Its in the final rule, here is the fact sheet from CMS (does not mention 77427). The final rule itself is like 1000+ pages. You could download it and word search 77427 to get the language.
On November 1, 2024, the Centers for Medicare & Medicaid Services (CMS) issued a rule finalizing changes for Medicare payments under the PFS and other Medicare Part B policies, effective on or after January 1, 2025.The CY 2025 PFS final rule is one of several final rules that reflect a broader...
www.cms.gov
ASTRO and/or ACRO usually put out some kind of radiation oncology specific summary each year, but I have not seen that yet for 25.
Note, this is just for patients under medicare. Other insurances can follow these rules, or not. If you are employed, your company rules are a lot more important. I have heard some companies just don't allow telehealth anymore at all. Mine requires a special note template.
You should also check if using telehealth affects your RVUs, 77427 is a significant RVU generator for most Rad Oncs.