This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (October 2013) (Learn how and when to remove this template message)
The International Classification of Health Interventions (ICHI) is a system of classifying procedure codes being developed by the World Health Organization (WHO). It is currently only available as a beta release for additional coding work, and not yet ready for operational application. The last published version is denoted as beta version 2018 The multiaxial classification system has now reached a phase that the testing period for use in healthcare area is approaching during 2018. Updates on development and status of the classification are listed on WHO home page.
The International Classification of Procedures in Medicine (ICPM) was a system of classifying procedure codes published by the World Health Organization from 1978, but never received the same international acceptance as ICD-9. Due to difficulties in the consultation processes, international development of the work effectively stopped in 1989. As a result, most nations developed their own standards for coding procedures and interventions incompatible to the ICPM approach. Germany's OPS-301 is based on the Dutch extension of ICPM; the ICPM-DE.
Since 2012, the WHO began developing a replacement for ICPM called the International Classification of Health Interventions (ICHI). For those countries who didn't go on to develop their own classification of interventions, the WHO have generated a short list of procedure codes based on ICD-10-AM as an interim measure.
ICHI is using letters to identify a procedure. For example, code EAA.AD.AA is for Biopsy of Pituitary gland.
Some procedural concepts that are present in SNOMED CT do not have a corresponding concept in ICHI (e.g., endoscopy).. SNOMED CT is using attributes that may link procedures to other related concepts. For example, SNOMED CT concept model for procedure allows linking substances to procedures using 'Direct Substance' attribute. The scope for the set of relationships in ICHI is smaller compared to SNOMED CT.
The alpha version of WHO's ICHI was largely derived from the Australian Classification of Health Interventions (ACHI), a portion of the Australian standard ICD-10-AM, which in turn was largely derived from ICD-10 and the United States extension ICD-9-CM. Currently (2014) the acceptance of the ICHI in the community of health care professionals might be better, but due to missing formal acceptance the spread of national variations beyond translation widely continues.
For accounting, the Australian health administration generated a code of Diagnosis-related groups which in effect again deviates from the WHO basis. The same phenomenon applies to DRG codes in Germany and other countries. Other codes generated by the UN accredited International Standards Organisation ISO defined a deviating scope. Cooperation of ISO and WHO is not detected.