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.
The PTAN is USUALLY the license number for chiropractors. In California (for example) it's DC1234567. On the phone you have to enter the letters as a * plus the 2 digits that represent the letter. They have an explanation on the CMS site.