The exchange qualifier is used to describe the exchange identifier. For example, if we have qualifier 12, he says that the exchange identifier is a phone number. Here is a list of all valid identifiers in EDI (X12 - V004010)
01 - Duns (Dun and Bradstreet)
02 - SCAC (standard alpha carrier code)
03 - FMC (Federal Maritime Commission)
04 - IATA (International Air Transport Association)
08 - UCC EDI Communication Comm Identifier (Comm ID)
09 - X.121 (CCITT)
10 - Ministry of Defense (DoD) activity address code
11 - DEA (Drug Enforcement Administration)
12 - Telephone (Telephone Companies)
13 - UCS code (UCS code is a code used for UCS transmissions, it includes the Code area and modem phone number; it does not include punctuation marks, spaces or an access code)
14 - Duns Plus Suffix
15 - Society of Petroleum Accountants of Canada Company Code
16 - Duns Number with 4 Character Suffix
17 - American Bankers Transit Routing Number (ABA) (including check digit, 9 digits)
18 - American Railroad Association (AAR) Standard Distribution Code
19 - EDI Council of Australia (EDICA) Communication Identification Number (COMM ID)
20 - Health Industry Number (HIN)
21 - Integrated Honorary Education Education Data System or (IPEDS)
22 - Federal Interdepartmental Commission for Education, or FICE
23 - National Center for Education Statistics General data core 12-digit number for pre-K-Grade 12 Institutes or NCES
24 - College Entrance Test Test Program 4-digit Honorary Institution Code or ATP
25 - American College Testing Program 4-digit code of honor or ACT
26 - Statistics Canada List of Information Security Agencies
27 - Carrier Identification Number assigned by the Health Financing Authority (HCFA)
28 - Reseller Tax Identification Number assigned by the Health Financing Authority (HCFA)
29 - Medicare provider and provider identification number assigned by the Health Financing Administration (HCFA)
30 - US Federal Tax Identification Number
31 Category identification number plus 4 assigned by the International Association of Industrial Accidents and Commissions Commissions (IAIABC)
32 - US Federal Employer Identification Number (FEIN) 33 National Insurance Commissioner Association Company Code (NAIC)
34 - Medicaid provider and provider identification number assigned by selected Medicaid government agencies in conjunction with the Health Financing Administration (HCFA)
35 - Statistics Canada Canada College Student Information System Institutional Codes
36 - Codes of the institutional information systems of the University of Canada of Canada
37 - Society of Information Compilers and Information Analysts
AM - Mexicana del Codigo de Producto Association Communication Identifier (AMECOP)
NR - National Retailers Association (NRMA) - Designated
SN - Standard Address Number
ZZ - Mutual Definition