G20: Parkinson's disease
Codes under G20 (Parkinson's disease). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| G20.A | Parkinson's disease without dyskinesia | — |
| G20.A | Parkinson's disease without dyskinesia | — |
| G20.A1 | Parkinson's disease without dyskinesia, without mention of fluctuations | ✓ |
| G20.A1 | Parkinson's disease without dyskinesia, without mention of fluctuations | ✓ |
| G20.A2 | Parkinson's disease without dyskinesia, with fluctuations | ✓ |
| G20.A2 | Parkinson's disease without dyskinesia, with fluctuations | ✓ |
| G20.B | Parkinson's disease with dyskinesia | — |
| G20.B | Parkinson's disease with dyskinesia | — |
| G20.B1 | Parkinson's disease with dyskinesia, without mention of fluctuations | ✓ |
| G20.B1 | Parkinson's disease with dyskinesia, without mention of fluctuations | ✓ |
| G20.B2 | Parkinson's disease with dyskinesia, with fluctuations | ✓ |
| G20.B2 | Parkinson's disease with dyskinesia, with fluctuations | ✓ |
| G20.C | Parkinsonism, unspecified | ✓ |
| G20.C | Parkinsonism, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code G20?
G20 is an ICD-10-CM category covering Parkinson's disease. It contains 14 more specific diagnosis codes, 10 of which are billable.
Is G20 a billable code?
No — G20 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example G20.A — Parkinson's disease without dyskinesia). 10 of the 14 codes under G20 are billable.
What codes fall under G20?
G20 includes G20.A, G20.A, G20.A1, G20.A1, G20.A2, plus 9 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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