ICD-10 G20
Non-Billable HeaderParkinson's disease
About ICD-10-CM G20
ICD-10-CM code G20 represents Parkinson's disease. This is a non-billable header code in the Nervous System chapter (block G20). The 2026 edition of ICD-10-CM G20 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under G20. Per CMS ICD-10-CM Tabular 2026.
- Hemiparkinsonism
- Idiopathic Parkinsonism or Parkinson's disease
- Paralysis agitans
- Primary Parkinsonism or Parkinson's disease
Use Additional Code
When coding G20, also report these additional codes when applicable.
- code, if applicable, to identify:
- dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
- dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
- dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
- dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
- dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
- mild neurocognitive disorder due to known physiological condition (F06.7-)
Medicare LCD Coverage for G20
Local Coverage Determinations (LCDs) from CMS MACs that list G20 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G20.
1 Cigna
1 Humana
CPT Codes Commonly Billed with G20
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 97112 Neuromuscular reeducation — hemiplegia, paraplegia, cerebral palsy, post-stroke, gait abnormality, ataxia, MS, Parkinson, concussion, hx TBI Physical Therapy
- 97163 PT evaluation high complexity — hemiplegia, paraplegia, post-stroke, MS, Parkinson, TBI, fracture, post-replacement Physical Therapy
Convert G20 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| G20 | 3320 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G20
Other codes in section G20-G26 (Extrapyramidal and movement disorders).
ICD-10 G20, Billing FAQ
Is ICD-10 code G20 billable? +
No, G20 is a non-billable header code. Use a more specific child code from block G20 when submitting claims.
What other names or terms map to G20? +
ICD-10 G20 includes: Hemiparkinsonism; Idiopathic Parkinsonism or Parkinson's disease; Paralysis agitans, and 1 more clinical synonyms.
What CPT codes are commonly billed with G20? +
Procedures frequently paired with G20 include: 97112, 97163.
What ICD-9 codes does G20 map to? +
Per CMS GEMs, G20 maps to ICD-9 codes: 3320. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 17, 2026.
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