Employee and Employer Contributions
Employee contributions are typically 100% vested immediately, but employer contributions may be subject to a vesting schedule. That means your share as the alternate payee could be limited to only the vested portion your ex-spouse has earned by the time of the divorce or QDRO.
The QDRO should specify whether it applies to just the vested portion or future vesting as well. Most plans, including the Rio Grande Hospital 403b Plan, will only recognize benefits already vested at the time the QDRO is processed.

