G71.13 Myotonic chondrodystrophy

Billable ICD-10-CM code, FY2026.

Applicable to

• Chondrodystrophic myotonia
• Congenital myotonic chondrodystrophy
• Schwartz-Jampel disease

Applies from G71 Primary disorders of muscles

Excludes2 (not included here)

• arthrogryposis multiplex congenita (Q74.3)
• metabolic disorders (E70-E88)
• myositis (M60.-)

MS-DRG index

Defines the logic of DRG(s) 091-093 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 359.23 Myotonic chondrodystrophy

Code annotations containing back-references to G71.13

Back-references to G71.13

• Type 2 Excludes: Q68 Other congenital musculoskeletal deformities ("congenital myotonic chondrodystrophy (G71.13)")
• Type 2 Excludes: Q77 Osteochondrodysplasia with defects of growth of tubular bones and spine ("congenital myotonic chondrodystrophy (G71.13)")
• Type 2 Excludes: Q78 Other osteochondrodysplasias ("congenital myotonic chondrodystrophy (G71.13)")

Back-references to G71.1

• Code First: H28 Cataract in diseases classified elsewhere ("myotonia (G71.1-)")

Back-references to G71

• Code First: M62.84 Sarcopenia ("primary disorders of muscles (G71.-)")

Diagnosis Index entries for G71.13

• Chondrodystrophy, chondrodystrophia (familial) (fetalis) (hypoplastic) › myotonic (congenital)
• Disease, diseased › Schwartz-Jampel
• Myotonia (acquisita) (intermittens) › chondrodystrophic
• Schwartz (-Jampel) syndrome
• Syndrome › Schwartz (-Jampel)

Nearby codes

• G71.039 Limb girdle muscular dystrophy, unspecified
• G71.09 Other specified muscular dystrophies
• G71.1 Myotonic disorders
• G71.11 Myotonic muscular dystrophy
• G71.12 Myotonia congenita
• G71.13 Myotonic chondrodystrophy (this code)
• G71.14 Drug induced myotonia
• G71.19 Other specified myotonic disorders
• G71.2 Congenital myopathies
• G71.20 Congenital myopathy, unspecified
• G71.21 Nemaline myopathy