Nomad Health, a startup that connects medical facilities with freelance doctors and nurses, just raised an additional $12 million. So far, Nomad's used in 12 states by about 30,000 doctors. The aim with this additional funding is to continue the geographic expansion, with the goal of being in all 50. Connecting doctors to hospitals that need them in the US is critical, especially as the country is expected to face a shortage of 90,000 physicians by 2025.