ICD-10 G13.8
Billable / Specific HCC v28: 52Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere
About ICD-10-CM G13.8
ICD-10-CM code G13.8 represents Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere. This is a billable/specific code in the Nervous System chapter (block G13). The 2026 edition of ICD-10-CM G13.8 became effective on October 1, 2025.
Coding Tips for G13.8
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
G13.8 is a CMS-HCC v28 risk-adjustment code (category 52). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Coding Notes
Code First
- underlying disease
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for G13.8
Local Coverage Determinations (LCDs) from CMS MACs that list G13.8 as a covered diagnosis.
Showing top 10 of 70 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G13.8.
1 Cigna
4 Medicare
1 Aetna
CPT Codes Commonly Billed with G13.8
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert G13.8 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| G13.8 | 3317 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G13.8
Other codes in section G10-G14 (Systemic atrophies primarily affecting the central nervous system).
ICD-10 G13.8, Billing FAQ
Is ICD-10 code G13.8 billable? +
Yes, G13.8 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Does G13.8 affect Medicare Advantage HCC risk adjustment? +
Yes. G13.8 maps to CMS-HCC v28 category 52. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What ICD-9 codes does G13.8 map to? +
Per CMS GEMs, G13.8 maps to ICD-9 codes: 3317. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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