Appendix K: External Code Sources

State codes, ZIP codes and other geographic associations

https://www.usps.com/

Provider names associated with National Provider Identifier (NPI) number

https://nppes.cms.hhs.gov/NPPES/

Healthcare provider taxonomy specialty codes

https://www.cms.gov/Medicare/Provider-Enrollment-and-Certification/MedicareProviderSupEnroll/Downloads/TaxonomyCrosswalk.pdf

Dental codes: http://www.ada.org/~/media/ADA/Member%20Center/FIles/topics_npi_taxonomy.ashx

Definitions of ICD-9 and ICD-10 diagnosis codes

http://www.cms.gov/Medicare/Coding/ICD9ProviderDiagnosticCodes/codes.html

Definitions of ICD-9 and ICD-10 Procedure codes

Definitions of HCPCS, CPTs and Modifier codes

Dental procedure and identifier codes

http://www.ada.org/

Standard professional billing elements

http://www.cms.gov/Regulations-and-Guidance/Guidance/Manuals/downloads/clm104c26.pdf

Claim adjustment reason codes

http://www.wpc-edi.com/reference/

ISO country codes

http://unstats.un.org/unsd/methods/m49/m49alpha.htm

Note:  This link is the no cost best resource for ISO 3 numeric country codes.

National Council for Prescription Drug Programs (NCPDP)

http://www.ncpdp.org

National Association of Boards of Pharmacy (NABP)

http://www.nabp.net

North American Industry Classification System

http://www.census.gov/eos/www/naics/

Standard Industrial Classification (SIC) System

https://www.osha.gov/pls/imis/sic_manual.html