G46.7Other lacunar syndromes

G46.7 is the ICD-10-CM diagnosis code for other lacunar syndromes. 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, choose G46.7 (Other lacunar syndromes) only when documentation doesn't support a more specific option: middle cerebral artery syndrome (G46.0), 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) and other vascular syndromes of brain in cerebrovascular diseases (G46.8).

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

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 070 (Other Cerebrovascular Disorders with MCC, relative weight 1.6093), DRG 071 (Other Cerebrovascular Disorders with CC, relative weight 1.0177) and DRG 072 (Other Cerebrovascular Disorders without CC/MCC, relative weight 0.7348), 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 437.8 (other ill-defined cerebrovascular disease).