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I63.511 vs I63.519

I63.511 (Cerebral infarction due to unspecified occlusion or stenosis of right middle cerebral artery) compared with I63.519 (Cerebral infarction due to unspecified occlusion or stenosis of unspecified middle cerebral artery), from the official CMS tabular data. I63.511 and I63.519 code the same condition on opposite sides.

Relationship

Review

Laterality relationship

I63.511
Right
Cerebral infarction due to unspecified occlusion or stenosis of right middle cerebral artery
↔
I63.519
Unspecified
Cerebral infarction due to unspecified occlusion or stenosis of unspecified middle 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. I63.511 and I63.519 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

I63.511Cerebral infarction due to unspecified occlusion or stenosis of right middle cerebral arteryI63.519Cerebral infarction due to unspecified occlusion or stenosis of unspecified middle cerebral artery
Billing statusBillableBillable
ClassificationI00-I99 — Diseases of the Circulatory System (I00-I99)I00-I99 — Diseases of the Circulatory System (I00-I99)
DefinitionCerebral infarction due to unspecified occlusion or stenosis of right middle cerebral artery is a billable ICD-10-CM diagnosis code (I63.511).Cerebral infarction due to unspecified occlusion or stenosis of unspecified middle cerebral artery is a billable ICD-10-CM diagnosis code (I63.519).
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