G04.81 – Other encephalitis and encephalomyelitis

ICD-10-CM 2027 diagnosis code · Inflammatory diseases of the central nervous system

Billable code

ICD-10-CM code G04.81
Code
G04.81 (claims format: G0481)
Description
Other encephalitis and encephalomyelitis
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
6. Diseases of the nervous system (G00-G99)
Block
G00-G09 Inflammatory diseases of the central nervous system
Parent codes
G04 › G04.8

Notes for G04.81

Applicable to:
  • Noninfectious acute disseminated encephalomyelitis (noninfectious ADEM)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

G04 – Encephalitis, myelitis and encephalomyelitis

Includes:
  • acute ascending myelitis
  • meningoencephalitis
  • meningomyelitis
Excludes1 (not coded here):
Excludes2 (not included here):
  • acute transverse myelitis (G37.3)
  • alcoholic encephalopathy (G31.2)
  • multiple sclerosis (G35-)
  • myalgic encephalomyelitis (G93.32)
  • subacute necrotizing myelitis (G37.4)
  • toxic encephalitis (G92.8)
  • toxic encephalopathy (G92.8)

G04.8 – Other encephalitis, myelitis and encephalomyelitis

Code also:

Index terms for G04.81

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in G04.8

Frequently asked questions

What is ICD-10 code G04.81?

G04.81 is the ICD-10-CM code for other encephalitis and encephalomyelitis, in the block G00-G09 (Inflammatory diseases of the central nervous system).

Is G04.81 a billable code?

Yes. G04.81 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does G04.81 belong to?

It belongs to category G04 – Encephalitis, myelitis and encephalomyelitis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.