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99396 is a CPT code, not an ICD9 code. The ICD9 code you use will depend on the condition or reason for the visit.
99396
Periodic comprehensive preventive medicine
preventative medicine, age 40-64
preventative medicine, age 40-64
Cdt code for ridge split
insurance biller
MTAD is just an irrgiant using during the endodontic procedure. There would be no code for it, it was just be included in the root canal fee and code.
Modifier 59 is used to represent a different session or patient encounter, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same physician. You would not use modifier 59 on an E&M service such as 99396.
99396
CPT Code 99396 -Periodic comprehensive preventive medicine reevaluation and management of an individual including an age and gender appropriate history, examination, counseling/anticipatory guidance/risk factor reduction interventions, and the ordering of laboratory/diagnostic procedures, established patient; 40-64 years.