ICD-10-CM G20: Parkinson's disease

ICD-10-CM Diagnosis Code (2025)

Official Description for G20

Parkinson's disease

Coding Notes & Guidelines for G20

Excludes1: Not Coded Here

drug induced dystonia (G24.0-)

Excludes1: Not Coded Here
  • Parkinson's disease NOS (G20.A1)
  • Parkinson's disease with dyskinesia (G20.B-)
  • Parkinson's disease without dyskinesia (G20.A-)
  • secondary parkinsonism (G21.-)
Use Additional Code
  • 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-)
Inclusion Terms
  • Hemiparkinsonism
  • Idiopathic Parkinsonism or Parkinson's disease
  • Paralysis agitans
  • Primary Parkinsonism or Parkinson's disease
Inclusion Terms
  • Parkinson's disease NOS
  • Parkinson's disease without dyskinesia, without mention of OFF episodes
Inclusion Terms

Parkinson's disease without dyskinesia, with OFF episodes

Inclusion Terms

Parkinson's disease with dyskinesia, without mention of OFF episodes

Inclusion Terms

Parkinson's disease with dyskinesia, with OFF episodes

Inclusion Terms

Parkinsonism, NOS

Child Codes (More Specific Codes for G20):

G20.A - Parkinson's disease without dyskinesia G20.A1 - Parkinson's disease without dyskinesia, without mention of fluctuations G20.A2 - Parkinson's disease without dyskinesia, with fluctuations G20.B - Parkinson's disease with dyskinesia G20.B1 - Parkinson's disease with dyskinesia, without mention of fluctuations G20.B2 - Parkinson's disease with dyskinesia, with fluctuations G20.C - Parkinsonism, unspecified

About ICD-10-CM Code G20 (Parkinson's disease)

ICD-10-CM code G20 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM G20 became effective on October 1, 2024.

This page provides detailed information about G20 - Parkinson's disease. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Parkinson's disease.