G21.11 — Neuroleptic induced parkinsonism
Is G21.11 billable?
Yes — G21.11 is billable for FY2027. G21.11 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G21.11 may be submitted for encounters from October 1, 2026 through September 30, 2027.
G21.11 at a glance
| Code | G21.11 |
|---|---|
| Description | Neuroleptic induced parkinsonism |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does G21.11 group to?
G21.11 sits in MDC 01 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 056Degenerative Nervous System Disorders with MCCmedical
- 057Degenerative Nervous System Disorders without MCCmedical
As a secondary diagnosis, G21.11 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is G21.11 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to G21.11. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Parkinsonism › neuroleptic induced (idiopathic) (primary)
- Parkinsonism › due to › drugs NEC › neuroleptic (idiopathic) (primary)
- Parkinsonism › secondary › due to › drugs NEC › neuroleptic (idiopathic) (primary)
Excludes1 — never code together
The conditions below can never be reported together with G21.11 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- malignant neuroleptic syndrome (G21.0)
Use additional code
Report an additional code alongside G21.11 to fully describe the condition. G21.11 is sequenced first.
Excludes1 — never code together — inherited from G21
The conditions below can never be reported together with G21.11 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G21.11, but a patient may have both at the same time. When documentation supports it, G21.11 and the excluded code may both be reported.
- 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)
How long has G21.11 existed?
G21.11 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.