Skip to content
Dx

ICD-10-CM 2027 diagnosis code

G46.0Middle cerebral artery syndrome

✓ Billable / specificCC — complication/comorbidity

G46.0 is a valid, billable ICD-10-CM code for middle cerebral artery syndrome. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 G46.0

G46.0 is the ICD-10-CM diagnosis code for middle cerebral artery syndrome. It belongs to category G46 (vascular syndromes of brain in cerebrovascular diseases), 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 G46 (vascular syndromes of brain in cerebrovascular diseases), G46.0 is specifically for middle cerebral artery syndrome. Related codes cover anterior cerebral artery syndrome (G46.1), posterior cerebral artery syndrome (G46.2), brain stem stroke syndrome (G46.3), cerebellar stroke syndrome (G46.4), pure motor lacunar syndrome (G46.5), pure sensory lacunar syndrome (G46.6), other lacunar syndromes (G46.7) and other vascular syndromes of brain in cerebrovascular diseases (G46.8).

Code first: underlying cerebrovascular disease (I60-I69).

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 061 (Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with MCC, relative weight 2.7211), DRG 062 (Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with CC, relative weight 1.7781), DRG 063 (Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent without CC/MCC, relative weight 1.455) and DRG 069 (Transient Ischemia without Thrombolytic, relative weight 0.7964), 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 435.8 (other specified transient cerebral ischemias).

Notes that apply from higher levels

Instructions written at a parent level also apply to G46.0.

› From G46 Vascular syndromes of brain in cerebrovascular diseases
Code first
  • underlying cerebrovascular disease (I60-I69)

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

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to G46.0.

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 →
  • 435.8Other specified transient cerebral ischemiasapproximate

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 G46.0

Is G46.0 billable?

Yes. G46.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can G46.0 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict G46.0 as a principal diagnosis.

Is G46.0 a CC or MCC?

G46.0 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does G46.0 group to?

G46.0 is used in the MS-DRG v44.0 logic for MS-DRG 061 (Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with MCC), MS-DRG 062 (Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with CC), MS-DRG 063 (Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent without CC/MCC) and MS-DRG 069 (Transient Ischemia without Thrombolytic). 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 G46.0?

The CMS General Equivalence Mappings map G46.0 to ICD-9-CM 435.8.