ICD-9-CM Vol. 1 Diagnostic Codes

6. DISEASES OF THE NERVOUS SYSTEM AND SENSE ORGANS (320-389)

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INFLAMMATORY DISEASES OF THE CENTRAL NERVOUS SYSTEM (320-327)

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323 Encephalitis, myelitis, and encephalomyelitis

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Code(s)	Description
323.01‑323.02	323.0 Encephalitis, myelitis, and encephalomyelitis in viral diseases classified elsewhere
323.1	RICKETTSIAL ENCEPHALITIS
323.2	PROTOZOAL ENCEPHALITIS
323.41‑323.42	323.4 Other encephalitis, myelitis, and encephalomyelitis due to infection classified elsewhere
323.51‑323.52	323.5 Encephalitis, myelitis, and encephalomyelitis following immunization procedures
323.61‑323.63	323.6 Postinfectious encephalitis, myelitis, and encephalomyelitis
323.71‑323.72	323.7 Toxic encephalitis, myelitis, and encephalomyelitis
323.81‑323.82	323.8 Other causes of encephalitis, myelitis, and encephalomyelitis
323.9	ENCEPHALITIS NOS