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Table 2 Possible groupers for “Anesthesia for Caesarean section”

From: A numerical similarity approach for using retired Current Procedural Terminology (CPT) codes for electronic phenotyping in the Scalable Collaborative Infrastructure for a Learning Health System (SCILHS)

Groupers for Anesthesia for Cesarean section (850)
l a b Name
1 100 1999 Anesthesia
2 800 882 Anesthesia for procedures on the lower abdomen
3 840 851 Anesthesia for intraperitoneal procedures in lower abdomen including laparoscopy
  1. The third (most specific) is chosen by our method. l is hierarchical level, a is the smallest code in this category, and b is the largest code