I63.543 vs P91.82

I63.543 (Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries) compared with P91.82 (Neonatal cerebral infarction), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Relationship

Conflict

Excludes1 conflict

I63.543

Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries

↔

P91.82

Neonatal cerebral infarction

Not coded here — these two are mutually exclusive.

“neonatal cerebral infarction (P91.82-)”

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. I63.543 carries an Excludes1 note covering P91.82: “neonatal cerebral infarction (P91.82-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	I63.543Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries	P91.82Neonatal cerebral infarction
Billing status	Billable	Non-billable header Report instead: P91.821, P91.822, P91.823, P91.829
Classification	I00-I99 — Diseases of the Circulatory System (I00-I99)	P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96)
Definition	Cerebral infarction due to unspecified occlusion or stenosis of bilateral cerebellar arteries is a billable ICD-10-CM diagnosis code (I63.543).	Neonatal cerebral infarction is a non-billable ICD-10-CM category code (P91.82).
Includes	occlusion and stenosis of cerebral and precerebral arteries, resulting in cerebral infarction	Neonatal stroke Perinatal arterial ischemic stroke Perinatal cerebral infarction
Use additional code	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) code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-) code to identify presence of:	—

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources