You can also look at
this link from the Centers for Disease Control and Prevention.
This link refers to
Mycobacterium avium Complex which in essence is
Mycobacterium avium complex (comprising M. avium and M.intracellulare).
Here is a link to
Mycobacterium intracellulare.
Rick is correct in that this is a bacterial infection common among people with HIV/AIDS, or immunocompromised patients.