Specific code 2014 ICD-9-CM Diagnosis Code 335.21
Progressive muscular atrophy
  • Billable Code
  • Short description: Prog muscular atrophy.
  • ICD-9-CM 335.21 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 335.21 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Clinical Information
  • A rare, milder form of amyotrophic lateral sclerosis. It is characterized by a slowly progressive clinical course. Signs and symptoms include muscle weakness, atrophy, and fasciculation.
  • Group of disorders marked by progressive degeneration of motor neurons in the spinal cord resulting in weakness and muscular atrophy, usually without evidence of injury to the corticospinal tracts.
Applies To
  • Duchenne-Aran muscular atrophy
  • Progressive muscular atrophy (pure)
Convert to ICD-10-CM: 335.21 converts approximately to:
  • 2014 ICD-10-CM G12.21 Amyotrophic lateral sclerosis
ICD-9-CM Volume 2 Index entries containing back-references to 335.21:
  • Amyotrophia, amyotrophy, amyotrophic 728.2
    • spinal progressive 335.21
  • Atrophy, atrophic
    • Aran-Duchenne muscular 335.21
    • Cruveilhier's 335.21
    • Duchenne-Aran 335.21
  • Creeping
    • palsy 335.21
    • paralysis 335.21
  • Cruveilhier's disease 335.21
  • Disease, diseased - see also Syndrome
    • Cruveilhier's 335.21
    • wasting NEC 799.4
      • due to malnutrition 261
      • paralysis 335.21
  • Duchenne-Aran myelopathic, muscular atrophy (nonprogressive) (progressive) 335.21
  • Palsy (see also Paralysis) 344.9
    • creeping 335.21
    • wasting 335.21
  • Paralysis, paralytic (complete) (incomplete) 344.9
    • atrophic 356.9
      • infantile, acute (see also Poliomyelitis, with paralysis) 045.1
      • muscle NEC 355.9
      • progressive 335.21
      • spinal (acute) (see also Poliomyelitis, with paralysis) 045.1
    • creeping 335.21
    • muscular (atrophic) 359.9
      • progressive 335.21
    • wasting 335.21
  • Poliomyelitis (acute) (anterior) (epidemic) 045.9
    • chronic 335.21
  • Wasting
    • palsy, paralysis 335.21
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 335.21 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 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.