The modifier 93 (Synchronous Telemedicine Service Rendered Via Telephone or Other Real-Time Interactive Audio-Only Telecommunications System).
The alphabetic index is not a substitute for the main text of the CPT codebook. Even if only one code is present, the coder must refer to the main term to ensure that the code is selected accurately and correctly to identify the services rendered. Main Terms The index is organized by main terms. Each main term can stand alone or can be followed by up to three modifying terms. There are four primary classes of main entries, Procedures or Services - E.g, Scopic, Anastomosis, Splint, Opening Organ or Other Anatomical Site - E.g, Knee, Arm, Ear, Tibia, Colon Conditions - E.g, Abscess, Entropion, Tetralogy of Fallot. Synonyms, Eponyms, and Abbreviations. - ECG, EEG, PET, Brock Operations, Clagett Procdures Modifying Terms The main term may be followed by up to three indented terms that modify the terms they follow. EG. The main term "Endoscopy" is subdivided by the anatomical sites in which the procedure is used. And within these anatomical sites, the specific purpose of the pr