G90.01 ICD-10-CM Code: Carotid sinus syncope
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Other disorders of the nervous system (G89-G99)
G90.01
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceCarotid sinus syncope
Carotid sinus syncope is a sudden fainting episode caused by pressure on the carotid sinus (a sensory area in the neck artery) that triggers an abnormal reflex, causing a sudden drop in heart rate and blood pressure. This condition typically occurs in older adults when the neck is turned or compressed.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Carotid sinus syndrome
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G90.01 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G90.01 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for G90.01 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G90.01 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G90.01 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G90.01 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is G90.01 an HCC code?
No. G90.01 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
G90.01 is the ICD-10-CM diagnosis code for carotid sinus syncope. Carotid sinus syncope is a sudden fainting episode caused by pressure on the carotid sinus (a sensory area in the neck artery) that triggers an abnormal reflex, causing a sudden drop in heart rate and blood pressure. This condition typically occurs in older adults when the neck is turned or compressed. G90.01 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering other disorders of the nervous system (g89-g99).
G90.01 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Ensure documentation specifies carotid sinus syncope rather than other types of syncope; query the provider if the syncope type is unclear or if only 'syncope' is documented.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G90.01 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Ensure documentation specifies carotid sinus syncope rather than other types of syncope; query the provider if the syncope type is unclear or if only 'syncope' is documented
- •This code is often associated with falls or injuries; review the medical record for any secondary diagnoses related to falls or trauma that should be coded separately