TO PAY YOUR BILL: Conveniently pay online 24 hrs a day or call 202-299-1600 Monday-Friday. HAVE HEALTH QUESTIONS? GIVE OUR UNITY NURSES A CALL: As a patient of Unity Health Care, our on-call nurse can answer your medical questions and help you get the care you need by calling 202-469-4699. TO SHARE A COMPLIMENT OR COMPLAINT:.