2017/18 ICD-10-CM Diagnosis Code G21.11

Neuroleptic induced parkinsonism

Use Additional
Use Additional Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • code for adverse effect, if applicable, to identify drug (
    ICD-10-CM Diagnosis Code T43.3X5

    Adverse effect of phenothiazine antipsychotics and neuroleptics

      2016 2017 2018 Non-Billable/Non-Specific Code
    T43.3X5
    ,
    ICD-10-CM Diagnosis Code T43.4X5

    Adverse effect of butyrophenone and thiothixene neuroleptics

      2016 2017 2018 Non-Billable/Non-Specific Code
    T43.4X5
    ,
    ICD-10-CM Diagnosis Code T43.505

    Adverse effect of unspecified antipsychotics and neuroleptics

      2016 2017 2018 Non-Billable/Non-Specific Code
    T43.505
    ,
    ICD-10-CM Diagnosis Code T43.595

    Adverse effect of other antipsychotics and neuroleptics

      2016 2017 2018 Non-Billable/Non-Specific Code
    T43.595
    )
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as G21.11. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • malignant neuroleptic syndrome (
    ICD-10-CM Diagnosis Code G21.0

    Malignant neuroleptic syndrome

      2016 2017 2018 Billable/Specific Code
    Type 1 Excludes
    • neuroleptic induced parkinsonism (G21.11)
    Use Additional
    G21.0
    )
The following code(s) above G21.11 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to G21.11:
  • G00-G99
    2018 ICD-10-CM Range G00-G99

    Diseases of the nervous system

    Type 2 Excludes
    • 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)
    Diseases of the nervous system
  • G21
    ICD-10-CM Diagnosis Code G21

    Secondary parkinsonism

      2016 2017 2018 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • dementia with Parkinsonism (G31.83)
    • Huntington's disease (G10)
    • Shy-Drager syndrome (G90.3)
    • syphilitic Parkinsonism (A52.19)
    Secondary parkinsonism
ICD-10-CM G21.11 is grouped within Diagnostic Related Group(s) (MS-DRG v35.0):

Convert G21.11 to ICD-9-CM

Code History
Code annotations containing back-references to G21.11:

Diagnosis Index entries containing back-references to G21.11:

ICD-10-CM Codes Adjacent To G21.11
G13 Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere
G13.0 Paraneoplastic neuromyopathy and neuropathy
G13.1 Other systemic atrophy primarily affecting central nervous system in neoplastic disease
G13.2 Systemic atrophy primarily affecting the central nervous system in myxedema
G13.8 Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere
G14 Postpolio syndrome
G20 Parkinson's disease
G21 Secondary parkinsonism
G21.0 Malignant neuroleptic syndrome
G21.1 Other drug-induced secondary parkinsonism
G21.11 Neuroleptic induced parkinsonism
G21.19 Other drug induced secondary parkinsonism
G21.2 Secondary parkinsonism due to other external agents
G21.3 Postencephalitic parkinsonism
G21.4 Vascular parkinsonism
G21.8 Other secondary parkinsonism
G21.9 Secondary parkinsonism, unspecified
G23 Other degenerative diseases of basal ganglia
G23.0 Hallervorden-Spatz disease
G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
G23.2 Striatonigral degeneration

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.