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I63.531 vs I63.539

I63.531 (Cerebral infarction due to unspecified occlusion or stenosis of right posterior cerebral artery) compared with I63.539 (Cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery), from the official CMS tabular data. I63.531 and I63.539 code the same condition on opposite sides. MedCoder-derived

Relationship

Review

Laterality relationship

I63.531
Right
Cerebral infarction due to unspecified occlusion or stenosis of right posterior cerebral artery
↔
I63.539
Unspecified
Cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery

Same condition; these differ only in which side is documented.

These codes share a category and title and differ only in the side affected. The documentation decides which applies, and a bilateral code is reported only where the code set provides one.

Source: ICD-10-CM tabular list (laterality variant derived from the code title)

Can these codes be reported together?

Same condition, opposite side. I63.531 and I63.539 name the same condition on opposite sides of the body.

Same category and title, differing only in which side is affected — the documentation decides which one applies, and a bilateral code is reported only where the code set provides one.

Side by side

I63.531Cerebral infarction due to unspecified occlusion or stenosis of right posterior cerebral arteryI63.539Cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery
Billing statusBillableBillable
ClassificationI00-I99 — Diseases of the circulatory systemI00-I99 — Diseases of the circulatory system
DefinitionCerebral infarction due to unspecified occlusion or stenosis of right posterior cerebral artery is a billable ICD-10-CM diagnosis code (I63.531).Cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery is a billable ICD-10-CM diagnosis code (I63.539).
Includes
occlusion and stenosis of cerebral and precerebral arteries, resulting in cerebral infarction
occlusion and stenosis of cerebral and precerebral arteries, resulting in 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:
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