Procedure codes are a sub-type of medical classification used to identify specific surgical, medical, or diagnostic interventions. The structure of the codes will depend on the classification; for example some use a numerical system, others alphanumeric.
Examples of procedure codes
- International Classification of Primary Care (ICPC-2), as well as procedure codes; ICPC-2 also contains diagnosis codes, reasons for encounter (RFE), and process of care.
- International Classification of Procedures in Medicine (ICPM) and International Classification of Health Interventions (ICHI)
- SNOMED CT
- Canadian Classification of Health Interventions (CCI) (used in Canada. Replaced CCP.) 
- Current Dental Terminology (CDT)
- Healthcare Common Procedure Coding System (including Current Procedural Terminology) (for outpatient use; used in United States)
- ICD-10 Procedure Coding System (ICD-10-PCS) (for inpatient use; used in United States)
- ICD-9-CM Volume 3 (subset of ICD-9-CM) (formerly used in United States prior to the introduction of the ICD-10-PCS)
- Nursing Interventions Classification (NIC) (used in United States) 
- Nursing Minimum Data Set (NMDS)
- Nursing Outcomes Classification (NOC)
- Classification des Actes Médicaux (CCAM) (used in France)
- Classificatie van verrichtingen (Dutch)
- Gebührenordnung für ärzte (GOÄ) (Germany)
- Nomenclature des prestations de santé de l'institut national d'assurance maladie invalidité (Belgium)
- OPCS-4 (used by the NHS in England)
- OPS-301 (adaptation of ICPM used in Germany)
- Read codes, used in United Kingdom General Practice
- TARMED (Switzerland)
- "WHO / International Classification of Health Interventions (ICHI)". World Health Organization. Retrieved 2011-06-14.
- "CCI to Replace ICD-9 in Canada"
- "Overview: Nursing Interventions Classification "
- ccam.sante.fr Archived October 16, 2005, at the Wayback Machine
- fhs.usyd.edu.au Archived June 20, 2005, at the Wayback Machine