G04.9 Encephalitis, myelitis and encephalomyelitis, unspecified

Non-billable header with 2 child codes.

Applies from G04 Encephalitis, myelitis and encephalomyelitis

Includes

• acute ascending myelitis
• meningoencephalitis
• meningomyelitis

Excludes1 (never code together)

• encephalopathy NOS (G93.40)

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)

Codes under G04.9

• G04.90 Encephalitis and encephalomyelitis, unspecified
• G04.91 Myelitis, unspecified

Code annotations containing back-references to G04.9

Back-references to G04

• Type 1 Excludes: G03 Meningitis due to other and unspecified causes ("meningoencephalitis (G04.-)")
• Type 1 Excludes: G03 Meningitis due to other and unspecified causes ("meningomyelitis (G04.-)")
• Type 2 Excludes: G95 Other and unspecified diseases of spinal cord ("myelitis (G04.-)")

Nearby codes

• G04.39 Other acute necrotizing hemorrhagic encephalopathy
• G04.8 Other encephalitis, myelitis and encephalomyelitis
• G04.81 Other encephalitis and encephalomyelitis
• G04.82 Acute flaccid myelitis
• G04.89 Other myelitis
• G04.9 Encephalitis, myelitis and encephalomyelitis, unspecified (this code)
• G04.90 Encephalitis and encephalomyelitis, unspecified
• G04.91 Myelitis, unspecified