Currently, every transplant hospital program, organ procurement organization, and transplant histocompatibility laboratory in the United States is an OPTN member. Membership means that their institution meets OPTN requirements 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 National Kidney Foundation; general public members, such as ethicists and donor family members; and medical professional/scientific organizations, such as the American Society for Transplantation.
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 the OPTN Membership team of changes or errors in staffing or links appearing in this directory. To make changes to the below directory, of if you’d like to apply to be an OPTN member, email membershiprequests@unos.org.
Member actions
Learn more about member actions:
- Members Not in Good Standing (MNIGS)
- Probation
OPTN membership
As of November 4, 2025, OPTN membership included the following:
| Type of OPTN Member | Number |
|---|---|
| Transplant Hospitals | 252 |
| Organ Procurement Organizations* | 55 |
| Independent | 48 |
| Hospital Based | 7 |
| Histocompatibility Laboratories* | 137 |
| Independent | 48 |
| Hospital Based | 89 |
| Public Organizations | 10 |
| Individual Members | 15 |
| Medical Scientific Organizations | 11 |
| Business Members | 54 |
| Total | 438 |
*Note: There are seven OPTN members that operate both transplant hospitals and in-house OPOs and 89 that operate both transplant hospitals and in-house histocompatibility laboratories. These members are included in the count of transplant hospitals, operating OPOs, and/or laboratories. For this reason, the total number of members is less than the sum of the different categories.
Download the OPTN member list.