Chronic Kidney Disease Improvement in Research and Treatment Act This bill expands, establishes, and otherwise modifies requirements under Medicare and other health care programs relating to individuals with end-stage renal disease (ESRD). Among other things, the bill expands the scope of the National Health Service Corps to specifically include kidney disease specialists, modifies payments under the Medicare ESRD program to exclude certain adjustment factors (e.g., comorbidities), authorizes incentive payments for renal dialysis facilities that exceed performance standards under the Medicare ESRD program, and expands guaranteed issue rights with respect to Medigap policies (Medicare supplemental health insurance policies) to all ESRD beneficiaries.