Matching organs. Saving lives.


Member organizations

Transplant hospitals, organ procurement organizations (OPOs) and histocompatibility laboratories in the United States all belong to UNOS. Voluntary health organizations, such as the American Diabetes Association; general public members, such as ethicists, transplant recipients and donor family members; and medical professional and scientific organizations, such as the American Medical Association also belong. Members play an active role in forming the policies that govern the transplant community.

View member organizations

UNOS has seven classes of membership:

  • Institutional members, including transplant hospitals, OPOs and histocompatibility labs
  • Medical/scientific members
  • Public organization members
  • Business members
  • Individual members


The US is divided into 11 geographic regions to facilitate transplantation. In each region, a regional councillor, an associate regional councillor, and a staff administrator work together to coordinate regional activities such as regional meetings and regional education events for transplant professionals. Each region is represented by a regional councillor on the Board of Directors and has a representative on each of the standing committees.

OPTN/UNOS regional map

Puerto Rico (Region 3) | Washington, DC (Region 2)


Apply for OPTN/UNOS membership

The detailed descriptions for the categories of membership are described in the UNOS By-Laws, Article I. Membership means that upon completion of the prescribed application process and satisfaction of applicable requirements, the organization has demonstrated compliance with all applicable UNOS membership criteria.

Individuals from member organizations participate in the decision-making process through representation on committees and on the Board of Directors.

How to apply for OPTN/UNOS membership

Regional administrators

UNOS' regional administrators are your liaison to everything about UNOS and the OPTN. If you have a question about implementing transplant policy or related member questions, contact your regional administrator.

Ross Walton, UNOS regional administrator
REGIONS 2, 6, 7, 10
Ross Walton
(804) 782-4942
Tina Rhoades, UNOS regional administrator
REGIONS 3, 5, 11
Tina Rhoades
(804) 782-1551
Share This