2027 ICD-10-CM Diagnosis Code G94Other disorders of brain in diseases classified elsewhere
ICD-10-CM Codes›G00–G99›G89-G99›G94
- Billable — Valid for Submission
- Not Chronic
G94 is a billable ICD-10-CM diagnosis code for other disorders of brain in diseases classified elsewhere. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 56 through 57. The code is a manifestation code that cannot be reported as the principal diagnosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for G94.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Autoimmune thyroiditis
- Cortical blindness
- Developmental and epileptic encephalopathy
- Early-onset epileptic encephalopathy, cortical blindness, intellectual disability, facial dysmorphism syndrome
- Encephalopathy caused by monkeypox virus
- Epileptic encephalopathy
- FASTKD2-related infantile mitochondrial encephalomyopathy
- GRIN2A developmental and epileptic encephalopathy
- Human immunodeficiency virus encephalopathy
- Hydatid cyst of brain
- Hydatid cyst of cerebrum
- Inborn error of amino acid metabolism
- Infantile epileptic dyskinetic encephalopathy
- Infection causing cyst of central nervous system
- Infection of central nervous system caused by Echinococcus
- Intracranial hypotension
- Intracranial hypotension due to lumbar puncture
- Intracranial infectious cyst
- Larval echinococcosis
- Mitochondrial short-chain enoyl-CoA hydratase 1 deficiency disorder
- Neurological disorder due to and following lumbar puncture
- RNF13-related severe early-onset epileptic encephalopathy
- Steroid-responsive encephalopathy associated with autoimmune thyroiditis
- SYNGAP1-related developmental and epileptic encephalopathy
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G94: its own notes plus those printed at Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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)
Code First
The underlying condition named in the note is sequenced before this code.
- underlying disease
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name G94, its category, or a range that includes it.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G94 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G94Overview
What is the ICD-10 code for other disorders of brain in diseases classified elsewhere?
The ICD-10-CM code for other disorders of brain in diseases classified elsewhere is G94. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G94 (Other disorders of brain in diseases classified elsewhere) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of brain in diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G94 group to?
On inpatient claims, other disorders of brain in diseases classified elsewhere maps to MS-DRG 57, 56, with relative weights from 1.2835 to 2.2649 depending on complications. Higher weights mean higher Medicare reimbursement.
Can G94 be a principal diagnosis?
No. This is a manifestation code: other disorders of brain in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.
Can G94 be reported with A50.49?
Not as a rule. The Excludes1 note on G94 lists "encephalopathy in congenital syphilis (A50.49)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
