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ICD-10-CM 2027 diagnosis code

G47.26Circadian rhythm sleep disorder, shift work type

✓ Billable / specific

G47.26 is a valid, billable ICD-10-CM code for circadian rhythm sleep disorder, shift work type. 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 Changing sleep-work schedule, ICD-10 code for Shifting sleep-work schedule.

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 G47.26

G47.26 is the ICD-10-CM diagnosis code for circadian rhythm sleep disorder, shift work type. 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 G47.2 (circadian rhythm sleep disorders), G47.26 is specifically for circadian rhythm sleep disorder, shift work type. Related codes cover circadian rhythm sleep disorder, unspecified type (G47.20), circadian rhythm sleep disorder, delayed sleep phase type (G47.21), circadian rhythm sleep disorder, advanced sleep phase type (G47.22), circadian rhythm sleep disorder, irregular sleep wake type (G47.23), circadian rhythm sleep disorder, free running type (G47.24), circadian rhythm sleep disorder, jet lag type (G47.25), circadian rhythm sleep disorder in conditions classified elsewhere (G47.27) and other circadian rhythm sleep disorder (G47.29).

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 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC, relative weight 5.6154), DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC, relative weight 4.381), DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC, relative weight 2.7307), 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 Pre-MDC and 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 327.36 (circadian rhythm sleep disorder, shift work type).

Notes that apply from higher levels

Instructions written at a parent level also apply to G47.26.

› From G47 Sleep disorders
Excludes2
  • nightmares (F51.5)
  • nonorganic sleep disorders (F51.-)
  • sleep terrors (F51.4)
  • sleepwalking (F51.3)

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to G47.26.

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.

ICD-9-CM equivalent

Converter →
  • 327.36Circadian rhythm sleep disorder, shift work typeexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about G47.26

Is G47.26 billable?

Yes. G47.26 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can G47.26 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict G47.26 as a principal diagnosis.

Is G47.26 a CC or MCC?

No. G47.26 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does G47.26 group to?

G47.26 is used in the MS-DRG v44.0 logic for MS-DRG 011 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with MCC), MS-DRG 012 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy with CC), MS-DRG 013 (Tracheostomy for Face, Mouth and Neck Diagnoses or Laryngectomy without CC/MCC), 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 G47.26?

The CMS General Equivalence Mappings map G47.26 to ICD-9-CM 327.36.