G21.8 – Other secondary parkinsonism
ICD-10-CM 2027 diagnosis code · Extrapyramidal and movement disorders
ICD-10-CM code
G21.8
- Code
G21.8(claims format:G218)- Description
- Other secondary parkinsonism
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G20-G26 Extrapyramidal and movement disorders
- Parent codes
- G21
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G21 – Secondary parkinsonism
Index terms for G21.8
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in G21
- G21.0 – Malignant neuroleptic syndromeBillable
- G21.1 – Other drug-induced secondary parkinsonismHeader
- G21.2 – Secondary parkinsonism due to other external agentsBillable
- G21.3 – Postencephalitic parkinsonismBillable
- G21.4 – Vascular parkinsonismBillable
- G21.9 – Secondary parkinsonism, unspecifiedBillable
Frequently asked questions
What is ICD-10 code G21.8?
G21.8 is the ICD-10-CM code for other secondary parkinsonism, in the block G20-G26 (Extrapyramidal and movement disorders).
Is G21.8 a billable code?
Yes. G21.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G21.8 belong to?
It belongs to category G21 – Secondary parkinsonism.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.