I65.9: Occlusion and stenosis of unspecified precerebral artery
I65.9, occlusion and stenosis of unspecified precerebral artery, is listed as a covered diagnosis in 3 Medicare billing and coding articles that apply to 14 HCPCS Level II codes, including G0453 (Continuous intraoperative neurophysiology monitoring, from…), C8900 (Magnetic resonance angiography with contrast, abdomen), C8901 (Magnetic resonance angiography without contrast, abdomen). The articles come from 2 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.
HCPCS Level II codes with I65.9 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| G0453 | Continuous intraoperative neurophysiology monitoring, from outside the operating room (remote or nearby), per patient, (attention directed exclusively to one patient) each 15 minutes (list in addition to primary procedure) | Carrier judgment | — | 1 |
| C8900 | Magnetic resonance angiography with contrast, abdomen | Special coverage instructions apply | — | 1 |
| C8901 | Magnetic resonance angiography without contrast, abdomen | Special coverage instructions apply | — | 1 |
| C8902 | Magnetic resonance angiography without contrast followed by with contrast, abdomen | Special coverage instructions apply | — | 1 |
| C8909 | Magnetic resonance angiography with contrast, chest (excluding myocardium) | Special coverage instructions apply | — | 1 |
| C8910 | Magnetic resonance angiography without contrast, chest (excluding myocardium) | Special coverage instructions apply | — | 1 |
| C8911 | Magnetic resonance angiography without contrast followed by with contrast, chest (excluding myocardium) | Special coverage instructions apply | — | 1 |
| C8912 | Magnetic resonance angiography with contrast, lower extremity | Special coverage instructions apply | — | 1 |
| C8913 | Magnetic resonance angiography without contrast, lower extremity | Special coverage instructions apply | — | 1 |
| C8914 | Magnetic resonance angiography without contrast followed by with contrast, lower extremity | Special coverage instructions apply | — | 1 |
| C8918 | Magnetic resonance angiography with contrast, pelvis | Special coverage instructions apply | — | 1 |
| C8919 | Magnetic resonance angiography without contrast, pelvis | Special coverage instructions apply | — | 1 |
| C8920 | Magnetic resonance angiography without contrast followed by with contrast, pelvis | Special coverage instructions apply | — | 1 |
| G0451 | Development testing, with interpretation and report, per standardized instrument form | Carrier judgment | — | 1 |
Medicare policy articles listing I65.9
- A56722: Billing and Coding: Intraoperative Neurophysiological Testing (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34623, L35003
- A56805: Billing and Coding: Magnetic Resonance Angiography (MRA) (Novitas Solutions, Inc. (MAC - Part A, MAC - Part B); 12 Level II codes). LCD with the same title: L33633, L34372, L34865
- A57780: Billing and Coding: Psychological and Neuropsychological Tests (First Coast Service Options, Inc. (MAC - Part A, MAC - Part B); 1 Level II codes). LCD with the same title: L34520
A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.
Other I65 diagnoses (Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction)
- I65.01 — Occlusion and stenosis of right vertebral artery
- I65.02 — Occlusion and stenosis of left vertebral artery
- I65.03 — Occlusion and stenosis of bilateral vertebral arteries
- I65.1 — Occlusion and stenosis of basilar artery
- I65.21 — Occlusion and stenosis of right carotid artery
- I65.22 — Occlusion and stenosis of left carotid artery
- I65.23 — Occlusion and stenosis of bilateral carotid arteries
- I65.8 — Occlusion and stenosis of other precerebral arteries
Frequently asked questions
Does Medicare cover I65.9 (Occlusion and stenosis of unspecified precerebral artery)?
Medicare covers items and services, not diagnoses. 3 Medicare billing and coding articles list I65.9 as a covered diagnosis for 14 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.
Which HCPCS codes can be billed with ICD-10 I65.9?
The Level II codes from the policies most specific to this diagnosis are G0453 (Continuous intraoperative neurophysiology monitoring, from…, 1 article); C8900 (Magnetic resonance angiography with contrast, abdomen, 1 article); C8901 (Magnetic resonance angiography without contrast, abdomen, 1 article); C8902 (Magnetic resonance angiography without contrast followed…, 1 article); C8909 (Magnetic resonance angiography with contrast, chest…, 1 article). Code choice depends on the item supplied; check each code's descriptor.
Which Medicare policy articles list I65.9?
A56722 (Billing and Coding: Intraoperative Neurophysiological Testing); A56805 (Billing and Coding: Magnetic Resonance Angiography (MRA)); A57780 (Billing and Coding: Psychological and Neuropsychological Tests).
What is ICD-10-CM code I65.9?
I65.9 is the ICD-10-CM code for occlusion and stenosis of unspecified precerebral artery, in category I65 (Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction), chapter 9: Diseases of the circulatory system.
Next steps
- Run a reimbursement report for a device billed under G0453
- Watch G0453 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for G0453
Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.
Chapter 9: Diseases of the circulatory system · All diagnoses · HCPCS lookup