G90.01 vs R55
G90.01 (Carotid sinus syncope) compared with R55 (Syncope and collapse), 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. R55 carries an Excludes1 note covering G90.01: “carotid sinus syncope (G90.01)”
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
| G90.01Carotid sinus syncope | R55Syncope and collapse | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | R00-R99 — Symptoms, Signs and Abnormal Clinical and Laboratory Findings, Not Elsewhere Classified (R00-R99) |
| Definition | Carotid sinus syncope is a billable ICD-10-CM diagnosis code (G90.01). | Syncope and collapse is a billable ICD-10-CM diagnosis code (R55). |
| Includes | Carotid sinus syndrome | Blackout Fainting Vasovagal attack |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources