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Mycobacterium avium complex (MAC) is the most common pathogen in nontuberculous mycobacterial lung diseases, but vertebral osteomyelitis caused by MAC is rare. We experienced a case of vertebral osteomyelitis with epidural abscess in a rheumatoid arthritis patient who received immunosuppressive agents. Initial assessment was tuberculous vertebral osteomyelitis, and then treated with antituberculous drugs. Fifty-six days later, Mycobacterium intracellulare was identified from abscess culture and drugs were altered to clarithromycin, rifabutin, and ethambutol. After 3 months of M. intracellulare treatment, the radiological findings showed increases of epidural abscess. According to the suseptibility, the patient received intravenous amikacin for four weeks, and then, oral ciprofloxacin in addition to clarithromycin, rifabutin, and ethambutol. The patient is being treated with the medication for 13 months and currently showing slow improvements.