I66.2 — Occlusion and stenosis of posterior cerebral artery
Is I66.2 billable?
No — I66.2 is a non-billable header code. I66.2 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath I66.2.
I66.2 at a glance
| Code | I66.2 |
|---|---|
| Description | Occlusion and stenosis of posterior cerebral artery |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
How is I66.2 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to I66.2. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Occlusion, occluded › artery › cerebral › posterior
Excludes1 — never code together — inherited from I60-I69
The conditions below can never be reported together with I66.2 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- traumatic intracranial hemorrhage (S06.-)
Excludes1 — never code together — inherited from I66
The conditions below can never be reported together with I66.2 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
Use additional code — inherited from I60-I69
Report an additional code alongside I66.2 to fully describe the condition. I66.2 is sequenced first.
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I66.2, but a patient may have both at the same time. When documentation supports it, I66.2 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
What codes fall under I66.2? (4)
How long has I66.2 existed?
I66.2 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.