ICD Code G31.9

ICD code G31.9 is degenerative disease of the nervous system, unspecified. This code is used when a patient has a degenerative condition affecting the nervous system, but the specific type or cause is not identified.

1. Presence of progressive neurological decline not attributable to a specific, identifiable degenerative disorder

2. Evidence of cognitive, motor, or sensory impairment consistent with a degenerative process

3. Exclusion of other neurological conditions with known etiology (e.g., vascular, infectious, metabolic, or traumatic causes)

4. Absence of sufficient clinical, laboratory, or imaging findings to classify the disease under a more specific degenerative nervous system diagnosis

5. Documentation of chronic and worsening symptoms such as memory loss, movement abnormalities, or behavioral changes

6. Symptoms not meeting criteria for more defined neurodegenerative diseases (e.g., Alzheimer’s, Parkinson’s, Huntington’s)

Relevant CPT codes that may be used to treat ICD code G31.9 include:

- 99202–99215 (Evaluation and Management services, new and established patients)

- 96116 (Neurobehavioral status exam)

- 96132–96133 (Neuropsychological testing evaluation services)

- 96136–96139 (Neuropsychological or psychological test administration and scoring)

- 97110 (Therapeutic exercises)

- 97112 (Neuromuscular reeducation)

- 97116 (Gait training therapy)

- 97530 (Therapeutic activities)

- 90832–90838 (Psychotherapy services)

- 99483 (Assessment and care planning for patients with cognitive impairment)

- 96365–96372 (Therapeutic, prophylactic, or diagnostic injection and infusion)

CPT code selection should be based on the specific services rendered and clinical documentation.

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