parent level also apply to G47.419.
› From G47 Sleep disorders
Broader instructions also apply from Chapter 6: Diseases of the nervous system.
Alphabetic index entries
3 entriesTerms in the official ICD-10-CM index that lead to G47.419.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 01 · Diseases and Disorders of the Nervous System
ICD-9-CM equivalent
Converter →- 347.00Narcolepsy, without cataplexyexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about G47.419
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.
What DRG does G47.419 group to?
- G47.419 is used in the MS-DRG v44.0 logic for MS-DRG 091 (Other Disorders of Nervous System with MCC), MS-DRG 092 (Other Disorders of Nervous System with CC) and MS-DRG 093 (Other Disorders of Nervous System without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for G47.419?
- The CMS General Equivalence Mappings map G47.419 to ICD-9-CM 347.00.