ICD-10-CM 2027
ICD-10 code for subclavian steal syndrome
Other transient cerebral ischemic attacks and related syndromes
From the official ICD-10-CM alphabetic index entry “Syndrome › subclavian steal”. Page updated September 29, 2026.
About coding subclavian steal syndrome
The ICD-10-CM code for subclavian steal syndrome is G45.8 (Other transient cerebral ischemic attacks and related syndromes).
Within G45, choose G45.8 (Other transient cerebral ischemic attacks and related syndromes) only when documentation doesn't support a more specific option: Vertebro-basilar artery syndrome (G45.0), carotid artery syndrome (hemispheric) (G45.1), multiple and bilateral precerebral artery syndromes (G45.2), Amaurosis fugax (G45.3), transient global amnesia (G45.4) and transient cerebral ischemic attack, unspecified (G45.9).
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.
Common questions about subclavian steal syndrome ICD-10 codes
What is the ICD-10 code for subclavian steal syndrome?
- G45.8 — Other transient cerebral ischemic attacks and related syndromes.
Is G45.8 billable?
- Yes. G45.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G45.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G45.8 as a principal diagnosis.
Is G45.8 a CC or MCC?
- G45.8 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.