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. 2022 May 23;10:20503121221099021. doi: 10.1177/20503121221099021

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© The Author(s) 2022

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — PRISMA flowchart showing the step-by-step process of selection including inclusion and exclusion criteria to generate the final number of studies for analysis in this systematic review of coding and billing in the outpatient setting.