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G71.12

Billable

Myotonia congenita

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

A genetic muscle disorder present from birth that causes stiffness and delayed muscle relaxation after contraction, without associated skeletal abnormalities.

Coding Tips

  • •Distinguish this from myotonic dystrophy (G71.11) which has systemic manifestations; myotonia congenita is primarily a muscle disorder
  • •Document whether the patient has generalized or localized myotonia to support the diagnosis

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