ICD-10-CM › G00-G99 › G20-G26 › G21 Secondary parkinsonism › G21.9
Secondary parkinsonism, unspecified
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Secondary parkinsonism, unspecified
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from G21 Secondary parkinsonism
Excludes1 - never coded here
- Huntington's disease (G10)
- neurocognitive disorder with Lewy bodies (G31.83)
- Shy-Drager syndrome (G90.3)
- syphilitic Parkinsonism (A52.19)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Palsy > shaking
- Pill roller hand
- Trembling paralysis
- Tremor > Parkinson's
- Syndrome > Parkinson's
- Syndrome > parkinsonian
- Shaking palsy or paralysis
- Syndrome > paralysis agitans
- Paralysis, paralytic > agitans
- Paralysis, paralytic > shaking
- Parkinson's syndrome or tremor
- Paralysis, paralytic > trembling
- Parkinsonism > secondary
Codes in the same group
| Code | Description | Status |
|---|---|---|
| G21.0 | Malignant neuroleptic syndrome | Valid |
| G21.1 | Other drug-induced secondary parkinsonism | Not billable |
| G21.2 | Secondary parkinsonism due to other external agents | Valid |
| G21.3 | Postencephalitic parkinsonism | Valid |
| G21.4 | Vascular parkinsonism | Valid |
| G21.8 | Other secondary parkinsonism | Valid |