A derived field providing the primary care trust responsible for the patient.

Commissioning responsibility for individual patients rests with the primary care trust (PCT) with whom the patient is registered. This means that patients with a GP in one PCT area may reside in a neighbouring or other area but remain the responsibility of the PCT with whom their GP of registration is associated. PCTs are also responsible for non-registered patients who are resident within their boundaries.

nan, naa or aaa = Primary care trust

59898 = Not applicable

59999 = Unknown