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Class steward is Patient Care
The term "procedure" typically stands for surgical procedures. But the Procedure class covers all direct care activities, whether performed by physicians, nurses, physiotherapy providers, etc.
All procedures other than dermatological has an anatomic site of access or entry and an anatomic site which the procedure is targeted at and that is reached through the entry site. For example an arteria pulmonalis catheter targets a pulmonary artery but the access site is typically the vena carotis interna or the vena subclavia, at the neck or the fossa subclavia respectively.
The coding system is the same as for Service.body_site.