G90.09 ICD-10-CM Code: Other idiopathic peripheral autonomic neuropathy
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Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Other disorders of the nervous system (G89-G99)
G90.09
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther idiopathic peripheral autonomic neuropathy
This code describes a condition where the nerves that control automatic body functions (like heart rate, blood pressure, and digestion) are damaged for unknown reasons, affecting the peripheral nervous system. The cause cannot be identified despite medical investigation.
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- Idiopathic peripheral autonomic neuropathy NOS
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G90.09 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G90.09 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for G90.09 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G90.09 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G90.09 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G90.09 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 G90.09 an HCC code?
No. G90.09 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
G90.09 is the ICD-10-CM diagnosis code for other idiopathic peripheral autonomic neuropathy. This code describes a condition where the nerves that control automatic body functions (like heart rate, blood pressure, and digestion) are damaged for unknown reasons, affecting the peripheral nervous system. The cause cannot be identified despite medical investigation. G90.09 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).
G90.09 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.
Verify that the autonomic neuropathy is idiopathic (no identifiable cause) before assigning this code; if a secondary cause is documented (diabetes, infection, medication), use a more specific code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G90.09 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify that the autonomic neuropathy is idiopathic (no identifiable cause) before assigning this code; if a secondary cause is documented (diabetes, infection, medication), use a more specific code
- •This is a subcategory of G90.0, so ensure documentation specifies 'other' idiopathic peripheral autonomic neuropathy rather than other specified types like pure autonomic failure or postural orthostatic tachycardia syndrome