The American Board of Pediatrics (ABP), based in Chapel Hill, North Carolina, is responsible for certifying and recertifying general pediatricians and pediatric subspecialists in 13 subspecialties. The ABP is one of the 24 member certifying boards of the American Board of Medical Specialties. The president of the ABP, James Stockman, MD, participates in the Expert Work Group on Pediatric Subspecialty Capacity.

The National Association of Children's Hospitals (NACH), based in Alexandria, Virginia, is the public policy affiliate of the National Association of Children's Hospitals and Related Institutions. It is a trade organization of more than 133 children's hospitals across the country. It supports these hospitals in addressing policy issues, such as Medicaid and graduate medical education (GME) financing, that affect their ability to fulfill their missions of clinical care, education, research, and advocacy to meet children's health care needs. Peters Willson, vice president of public policy at NACH, participates in the Expert Work Group on Pediatric Subspecialty Capacity as do representatives from 6 of NACH's member hospitals, including Richard Azizkhan, MD from Cincinnati Children's Hospital Medical Center, Russell Chesney, MD, from Le Bonheur Children's Medical Center, Doug Jones, MD from Colorado Children's Hospital, Don Lighter, MD from Shriners Hospital for Children in Tampa, Florida, Pat Magoon, CEO of Children's Memorial Hospital in Chicago, and Richard Pan, MD, from the University of California Davis Children's Hospital.

North Carolina AccessCare, based in Morrisville, North Carolina, is one of North Carolina's primary care case management programs (PCCMs). It is a physician-owned, not-for-profit managed care organization consisting predominantly of large pediatric practices. It includes more than 250 primary care practices with more than 1,000 physicians and serves nearly 200,000 Medicaid enrollees, most of whom are children. AccessCAre is working with the state Medicaid agency, tertiary institutions in the state, and private foundations to improve access to pediatric subspecialty care in the state's Medicaid program. Steve Wegner, MD, AccessCare's president and medical director, participates in the Expert Work Group on Pediatric Subspecialty Capacity.

The Maternal and Child Health Bureau (MCHB), based in Rockville, Maryland, is part of the Health Resources and Services Administration of the Department of Health and Human Services (DHHS). It is the federal entity responsible for providing national leadership and working with states, communities, public-private partners, and families to strengthen the maternal and child health infrastructure, assure the availability and use of medical homes, and build knowledge and human resources to assure continued improvement in the health, safety, and well-being of the maternal and child health population. MCHB funds the Expert Work Group on Pediatric Subspecialty Capacity through a contract with the Maternal and Child Health Policy Research Center. Merle McPherson, MD, former director of MCHB's Division of Services for Children with Special Health Care Needs (currently senior medical advisor with DHHS' Office of Disability), Bonnie Strickland, acting director of the Division of Services for Children with Special Health Care Needs, Monique Fountain, Director of the Medical Home and Healthy and Ready to Work Initiatives, and Laura Kavanagh, chief of the training branch of the Division of Research and Training, are members of the Expert Work Group.