http://studentaid.ed.gov/repay-loans/understand/plans/income-based
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10-year public service loan forgiveness—If, while you are employed full-time for a public service organization, you make 120 on-time, full monthly payments under IBR (or certain other repayment plans) you may be eligible to receive forgiveness of the remaining balance of your Direct Loans through the
Public Service Loan Forgiveness Program."
"Qualifying employment is any employment with a federal, state, or local government agency, entity, or organization or a not-for-profit organization that has been designated as tax-exempt by the Internal Revenue Service (IRS) under Section 501(c)(3) of the Internal Revenue Code (IRC). The type or nature of employment with the organization does not matter for PSLF purposes. Additionally, the type of services that these public service organizations provide does not matter for PSLF purposes. "
Most hospitals are 501(c)(3).