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ICD-10-CM Codes G00-G99 G20-G26 G20 G20.A1
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2025 Parkinson Disease ICD 10 Code G20.A1

Effective Date: 10/01/2023 To 09/30/2025

Parkinson's disease without dyskinesia, without mention of fluctuations

CMS-HCC-V24 CMS-HCC-V28 RxHCC Age Gender Maternity Acute or Chronic MCC
-- -- -- -- -- -- Acute No
Applicable To for G20.A1:

  • Parkinson's disease NOS

  • Parkinson's disease without dyskinesia, without mention of OFF episodes

Back-references to G20.A1
  • Dementia(degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) F03.90
  • Disease, diseased see also Syndrome
    • Parkinson's G20.A1
      • without dyskinesia
        • without mention of
    • Chapter, Section and Diagnosis Prefix for G20.A1
      G00-G99 :

      Diseases of the nervous system

      G20-G26 :

      Extrapyramidal and movement disorders

      G20 :

      Parkinson's disease

    What is Parkinson Disease ICD 10?

    ICD 10 Code for Parkinson Disease is G20.A1 and it is a type of progressive neurological disorder that primarily affects the movement in the body. It typically occurs due to the degeneration of dopamine-producing neurons in the human brain, which leads to symptoms like tremors, stiffness, and slowed movement. It also affects other functions such as speech and cognition. While Parkinson's disease remains incurable, medications can greatly alleviate its symptoms.

    Why is Parkinson Disease ICD 10 Happening?

    Diagnosis Code for Parkinson Disease is G20.A1 and it is caused by the following reasons:

    • Dopamine-producing neurons loss in the brain.
    • Mutations in certain genes.
    • Exposure to toxins or head trauma.

    Treatment Options for Parkinson Disease ICD 10

    The treatment options that are available for this disease are as follows,

    • Medications:

      • Carbidopa-Levodopa:

        Increases dopamine levels.

      • Dopamine Agonists:

        Mimic dopamine effects.

    • Therapies:

      Physical and occupational therapy to improve movement and daily function.

    Diagnostics for Parkinson Disease ICD 10

    • Neurological Examination:

      Assessment of movement, coordination, and symptoms.

    • Imaging Tests:

      Dopamine transporter (DAT) scan test for diagnosis.

    Symptoms for Parkinson Disease ICD 10

    Some of the main signs and symptoms of the Parkinson disease include,

    • Movement symptoms: Tremors, bradykinesia, rigidity, balance issues.
    • Non-movement symptoms: Cognitive changes, sleep disorders, depression, and hallucinations.