G20.C Parkinsonism, unspecified
The ICD-10-CM code for Parkinsonism, unspecified is G20.C (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- G20-G26: Extrapyramidal and movement disorders (G20-G26)
- Category G20
- 8 codes (5 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to G20.C:
- Hemiparkinsonism
- Parkinsonism (idiopathic) (primary)
- Pyramidopallidonigral syndrome
- Parkinsonism (idiopathic) (primary) › dementia
- Paralysis, paralytic (complete) (incomplete) › agitans
- Syndrome › pyramidopallidonigral
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › in (due to) › paralysis agitans
- Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety) › with › Parkinsonism
Inclusion Terms
- Parkinsonism, NOS
U.S. Hospital Utilization
- An estimated 11,205 U.S. inpatient stays in 2023 included G20.C among the documented diagnoses.
- 530 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Prevalence & Statistics
- Based on 2012 data, an estimated 60,000 to 95,000 adults aged 45 and older are newly diagnosed with Parkinson's disease each year in North America, with U.S. Medicare data alone indicating nearly 90,000 new diagnoses per year among adults aged 65 and older. (Incidence of Parkinson disease in North America, npj Parkinson's Disease (NIH National Library of Medicine, PubMed Central), 2012)
Official Coding Guidelines
Dominant/nondominant side (TOC entry)a. Dominant/nondominant side ................................................................................................. 45
Pain - Category G89 (TOC entry)b. Pain - Category G89.............................................................................................................. 45
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026
References
- CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
- CDC/NCHS — ICD-10-CM Files and Browser Tool
- AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)
- Incidence of Parkinson disease in North America, npj Parkinson's Disease (NIH National Library of Medicine, PubMed Central) (2012)