Application service provider services featuring software for verification of insurance coverage, Medicare medical necessity, and payer authorization; application service provider services featuring software for electronic verification of payer eligibility, authorization and referrals via the Internet, delivery of real-time Medicare medical necessity compliance checking to verify outpatient procedures for physicians, clinics, hospital-based providers and personnel using Internet, secure VPN or intranet to perform outpatient validation and secure documentation necessary to assure a provider's ability to be paid; providing online non-downloadable software verification of insurance coverage, Medicare medical necessity, and payer authorization; providing online non-downloadable software for electronic verification of payer eligibility, authorization and referrals via the Internet, delivery of real-time Medicare medical necessity compliance checking to verify outpatient procedures for physicians, clinics, hospital-based providers and personnel using Internet, secure VPN or intranet to perform outpatient validation and secure documentation necessary to assure a provider's ability to be paid