Bundling and Coordinating Post-Acute Care Act of 2015 or the BACPAC Act of 2015

Amends title XVIII (Medicare) of the Social Security Act to require a single bundled payment for post-acute care services under Medicare parts A (Hospital Insurance) and B (Supplementary Medical Insurance).

Defines "PAC physician" as the physician with primary responsibility for supervising delivery to an individual of a post-acute care (PAC) bundle of services between a qualifying discharge and the earlier of: (1) 90 days later, or (2) the date on which the individual is admitted to a hospital to receive services for a condition unrelated to the one for which he or she received the acute care inpatient hospital services.

Directs the Secretary of Health and Human Services to study the feasibility of integrating ("bundling") all payments under the Medicare program for post acute care services with payments for acute care inpatient hospital services in a subsection (d) hospital. (Generally, a subsection [d] hospital is an acute care hospital, particularly one that receives payments under Medicare's inpatient prospective payment system [IPPS] when providing covered inpatient services to eligible beneficiaries.)

Places a moratorium on the IPPS payment rate in certain cases.

Directs the Secretary to: (1) establish a new Transitional Care Management (TCM) code, with respect to geographic adjustments to the physicians' fee schedule, to pay for care management by a PAC physician; or (2) revise and expand the use of existing TCM codes 99495 and 99494.