ICD-10 G71.13
Billable / SpecificMyotonic chondrodystrophy
About ICD-10-CM G71.13
ICD-10-CM code G71.13 represents Myotonic chondrodystrophy. This is a billable/specific code in the Nervous System chapter (block G71). The 2026 edition of ICD-10-CM G71.13 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under G71.13. Per CMS ICD-10-CM Tabular 2026.
- Chondrodystrophic myotonia
- Congenital myotonic chondrodystrophy
- Schwartz-Jampel 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 G71.13
Local Coverage Determinations (LCDs) from CMS MACs that list G71.13 as a covered diagnosis.
Showing top 10 of 624 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G71.13.
1 Cigna
5 Medicare
CPT Codes Commonly Billed with G71.13
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
Convert G71.13 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 |
|---|---|---|
| G71.13 | 35923 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G71.13
Other codes in section G70-G73 (Diseases of myoneural junction and muscle).
ICD-10 G71.13, Billing FAQ
Is ICD-10 code G71.13 billable? +
Yes, G71.13 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to G71.13? +
ICD-10 G71.13 includes: Chondrodystrophic myotonia; Congenital myotonic chondrodystrophy; Schwartz-Jampel disease.
What CPT codes are commonly billed with G71.13? +
Procedures frequently paired with G71.13 include: G0161, G0153.
What ICD-9 codes does G71.13 map to? +
Per CMS GEMs, G71.13 maps to ICD-9 codes: 35923. 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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