ICD-10-CM Code G12.9

Spinal muscular atrophy, unspecified

Version 2021 Billable Code

Valid for Submission

G12.9 is a billable code used to specify a medical diagnosis of spinal muscular atrophy, unspecified. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code G12.9 might also be used to specify conditions or terms like distal hereditary motor neuropathy type 1 or distal spinal muscular atrophy or spinal muscular atrophy or spinal muscular atrophy with progressive myoclonic epilepsy.

Short Description:Spinal muscular atrophy, unspecified
Long Description:Spinal muscular atrophy, unspecified

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code G12.9 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Distal hereditary motor neuropathy type 1
  • Distal spinal muscular atrophy
  • Spinal muscular atrophy
  • Spinal muscular atrophy with progressive myoclonic epilepsy

Clinical Information

  • MUSCULAR ATROPHY SPINAL-. a 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. diseases in this category include werdnig hoffmann disease and later onset spinal muscular atrophies of childhood most of which are hereditary. adams et al. principles of neurology 6th ed p1089
  • SPINAL MUSCULAR ATROPHIES OF CHILDHOOD-. a group of recessive inherited diseases that feature progressive muscular atrophy and hypotonia. they are classified as type i werdnig hoffman disease type ii intermediate form and type iii kugelberg welander disease. type i is fatal in infancy type ii has a late infantile onset and is associated with survival into the second or third decade. type iii has its onset in childhood and is slowly progressive. j med genet 1996 apr:334:281 3

Convert G12.9 to ICD-9

  • 335.10 - Spinal muscl atrophy NOS (Approximate Flag)
  • 335.9 - Ant horn cell dis NOS (Approximate Flag)

Code Classification

  • Diseases of the nervous system (G00–G99)
    • Systemic atrophies primarily affecting the central nervous system (G10-G14)
      • Spinal muscular atrophy and related syndromes (G12)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients

Spinal Muscular Atrophy

Also called: SMA

Spinal muscular atrophy (SMA) is a genetic disease that attacks nerve cells, called motor neurons, in the spinal cord. These cells communicate with your voluntary muscles - the ones you can control, like in your arms and legs. As the neurons die, the muscles weaken. This can affect walking, crawling, breathing, swallowing, and head and neck control.

SMA runs in families. Parents usually have no symptoms, but still carry the gene. Genetic counseling is important if the disease runs in your family.

There are many types of SMA. Some of them are fatal. Some people have a normal life expectancy. It depends on the type and how it affects breathing. There is no cure. Treatments help with symptoms and prevent complications. They may include machines to help with breathing, nutritional support, physical therapy, and medicines.

NIH: National Institute of Neurological Disorders and Stroke

  • Spinal muscular atrophy (Medical Encyclopedia)
  • Swallowing problems (Medical Encyclopedia)

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