NCAS- Provider of Choice. NCAS is a Third Party Administrator (TPA) based in Baltimore, Maryland. With offices in Maryland, Virginia and North Carolina, NCAS is focused on working with employers and brokers to offer cost effective health and benefits options to its employees. By providing access to the CareFirst® BlueCross BlueShield provider network as well as many other PPO networks across the country, NCAS offers a nationwide option for TPA services. We can support a full range of benefits including medical, dental, vision, FSA and HSA options.