I66.22 is the authoritative medical code for Occlusion and stenosis of left posterior cerebral artery. This classification is used in medical billing and clinical recording to specify the clinical criteria for occlusion and stenosis of left posterior cerebral artery (ICD-10-CM I66.22), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Occlusion and stenosis of left posterior cerebral artery is a billable ICD-10-CM diagnosis code I66.22. Includes: embolism of cerebral artery; narrowing of cerebral artery; obstruction complete partial of cerebral artery; thrombosis of cerebral artery. Excludes1 (not coded here): Occlusion and stenosis of cerebral artery causing cerebral infarction I63.3-I63.5; traumatic intracranial hemorrhage S06.-. Use additional code: code to identify presence of:; alcohol abuse and dependence F10.-; exposure to environmental tobacco smoke Z77.22; history of tobacco dependence Z87.891; hypertension I10-I1A; occupational exposure to environmental tobacco smoke Z57.31; tobacco dependence F17.-; tobacco use Z72.0.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for I66.22 in the official ICD-10-CM tabular list.
Includes
Conditions the official ICD-10-CM tabular list includes under this code.
- embolism of cerebral artery
- narrowing of cerebral artery
- obstruction complete partial of cerebral artery
- thrombosis of cerebral artery
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- Occlusion and stenosis of cerebral artery causing cerebral infarction I63.3-I63.5
- traumatic intracranial hemorrhage S06.-
Use Additional Code
Supplementary codes the tabular list directs you to add.
- code to identify presence of:
- alcohol abuse and dependence F10.-
- exposure to environmental tobacco smoke Z77.22
- history of tobacco dependence Z87.891
- hypertension I10-I1A
- occupational exposure to environmental tobacco smoke Z57.31
- tobacco dependence F17.-
- tobacco use Z72.0
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with I66.22?
Per Excludes1 instructions, I66.22 must not be reported with: Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5); traumatic intracranial hemorrhage (S06.-).
Is an additional code needed with I66.22?
Use additional code(s) to specify: code to identify presence of:; alcohol abuse and dependence (F10.-); exposure to environmental tobacco smoke (Z77.22); history of tobacco dependence (Z87.891).
Codes in This Family (18)
Official ICD-10-CM classifications in the same code family as I66.22, with their registry titles.
- I66 — Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
- I66.0 — Occlusion and stenosis of middle cerebral artery
- I66.01 — Occlusion and stenosis of right middle cerebral artery
- I66.02 — Occlusion and stenosis of left middle cerebral artery
- I66.03 — Occlusion and stenosis of bilateral middle cerebral arteries
- I66.09 — Occlusion and stenosis of unspecified middle cerebral artery
- I66.1 — Occlusion and stenosis of anterior cerebral artery
- I66.11 — Occlusion and stenosis of right anterior cerebral artery
- I66.12 — Occlusion and stenosis of left anterior cerebral artery
- I66.13 — Occlusion and stenosis of bilateral anterior cerebral arteries
- I66.19 — Occlusion and stenosis of unspecified anterior cerebral artery
- I66.2 — Occlusion and stenosis of posterior cerebral artery
- I66.21 — Occlusion and stenosis of right posterior cerebral artery
- I66.23 — Occlusion and stenosis of bilateral posterior cerebral arteries
- I66.29 — Occlusion and stenosis of unspecified posterior cerebral artery
- I66.3 — Occlusion and stenosis of cerebellar arteries
- I66.8 — Occlusion and stenosis of other cerebral arteries
- I66.9 — Occlusion and stenosis of unspecified cerebral artery
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code I63.22
Cerebral infarction due to unspecified occlusion or stenosis of basilar artery
ICD Code I69.22
Speech and language deficits following other nontraumatic intracranial hemorrhage
ICD Code I70.22
Atherosclerosis of native arteries of extremities with rest pain