Specific code 2015 ICD-9-CM Diagnosis Code 359.21
Myotonic muscular dystrophy
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 359.21 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 359.21 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
Convert to ICD-10-CM: 359.21 converts directly to:
  • 2015/16 ICD-10-CM G71.11 Myotonic muscular dystrophy
Approximate Synonyms
  • Cardiomyopathy in myotonic dystrophy
  • Dilated cardiomyopathy secondary to myotonic dystrophy
  • Dystrophia myotonica facies
  • Myotonic cataract
  • Myotonic dystrophy
  • Steinert myotonic dystrophy syndrome
Clinical Information
  • Autosomal dominant neuromuscular disorder which usually presents in early adulthood, characterized by progressive muscular atrophy (most frequently involving the hands, forearms, and face), myotonia, frontal baldness, lenticular opacities, and testicular atrophy; cardiac conduction abnormalities, diaphragmatic weakness, and mild mental retardation may also occur; congenital myotonic dystrophy is a severe form of this disorder
Applies To
  • Dystrophia myotonica
  • Myotonia atrophica
  • Myotonic dystrophy
  • Proximal myotonic myopathy (PROMM)
  • Steinert's disease
ICD-9-CM Volume 2 Index entries containing back-references to 359.21:
  • Atrophy, atrophic
    • myotonia 359.21
  • Batten-Steinert syndrome 359.21
  • Curschmann (-Batten) (-Steinert) disease or syndrome 359.21
  • Disease, diseased - see also Syndrome
    • Batten-Steinert 359.21
    • Curschmann's 359.21
    • Steinert's 359.21
  • Dystrophy, dystrophia 783.9
    • myotonic 359.21
    • myotonica 359.21
  • Myopathy 359.9
    • proximal myotonic (PROMM) 359.21
  • Myotonia (acquisita) (intermittens) 728.85
    • atrophica 359.21
    • dystrophica 359.21
  • PROMM (proximal myotonic myotonia) 359.21
  • Steinert's disease 359.21
  • Syndrome - see also Disease
    • Batten-Steinert 359.21
    • Curschmann (-Batten) (-Steinert) 359.21
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 359.21 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.