2020 ICD-10-CM Diagnosis Code G12.9

Spinal muscular atrophy, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • G12.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM G12.9 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of G12.9 - other international versions of ICD-10 G12.9 may differ.
The following code(s) above G12.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G12.9:
  • G00-G99
    2020 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the nervous system
Approximate Synonyms
  • Spinal muscular atrophy
Clinical Information
  • 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)
  • An inherited disorder characterized by degeneration of the spinal cord and the cerebellum. Symptoms may appear at any age and include progressive loss of coordination of gait, hands, speech, and eye movements.
  • Spinal muscular atrophy (sma) is a genetic disease that attacks nerve cells, called motor neurons, in your spinal cord. These neurons communicate with your voluntary muscles - the ones you can control, like in your arms and legs. As you lose the neurons, your 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, and some of them are fatal. Life expectancy depends on the type you have and how it affects your breathing. There is no cure. Medicines and physical therapy help treat symptoms.
ICD-10-CM G12.9 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 056 Degenerative nervous system disorders with mcc
  • 057 Degenerative nervous system disorders without mcc

Convert G12.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change

Diagnosis Index entries containing back-references to G12.9:
  • Atrophy, atrophic (of)
    • muscle, muscular (diffuse) (general) (idiopathic) (primary) M62.50
      ICD-10-CM Diagnosis Code M62.50

      Muscle wasting and atrophy, not elsewhere classified, unspecified site

        2016 2017 2018 2019 2020 Billable/Specific Code

ICD-10-CM Codes Adjacent To G12.9
G12.1 Other inherited spinal muscular atrophy
G12.2 Motor neuron disease
G12.20 …… unspecified
G12.21 Amyotrophic lateral sclerosis
G12.22 Progressive bulbar palsy
G12.23 Primary lateral sclerosis
G12.24 Familial motor neuron disease
G12.25 Progressive spinal muscle atrophy
G12.29 Other motor neuron disease
G12.8 Other spinal muscular atrophies and related syndromes
G12.9 Spinal muscular atrophy, unspecified
G13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere
G13.0 Paraneoplastic neuromyopathy and neuropathy
G13.1 Other systemic atrophy primarily affecting central nervous system in neoplastic disease
G13.2 Systemic atrophy primarily affecting the central nervous system in myxedema
G13.8 Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere
G14 Postpolio syndrome
G20 Parkinson's disease
G21 Secondary parkinsonism
G21.0 Malignant neuroleptic syndrome
G21.1 Other drug-induced secondary parkinsonism

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.