Asia-Pacific Economic Cooperation, or APEC, is the premier forum for facilitating economic growth, cooperation, trade and investment in the Asia-Pacific region.
Provider Transaction Access Number (PTAN) A PTAN is a Medicare-only number issued to providers by MACs upon enrollment to Medicare. When a MAC approves enrollment and issues an approval letter, the letter will contain the PTAN assigned to the provider.
An ABN is a Medicare waiver of liability that providers are required to give a Medicare patient for services provided that may not be covered or considered. medically necessary. 1  An ABN is used when service(s) provided may not be reimbursed by Medicare.n ABN is a Medicare waiver of liability that providers are required to give a Medicare patient for services provided that may not be covered or considered. medically necessary. 1  An ABN is used when service(s) provided may not be reimbursed by Medicare.