Our pulmonary technologist is billing pulmonary rehab code G0424 for pulmonary rehab services. The previous coder states that we can bill code 93797 for the professional component of the above services, however medicare is denying this code for medical necessity. This is a cardiac rehab code and medicare is requiring a cardiac dx which our patients do not have? What code should we be billing from the professional side for our services? G0237, G0238 or G0239? Or not at all?