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ICD-10-CM 2027 diagnosis code

G90.01Carotid sinus syncope

✓ Billable / specific

G90.01 is a valid, billable ICD-10-CM code for carotid sinus syncope. 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 Carotidynia, ICD-10 code for Carotid body or sinus 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 G90.01

G90.01 is the ICD-10-CM diagnosis code for carotid sinus syncope. It belongs to category G90 (disorders of autonomic nervous system), block G89-G99 (other disorders of the nervous system) 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 G90.0 (idiopathic peripheral autonomic neuropathy), G90.01 is specifically for carotid sinus syncope. Related codes cover other idiopathic peripheral autonomic neuropathy (G90.09).

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 073 (Cranial and Peripheral Nerve Disorders with MCC, relative weight 1.5779) and DRG 074 (Cranial and Peripheral Nerve Disorders without MCC, relative weight 1.0173), 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 337.01 (carotid sinus syndrome).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Carotid sinus syndrome

Notes that apply from higher levels

Instructions written at a parent level also apply to G90.01.

› From G90 Disorders of autonomic nervous system
Excludes1
  • dysfunction of the autonomic nervous system due to alcohol (G31.2)

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

Alphabetic index entries

7 entries

Terms in the official ICD-10-CM index that lead to G90.01.

Codes whose notes reference G90.01

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 →
  • 337.01Carotid sinus syndromeapproximate

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 G90.01

Is G90.01 billable?

Yes. G90.01 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can G90.01 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict G90.01 as a principal diagnosis.

Is G90.01 a CC or MCC?

No. G90.01 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does G90.01 group to?

G90.01 is used in the MS-DRG v44.0 logic for MS-DRG 073 (Cranial and Peripheral Nerve Disorders with MCC) and MS-DRG 074 (Cranial and Peripheral Nerve Disorders without 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 G90.01?

The CMS General Equivalence Mappings map G90.01 to ICD-9-CM 337.01.