G94 — Other disorders of brain in diseases classified elsewhere
Is G94 billable?
Yes — G94 is billable for FY2027. G94 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. G94 may be submitted for encounters from October 1, 2026 through September 30, 2027.
G94 at a glance
| Code | G94 |
|---|---|
| Description | Other disorders of brain in diseases classified elsewhere |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What Medicare edits apply to G94?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name G94 directly.
This code describes a manifestation of an underlying disease. The underlying condition must be sequenced before it, so it can never be the principal or first-listed diagnosis.
Which MS-DRGs does G94 group to?
G94 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
How is G94 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to G94. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Encephalopathy › posthypoglycemic (acute)
- Epilepsy, epileptic, epilepsia › parasitic NOS (attack) (cerebral) (convulsion) (fit) (seizure)
- Malaria, malarial › cerebral (fever)
- Typhus › brain (fever)
- Typhus › cerebral (fever)
- Cyst › brain › hydatid (colloid) (mucous) (simple) (retention)
- Cyst › hydatid › brain (colloid) (mucous) (simple) (retention)
- Disease, diseased › brain › parasitic NEC
- Disease, diseased › parasitic › cerebral NEC
- Encephalopathy › in › hyperinsulinism (acute)
- Hyperinsulinism › with › encephalopathy (functional)
- Malaria, malarial › falciparum › with complications NEC › cerebral (fever)
Excludes1 — never code together
The conditions below can never be reported together with G94 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Code first
The underlying condition below must be sequenced before G94. G94 describes a manifestation and cannot be the principal or first-listed diagnosis.
- underlying disease
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G94, but a patient may have both at the same time. When documentation supports it, G94 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 G94 existed?
G94 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.
Which codes are confused with G94?
ICD-10-CM declares these codes mutually exclusive with G94 — exactly one of each pair can be correct for a given encounter.