Per Med Learn Matters article MM7641 (revised March 2012), which I've attached, this service allows one face to face visit every week for the first month, one face to face visit every other week for months 2-6 and one face to face visit every month for months 7-12, provided the beneficiary meets a 6.6 lb. weight loss during the first 6 months. Report G0447 (Face to Face Behavioral Counseling for Obesity, 15 minutes) for each quarter hour that is documented for counseling.
Also in the article is an explanation of the requirements for this service (BMI 30.0 and over), the appropriate diagnosis, and documentation guidelines for intensive behavioral therapy (IBT) intervention, using the 5A framework (Assess, Advise, Agree, Assist, Arrange).
So, in typical CMS style, you have to meet certain criteria and document carefully within a pre-determined framework in order to bill out these services. It's so labor intensive at this point, that my physicians felt the work involved in designing an EHR template wasn't worth the reimbursement.