ICD-10 code for cerebellar artery thrombosis

The ICD-10-CM code for cerebellar artery thrombosis is I66.3 (Occlusion and stenosis of cerebellar arteries).

Within I66 (occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction), I66.3 is specifically for occlusion and stenosis of cerebellar arteries. Related codes cover middle cerebral artery (I66.0), anterior cerebral artery (I66.1), posterior cerebral artery (I66.2), other cerebral arteries (I66.8) and unspecified cerebral artery (I66.9).

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 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), DRG 067 (Precerebral Occlusion without Infarction with MCC, relative weight 1.4274), DRG 068 (Precerebral Occlusion without Infarction without MCC, relative weight 0.9013), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and 1 more, in MDC 01 (Diseases and Disorders of the Nervous System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.