Specific code 2014 ICD-9-CM Diagnosis Code 333.2
Myoclonus
  • Billable Code
  • ICD-9-CM 333.2 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 333.2 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Benign myoclonus of infancy
  • Benign neonatal sleep myoclonus (disorder)
  • Epilepsy, progressive myoclonic
  • Familial essential myoclonus
  • Insomnia due to nocturnal myoclonus
  • Insomnia, due to nocturnal myoclonus
  • Myoclonic disorder
  • Myoclonus of stapedius muscle (disorder)
  • Myoclonus of tensor tympani muscle (disorder)
  • Myoclonus tensor tympani muscle
  • Myoclonus, non epileptic
  • Myoclonus, stapes
  • Non epileptic myoclonus
  • Non-epileptic myoclonus (disorder)
  • Palatal myoclonus
  • Paramyoclonus multiplex
  • Progressive myoclonic epilepsy (disorder)
  • Stapes myoclonus
  • Tensor tympani myoclonus
Clinical Information
  • A sudden, brief, strong contraction of a muscle or group of muscles that cannot be controlled.
  • A sudden, involuntary contraction of a muscle or group of muscles; these movements may develop as a symptom of a number of neurological diseases including epilepsy, parkinson's disease, alzheimer's disease, or creutzfeldt-jacob disease.
  • Involuntary shock-like contractions, irregular in rhythm and amplitude, followed by relaxation, of a muscle or a group of muscles. This condition may be a feature of some central nervous system diseases; (e.g., epilepsy, myoclonic). Nocturnal myoclonus is the principal feature of the nocturnal myoclonus syndrome. (from Adams et al., Principles of Neurology, 6th ed, pp102-3).
  • Shock-like contraction of a portion of a muscle, an entire muscle, or a group of muscles; may be part of a disease process or a normal physiological response.
333.2 Excludes
  • Progressive myoclonic epilepsy (345.1)
  • Unverricht-Lundborg disease (345.1)
Applies To
  • Familial essential myoclonus
  • Palatal myoclonus
Use Additional
  • Use additional E code to identify drug, if drug-induced
Convert to ICD-10-CM: 333.2 converts directly to:
  • 2014 ICD-10-CM G25.3 Myoclonus
ICD-9-CM Volume 2 Index entries containing back-references to 333.2:
  • Convulsions (idiopathic) 780.39
    • myoclonic 333.2
  • Disease, diseased - see also Syndrome
    • Friedreich's
      • combined systemic or ataxia 334.0
      • facial hemihypertrophy 756.0
      • myoclonia 333.2
    • Lafora's 333.2
  • Friedreich's
    • disease 333.2
    • myoclonia 333.2
  • Jerks, myoclonic 333.2
  • Lafora's disease 333.2
  • Myoclonia (essential) 333.2
    • Friedrich's 333.2
    • massive 333.2
  • Myoclonic
    • jerks 333.2
  • Myoclonus (familial essential) (multifocal) (simplex) 333.2
    • with epilepsy and with ragged red fibers (MERRF syndrome) 277.87
    • massive (infantile) 333.2
    • palatal 333.2
    • pharyngeal 333.2
  • Paramyoclonus multiplex 333.2
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 333.2 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.