I63.5Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries

I63.5 is the ICD-10-CM diagnosis code for cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries. It belongs to category I63 (cerebral infarction), block I60-I69 (cerebrovascular diseases) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

Within I63, choose I63.5 (due to unspecified occlusion or stenosis of cerebral arteries) only when documentation doesn't support a more specific option: due to thrombosis of precerebral arteries (I63.0), due to embolism of precerebral arteries (I63.1), due to unspecified occlusion or stenosis of precerebral arteries (I63.2), due to thrombosis of cerebral arteries (I63.3), due to embolism of cerebral arteries (I63.4), due to cerebral venous thrombosis, nonpyogenic (I63.6), other cerebral infarction (I63.8) and unspecified (I63.9).

To report this condition, pick the subcode that matches the documentation: I63.50 (artery), I63.51 (artery), I63.52 (artery), I63.53 (artery), I63.54 (artery) and I63.59 (artery).

Use an additional code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82). Use an additional code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.