Help Center / How is a State of Principal License defined?


  • The “State of Principal License” (SPL) is the Compact member state where a physician holds a license to practice medicine, and which has been designated as such by the physician for purposes of registration and participation in the Compact. The SPL is a state in which a physician holds a full and unrestricted license.
  • medical license. The SPL is also sometimes called a “home state” or “primary state of licensure.”