ICD-10 Code G90.01 – Carotid sinus syncope (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.01 – Carotid sinus syncope
What it is
G90.01 identifies syncope caused by hypersensitivity of the carotid sinus, a reflex in the neck that can trigger a sudden drop in heart rate or blood pressure. It is used when the fainting episodes are documented as carotid sinus syncope.
Clinical signs
Typical documentation includes recurrent fainting or near-fainting, often triggered by turning the head, shaving, tight collars, or neck pressure. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider specifically diagnoses carotid sinus syncope or carotid sinus hypersensitivity as the cause of syncope. It may appear in evaluations for unexplained falls, transient loss of consciousness, or reflex-mediated syncope. Check documentation if the record only says “syncope” without a stated cause.
Do not use for
Do not assign G90.01 for syncope with another documented cause, such as orthostatic hypotension, cardiac arrhythmia, or vasovagal syncope. Do not use it when the chart does not clearly link the episode to carotid sinus dysfunction.
Coding tip
Code G90.01 only when the provider documents carotid sinus syncope by name or clearly states the cause.