ICD-10 G63
Billable / Specific HCC v28: 75Polyneuropathy in diseases classified elsewhere
About ICD-10-CM G63
ICD-10-CM code G63 represents Polyneuropathy in diseases classified elsewhere. This is a billable/specific code in the Nervous System chapter (block G63). The 2026 edition of ICD-10-CM G63 became effective on October 1, 2025.
Coding Tips for G63
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
G63 is a CMS-HCC v28 risk-adjustment code (category 75). 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.
Type 1 Excludes
Pure excludes, these codes can never be coded together with G63. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- polyneuropathy (in):
- diabetes mellitus (E08-E13 with .42)
- diphtheria (A36.83)
- infectious mononucleosis complicated by polyneuropathy (B27.0-B27.9 with fifth character 1)
- Lyme disease (A69.22)
- mumps (B26.84)
- postherpetic (B02.23)
- rheumatoid arthritis (M05.5-)
- scleroderma (M34.83)
- systemic lupus erythematosus (M32.19)
Coding Notes
Code First
- underlying disease, such as:
- amyloidosis (E85.-)
- endocrine disease, except diabetes (E00-E07, E15-E16, E20-E34)
- metabolic diseases (E70-E88)
- neoplasm (C00-D49)
- nutritional deficiency (E40-E64)
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 G63
Local Coverage Determinations (LCDs) from CMS MACs that list G63 as a covered diagnosis.
Showing top 10 of 279 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G63.
1 Aetna
2 Cigna
5 Medicare
CPT Codes Commonly Billed with G63
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 G63 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 |
|---|---|---|
| G63 | 3574 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G63
Other codes in section G60-G65 (Polyneuropathies and other disorders of the peripheral nervous system).
ICD-10 G63, Billing FAQ
Is ICD-10 code G63 billable? +
Yes, G63 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for G63? +
Type 1 Excludes (never code together with G63): polyneuropathy (in):; diabetes mellitus (E08-E13 with .42); diphtheria (A36.83)
Does G63 affect Medicare Advantage HCC risk adjustment? +
Yes. G63 maps to CMS-HCC v28 category 75. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What ICD-9 codes does G63 map to? +
Per CMS GEMs, G63 maps to ICD-9 codes: 3574. 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 June 1, 2026.
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