G45 vs I65
G45 (Transient cerebral ischemic attacks and related syndromes) compared with I65 (Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. I65 carries an Excludes1 note covering G45: “insufficiency, NOS, of precerebral artery (G45.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| G45Transient cerebral ischemic attacks and related syndromes | I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | I00-I99 — Diseases of the Circulatory System (I00-I99) |
| Definition | Transient cerebral ischemic attacks and related syndromes is a non-billable ICD-10-CM category code (G45). | Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction is a non-billable ICD-10-CM category code (I65). |
| Includes | — | embolism of precerebral artery narrowing of precerebral artery obstruction (complete) (partial) of precerebral artery thrombosis of precerebral artery |
| Use additional code | — | code to identify presence of: alcohol abuse and dependence (F10.-) exposure to environmental tobacco smoke (Z77.22) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources