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  2. National Provider Identifier - Wikipedia

    en.wikipedia.org/wiki/National_Provider_Identifier

    A National Provider Identifier (NPI) is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services (CMS). The NPI has replaced the Unique Physician Identification Number (UPIN) as the required identifier for Medicare services, and is used by other payers ...

  3. Area code 603 - Wikipedia

    en.wikipedia.org/wiki/Area_code_603

    In 2011, area code 603 was said to be nearing exhaustion and a second area code for New Hampshire was expected to be activated by 2013 as a statewide overlay plan. [1] As a result of changes in allocation policies and a reclamation of a large block of previously allocated telephone numbers, including number pooling , the exhaustion time frame ...

  4. Area codes 530 and 837 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_530_and_837

    This area code was therefore scheduled to transition to ten-digit dialing by October 24, 2021. [1] On June 8, 2023, the California Public Utilities Commission assigned area code 837 to overlay 530, effective January 31, 2025. [2] 837 will serve as California's 40th area code. As ten-digit dialing is already in effect, no permissive dialing ...

  5. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC). NPAs with 9 in the second position are reserved for future format expansion.

  6. Telephone numbering plan - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbering_plan

    When dialing a telephone number, the area code may have to be preceded by a trunk prefix or national access code for domestic calls, and for international calls by the international access code and country code. Area codes are often quoted by including the national access code. For example, a number in London may be listed as 020 7946 0321.

  7. Toll-free telephone numbers in the North American Numbering ...

    en.wikipedia.org/wiki/Toll-free_telephone...

    Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, or 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

  8. Area codes 716 and 624 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_716_and_624

    Area codes in New York state with the area codes 716 and 624 highlighted in red. Area codes 716 and 624 are telephone area codes in the North American Numbering Plan (NANP) for Buffalo, Niagara Falls, and four surrounding counties in western New York. 716 was one of the original North American area codes established in 1947, while 624 was assigned to the identical numbering plan area (NPA) in ...

  9. Area codes 813 and 656 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_813_and_656

    Area codes 813 and 656 are area codes in the North American Numbering Plan for the U.S. state of Florida in the city of Tampa, Florida, and its surrounding areas, such as Zephyrhills and Oldsmar. In 2022, due to exhaustion of central office prefixes, area code 656 was added to the service area forming an overlay complex .