G05 — Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere
Is G05 billable?
No — G05 is a non-billable header code. G05 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 2 billable codes beneath G05.
Billable codes under this header
G05 at a glance
| Code | G05 |
|---|---|
| Description | Encephalitis, myelitis and encephalomyelitis in diseases classified elsewhere |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with G05 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- adenoviral encephalitis, myelitis and encephalomyelitis (A85.1)
- encephalitis, myelitis and encephalomyelitis (in) measles (B05.0)
- enteroviral encephalitis, myelitis and encephalomyelitis (A85.0)
- herpesviral [herpes simplex] encephalitis, myelitis and encephalomyelitis (B00.4)
- listerial encephalitis, myelitis and encephalomyelitis (A32.12)
- meningococcal encephalitis, myelitis and encephalomyelitis (A39.81)
- mumps encephalitis, myelitis and encephalomyelitis (B26.2)
- postchickenpox encephalitis, myelitis and encephalomyelitis (B01.1-)
- rubella encephalitis, myelitis and encephalomyelitis (B06.01)
- toxoplasmosis encephalitis, myelitis and encephalomyelitis (B58.2)
- zoster encephalitis, myelitis and encephalomyelitis (B02.0)
Code first
The underlying condition below must be sequenced before G05. G05 describes a manifestation and cannot be the principal or first-listed diagnosis.
- underlying disease, such as:
- congenital toxoplasmosis encephalitis, myelitis and encephalomyelitis (P37.1)
- cytomegaloviral encephalitis, myelitis and encephalomyelitis (B25.8)
- encephalitis, myelitis and encephalomyelitis (in) systemic lupus erythematosus (M32.19)
- eosinophilic meningoencephalitis (B83.2)
- human immunodeficiency virus [HIV] disease (B20)
- poliovirus (A80.-)
- suppurative otitis media (H66.01-H66.4)
- systemic lupus erythematosus (M32.19)
- trichinellosis (B75)
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G05, but a patient may have both at the same time. When documentation supports it, G05 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)
What codes fall under G05? (2)
How long has G05 existed?
G05 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 G05?
ICD-10-CM declares these codes mutually exclusive with G05 — exactly one of each pair can be correct for a given encounter.