Hi Guest! Great question. As you mentioned, some medical insurers will accept the new patient E&M codes 99201-99205 with the GT modifier appended. Some insurers state in their policy for new patient E&M telemedicine visits, you should use: 99499 – Unlisted evaluation and management service Modifier: GT For established patient telemedicine visits, the CPT codes are as follows: • 99421: Online digital evaluation and management service, for an established patient, for up to 7 days, cumulative time during the 7 days; 5–10 minutes • 99422: Online digital evaluation and management service, for an established patient, for up to 7 days cumulative time during the 7 days; 11– 20 minutes • 99423: Online digital evaluation and management service, for an established patient, for up to 7 days, cumulative time during the 7 days; 21 or more minutes. Place of service 02 for telehealth for any of these 🙂 Hope this helps!