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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 membershiprequests@unos.org.

As of September 3, 2014, OPTN membership included the following:
(Click on the member type to search for individual members.)

Type of OPTN Member Number
Transplant Centers 245
Organ Procurement Organizations ** 58
Independent 51  
Hospital Based 7  
Histocompatibility Laboratories ** 155
Independent 57  
Hospital Based 98  
Public Organizations 7
Individual Members 7
Medical Scientific Organizations 15
Business Members 3
Total 385

** NOTE: There are 7 OPTN members that operate both transplant centers and in-house OPOs and 98 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.