The American Vein and Lymphatic Society offers a Registered Phlebology Review Course.
RPhS credential is the Regeistered Phlebology Sonography credential.
You can earn 10 AMA PRA CME credits if you complete the onlive review course.
You have to take and passs the CCI examination to get accredited for the RPhS credential.
https://www.myavls.org/rphs-review-course-2020.html