42 C.F.R. § 410.130
For the purposes of this subpart, the following definitions apply:
Chronic renal insufficiency means the stage of renal disease associated with a reduction in renal function not severe enough to require dialysis or transplantation (glomerular filtration rate [GFR] 15-59 ml/min/1.73m2).
Diabetes means diabetes mellitus, a condition of abnormal glucose metabolism.
Episode of care means services covered in a 12-month time period when coordinated with initial diabetes self-management training (DSMT) and one calendar year for each year thereafter, starting with the assessment and including all covered interventions based on referral(s) from a physician as specified in § 410.132(c) . The time period covered for gestational diabetes extends only until the pregnancy ends.
Medical nutrition therapy services means nutritional diagnostic, therapeutic, and counseling services provided by a registered dietitian or nutrition professional for the purpose of managing diabetes or a renal disease.
Physician means a doctor of medicine or osteopathy legally authorized to practice medicine and surgery by the State in which he or she performs such function or action (including a physician within the meaning of section of 1101(a)(7) of the Act).
Renal disease means chronic renal insufficiency, end-stage renal disease when dialysis is not received, or the medical condition of a beneficiary for 36 months after kidney transplant.
42 C.F.R. §410.130