OU Physicians offers two ways to pay online: GuestPay (no login required) and OU Physician's Patient Portal (login required). GuestPay provides a convenient way for OU Physicians patients without a MyOUMedicine account to pay their bill online. NOTE: It may take up to 5 business days for your GuestPay payment to be reflected on your account.Forgot Your Username‧Ou Physicians‧Contact Us.