G21.8
BillableOther secondary parkinsonism
Other secondary parkinsonism
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
Related Codes(6)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(32)
SNOMED CT
- Parkinsonism with calcification of basal ganglia230295005
- Parkinsonism co-occurrent and due to acute infection722556003
- Parkinsonism in acute infection722556003
- Parkinsonism due to human immunodeficiency virus infection722557007
- Parkinsonism following infection722558002
- Post-infectious Parkinsonism722558002
- Parkinsonism due to hereditary spastic paraplegia722599008
- Parkinsonism due to heredodegenerative disorder722965000
- Infection causing parkinsonism724546003
- Infectious parkinsonism724546003
- Parkinsonism due to and following injury of head724762006
- Post-traumatic parkinsonism724762006
- Parkinsonism due to mass lesion of brain724763001
- Parkinsonism due to prion disease1176989007
- Parkinsonism following Mycoplasma infection1176991004
Clinical Terms
- Parkinsonism due to prion disease
- Parkinsonism due to and following injury of head
- Parkinsonism due to mass lesion of brain
- Parkinsonism co-occurrent and due to acute infection
- Parkinsonism due to heredodegenerative disorder
- Parkinsonism due to human immunodeficiency virus infection
- Parkinsonism following infection
- Parkinsonism due to hereditary spastic paraplegia
- Parkinsonism following Mycoplasma infection
- Infection causing parkinsonism
- Post-infectious Parkinsonism
- Parkinsonism with calcification of basal ganglia
- Parkinsonism in acute infection
- Infectious parkinsonism
- Post-traumatic parkinsonism
Frequently Asked Questions
What is the ICD-10 code for other secondary parkinsonism?
The ICD-10-CM code for other secondary parkinsonism is G21.8. The full clinical description is "Other secondary parkinsonism". G21.8 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code G21.8 mean?
ICD-10-CM code G21.8 represents “Other secondary parkinsonism”. It is classified under Chapter 6: Diseases of the Nervous System and is a billable/specific code that can be used on a claim.
Is G21.8 a billable code?
Yes, G21.8 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is G21.8 in?
G21.8 is in Chapter 6: Diseases of the Nervous System (codes G00-G99).
What codes cannot be used with G21.8?
G21.8 has Excludes1 notes indicating codes that cannot be used together with it, including: Huntington's disease (G10); neurocognitive disorder with Lewy bodies (G31.83); Shy-Drager syndrome (G90.3); and 1 more.
What SNOMED CT codes does G21.8 map to?
G21.8 maps to 11 SNOMED CT concepts: 724546003, 722556003, 724762006, 722599008, 722965000, and 6 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for G21.8?
G21.8 is linked to 1 UMLS Concept Unique Identifier: C0477357. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does G21.8 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like other secondary parkinsonism affect a person's functioning: body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of G21.8?
G21.8 maps to the ICD-11 code: 8A00.2Z (Secondary parkinsonism, unspecified).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.