AHRQ maintains some concepts in what may be considered AHRQ vocabulary.
e.g. AHRQ Utilization flag
CCS-Services and Procedures provides a method for classifying Current Procedural Terminology (CPT®) codes and Healthcare Common Procedure Coding System (HCPCS) codes into clinically meaningful procedure categories.
More than 9,000 CPT/HCPCS codes and 6,000 HCPCS codes are collapsed into 244 clinically meaningful categories that may be more useful for presenting descriptive statistics than are individual CPT or HCPCS codes. For example, CCS-Services and Procedures can be used to identify populations for procedure-specific studies or to develop statistical reports providing information (such as charges and length of stay) about relatively specific procedures.
They may be considered concept-ancestors of CPT4 and HCPCS, that currently have no meaningful hierarchy in OMOP Vocabulary. I am not sure if these AHRQ vocabulary should be 'standard concepts' or 'classification concepts' in OMOP vocabulary.
Thoughts on including this?