ICD-9 Code 013.66 - Tuberculous encephalitis or myelitis, tubercle bacilli not found by bacteriological or histological examination, but tuberculosis confirmed by other methods [inoculation of animals]

ICD-9-CM Diagnosis Code 013.66

Diagnosis Code: 013.66 (Raw: 01366)

Description: Tuberculous encephalitis or myelitis, tubercle bacilli not found by bacteriological or histological examination, but tuberculosis confirmed by other methods [inoculation of animals]

Classification: International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM)

Fiscal Year: 2026 Reference

CMS Section 111 Status: Valid for reporting.

Overview & Historical Usage

ICD-9-CM code 013.66 is designated for Tuberculous encephalitis or myelitis, tubercle bacilli not found by bacteriological or histological examination, but tuberculosis confirmed by other methods [inoculation of animals]. While superseded by ICD-10 for current healthcare encounters, it remains a recognized reference code for CMS Section 111 reporting, legacy claims adjudication, and historical clinical data analysis.