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HomeICD-10 CodesG21
ICD-10-CM
Billable

G21

Classification
Category:
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Coding Guidance
Coding Guidance G21 should not be used for reimbursement purposes as there are more specific codes below it that contain a greater level of detail. See Related Codes to drill down to more specific billable codes for appropriate reimbursement.
Excludes 1
From
  • Huntington's disease ( G10 )
  • neurocognitive disorder with Lewy bodies ( G31.83 )
  • Shy-Drager syndrome ( G90.3 )
  • syphilitic Parkinsonism ( A52.19 )
Excludes 2
From
  • certain conditions originating in the perinatal period ( P04-P96 )
  • certain infectious and parasitic diseases ( A00-B99 )
  • complications of pregnancy, childbirth and the puerperium ( O00- O9A )
  • congenital malformations, deformations, and chromosomal abnormalities ( Q00-Q99 )
  • endocrine, nutritional and metabolic diseases ( E00-E88 )
  • injury, poisoning and certain other consequences of external causes ( S00-T88 )
  • neoplasms ( C00-D49 )
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified ( R00-R94 )

More Specific Codes

G21.0
Malignant neuroleptic syndrome G21.0
G21.1
Other drug-induced secondary parkinsonism G21.1
G21.2
Secondary parkinsonism due to other external agents G21.2
G21.3
Postencephalitic parkinsonism G21.3
G21.4
Vascular parkinsonism G21.4
G21.8
Other secondary parkinsonism G21.8
G21.9
Secondary parkinsonism, unspecified G21.9
G00-G99
G00-G99 - Diseases of the nervous system

External Resources

2025 ICD-10 guidelines from CMS.gov