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Wagner T, Lachance M, Gonsoulin M. The Researcher's Notebook: Procedure Codes in VHA: Use of Inpatient ICD Procedure vs Outpatient CPT Codes. 2018 Jun 5. Available from: http://vaww.virec.research.va.gov/Notebook/RNB/RNB11-CrowDS-VHA-Procedure-Codes-CY18.pdf.
This notebook describes the history of coding methods using CPT and ICD codes for outpatient and inpatient procedures CPT codes.