Currently, every transplant hospital program, organ procurement organization, and histocompatibility laboratory in the United States is an OPTN member. Membership means that their transplant programs are certified by UNOS, and that they play an active role in forming the policies that govern the transplant community.

Other OPTN members include: voluntary health organizations, such as the American Diabetes Association; general public members, such as ethicists and donor family members; and medical professional/scientific organizations, such as the American Medical Association.

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

OPTN members are responsible for notifying membership of changes or errors in staffing or links appearing in this directory. Please send additions, changes or concerns to

As of April 30, 2016, OPTN membership included the following:
(Click on the member type to search for individual members.)

OPTN Membership
Type of OPTN Member Number
Transplant Centers 248
Organ Procurement Organizations  58
Independent 51  
Hospital Based 7  
Histocompatibility Laboratories  155
Independent 56  
Hospital Based 99  
Public Organizations 7
Individual Members 11
Medical Scientific Organizations 14
Business Members 3
Total 390

 NOTE: There are 7  OPTN members that operate both transplant centers and in-house OPOs and 99 that operate both transplant centers and in-house histocompatibility laboratories. These members are included in the count of transplant centers, operating OPOs, and/or laboratories. For this reason, the total number of members is less than the sum of the different categories.