ICD-10-CM · Chapter 18 · R00-R99
R55 Syncope and collapse
Includes
- Blackout
- Fainting
- Vasovagal attack
Excludes 1 (cannot be coded together)
- cardiogenic shock (R57.0)
- carotid sinus syncope (G90.01)
- heat syncope (T67.1)
- neurocirculatory asthenia (F45.8)
- neurogenic orthostatic hypotension (G90.3)
- orthostatic hypotension (I95.1)
- postprocedural shock (T81.1-)
- psychogenic syncope (F48.8)
- shock NOS (R57.9)
- shock complicating or following abortion or ectopic or molar pregnancy (O00-O07, O08.3)
- shock complicating or following labor and delivery (O75.1)
- Stokes-Adams attack (I45.9)
- unconsciousness NOS (R40.2-)
This category is a complete, billable diagnosis code.
No additional specificity is required — submit R55 directly on claims and documentation without a subcode extension.
Plain-language terms for this code
The following entries in the US Medical Glossary correspond to ICD-10-CM category R55:
- Fainting — Desmayo
- Loss of Consciousness — Pérdida del conocimiento
Last reviewed: September 2026