OPS (in earlier versions: OPS-301), the Operationen- und Prozedurenschlüssel (Operation and Procedure Classification System) is the German modification of the International Classification of Procedures in Medicine (ICPM). For German hospitals it is currently the official coding system for medical procedures. Apart from its use for clinical controlling and performance statistics it is and basis for inpatient claims processing within the German Diagnosis-related Groups (G-DRG) system. Yearly OPS releases are produced by DIMDI (Deutsches Institut für Medizinische Dokumentation und Information). Besides OPS, G-DRG also requires disease codes based on ICD-10-GM is (the German Modification of the current WHO standard).


Basis for OPS was the Dutch ICPM-DE, from which the procedure classification OPS-301 according to §301 SGB V was created. Version 1.0 was published in October 1994 and became effective in January 1, 1995. Originally a subset of ICPM, OPS-301 has been expanded by a significant number of national codes since version 2.0 (effective in 2001). The OPS classification gained an enormous importance with the introduction of the G-DRG flat rate system in 2004.

In 2005, the suffix "-301" was omitted, because the application of OPS was no longer limited to the cases regulated by §301 SGB V, being extended to outpatient procedures in hospitals (§115b SGB V) and outpatient care by private physicians (§295 SGB V).

Properties and metrics of OPS 2008


  • 6 chapters, not consecutively numbered
  • 65 section headings (e.g., 5-29 to 5-31: Operations on pharynx, larynx and trachea)
  • 230 three-digit classes (e.g. 5-31: Other operations on larynx and operations on trachea)
  • 1400 four-digit classes(e.g., 5-314: Excision, resection and destruction (of diseased tissue) of the trachea
  • 7800 five-digit classes (e.g. 5-314.1: resection
  • About 18 700 additional six-digit classes (e.g. 5-314.11: With end-to-end anastomosis)
  • Notation: first three characters numeric, fourth character alphanumeric , fifth and sixth character alphanumeric (with letters for residual classes: "x" : any other procedure, "y": unspecified)
  • Classification criteria, first of all topographical (not by clinical specialty)
  • Not all digits in the four-digit classification are used (for assuring comparability with the original ICPM)
  • More than one code required in case of changes of the surgical site or intra-operative complications
  • Inclusion and exclusion rules, further information at the highest possible level in the hierarchy
  • Mono-hierarchical classification with respect to the physiology

Diagnostic procedures




Non-surgical therapeutic measures

Additional measures

  • 9: Additional measures
    • 9-20...9-20: and nursing care of patients
    • 9-26...9-28: birth Accompanying measures and treatment for infertility
    • 9-31...9-32: Phoniatrics and pedaudiological therapy
    • 9-40...9-41: psychosocial, psychological, neuropsychological and psychotherapeutic treatment
    • 9-50...9-50: Preventive measures
    • 9-60...9-64: treatment of mental and psychosomatic disorders and behavioral disorders in adults
    • 9-65...9-69: treatment of mental and psychosomatic disorders and behavioral disorders in children and adolescents
    • 9-98...9-99: Other complementary measures and information

See also

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