ICD-10 codes for Parkinson Disease
Parkinson Disease is coded primarily under G20, G21, G21.11 in the ICD-10-CM (Clinical Modification) classification. Top-level categories include G20 (Parkinson's disease); G21 (Secondary parkinsonism); G23 (Other degenerative diseases of basal ganglia). The 2025 ICD-10-CM code set includes 25 codes related to parkinson disease, of which 19 are billable (specific enough to appear on a medical claim).
Parkinson disease is coded as G20 in ICD-10-CM. Secondary parkinsonism is coded under G21, with subcodes for neuroleptic-induced (G21.11), other drug-induced (G21.19), postencephalitic (G21.3), and vascular (G21.4) parkinsonism. G23.1 covers progressive supranuclear ophthalmoplegia.
Total Codes
25
Billable Codes
19
Categories
3
SNOMED CT Concepts
25+
Top 12 Relevant ICD-10 Codes
The codes most commonly assigned to parkinson disease, ranked by primary-match status, billable status, and specificity. Tap a code to see its full ICD-10 detail page.
G21.4Vascular parkinsonism
G23.1Progressive supranuclear ophthalmoplegia
G21.11Neuroleptic induced parkinsonism
G20Parkinson's disease
G21Secondary parkinsonism
G20.CParkinsonism, unspecified
G21.0Malignant neuroleptic syndrome
G21.2Secondary parkinsonism due to other external agents
G21.3Postencephalitic parkinsonism
G21.8Other secondary parkinsonism
G21.9Secondary parkinsonism, unspecified
G23.0Hallervorden-Spatz disease
Primary Code Categories
These are the top-level ICD-10-CM categories for parkinson disease. Click any code to see all specific subcodes within that group.
Billable / Specific Codes (19)
Specific ICD-10-CM codes that can be reported on medical claims for parkinson disease.
G20.A1Parkinson's dis w/o dyskinesia, w/o mention of fluctuations
G20.A2Parkinson's disease without dyskinesia, with fluctuations
G20.B1Parkinson's dis with dyskinesia, w/o mention of fluctuations
G20.B2Parkinson's disease with dyskinesia, with fluctuations
G20.CParkinsonism, unspecified
G21.0Malignant neuroleptic syndrome
G21.11Neuroleptic induced parkinsonism
G21.19Other drug induced secondary parkinsonism
G21.2Secondary parkinsonism due to other external agents
G21.3Postencephalitic parkinsonism
G21.4Vascular parkinsonism
G21.8Other secondary parkinsonism
G21.9Secondary parkinsonism, unspecified
G23.0Hallervorden-Spatz disease
G23.1Progressive supranuclear ophthalmoplegia
G23.2Striatonigral degeneration
G23.3Hypomyelination with atrophy of basal ganglia and cerebellum
G23.8Other specified degenerative diseases of basal ganglia
G23.9Degenerative disease of basal ganglia, unspecified
Cross-Mappings to Other Standards
ICD-10-CM codes for parkinson disease link to several adjacent terminologies. These mappings are precomputed from official sources (NLM RxNav, UMLS Metathesaurus, SNOMED CT International) and served via AutoICD's reference and translate APIs.
SNOMED CT
25+ concepts mapped from this code group. Concept IDs include 101421000119107, 103871000119109, 1156822001, 1259080009, ....
Browse SNOMED CT directoryUMLS Metathesaurus
25+ CUIs indexed. Sample: C0030567, C0865475, C0865476, C1399358, ....
Browse UMLS directoryICD-11
ICD-11 (WHO 2022) classifies many of these conditions under different chapter and stem-code structures. Use the converter to see specific ICD-10 to ICD-11 mappings.
Open ICD-10 to ICD-11 converterFrequently Asked Questions
What is the ICD-10 code for parkinson?
The primary ICD-10-CM codes for parkinson disease are G20, G21, G21.11. Across all sub-categories, 25 codes are grouped under parkinson disease, with 19 marked as billable (specific enough for a medical claim).
How many ICD-10 codes are there for parkinson disease?
There are 25 ICD-10-CM codes related to parkinson disease. Of these, 19 are billable specific codes and 6 are non-billable header categories that organize the specific codes underneath them. Header codes cannot be reported on a claim by themselves.
Is there a billable ICD-10 code for parkinson disease?
Yes. 19 of the 25 ICD-10-CM codes for parkinson disease are billable. Common examples include G20.A1 (Parkinson's dis w/o dyskinesia, w/o mention of fluctuations); G20.A2 (Parkinson's disease without dyskinesia, with fluctuations); G20.B1 (Parkinson's dis with dyskinesia, w/o mention of fluctuations). Code to the highest level of specificity supported by the documentation.
Which parkinson disease ICD-10 code should I use for billing?
The most commonly used billable codes for parkinson disease include: G20.A1 (Parkinson's dis w/o dyskinesia, w/o mention of fluctuations); G20.A2 (Parkinson's disease without dyskinesia, with fluctuations); G20.B1 (Parkinson's dis with dyskinesia, w/o mention of fluctuations). The correct code depends on the documented clinical presentation, including any complications, episode (acute / chronic), and laterality where applicable. Always code to the highest level of specificity supported by the clinical documentation.
Is G20 a billable ICD-10 code?
No, G20 (Parkinson's disease) is a non-billable header code. You need to use a more specific child code for billing purposes.
What are the SNOMED CT concepts for parkinson disease?
The ICD-10 codes for parkinson disease map to at least 25 SNOMED CT concepts. Examples of SNOMED CT concept IDs in this group include 101421000119107, 103871000119109, 1156822001, 1259080009, 15755701000119105. SNOMED CT is a clinical terminology used in electronic health records; AutoICD's coding API returns SNOMED CT IDs alongside each ICD-10 code via the include_snomed=true flag.
What UMLS Concept Unique Identifiers (CUIs) cover parkinson disease?
The ICD-10 codes for parkinson disease are linked to at least 25 UMLS CUIs in the National Library of Medicine's Metathesaurus. Sample CUIs include C0030567, C0865475, C0865476, C1399358, C5819118. UMLS CUIs unify the same concept across SNOMED CT, ICD-10, ICD-11, RxNorm, MeSH, and dozens of other source vocabularies.
What are other names for parkinson disease in ICD-10?
Parkinson Disease may also be referred to as: Parkinson, Parkinson disease, Parkinson's, parkinsonism, PD. The same ICD-10-CM codes apply regardless of which term appears in the clinical documentation. Synonyms are surfaced by AutoICD's NER pass and mapped to the canonical ICD-10 family above.
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