There is evidence to support the effectiveness of community health workers (CHWs), as they practice in a wide range of health care settings; yet, the perceived value of CHWs suffers from a lack of uniform credentialing and from a dearth of billing and payment structures to recognize their individual work. In turn, credentialing and billing for the work of CHWs is hampered by widely variable regulation, conflicting job titles and position descriptions, and general confusion about CHW identity, sometimes complicated by service boundaries that overlap with those of other health care and social service occupations. This article presents evidence from a rapid review of the CHW literature from 2003 to 2018. It includes clinical trials, meta-analyses, and policy reports summarizing more than 200 CHW interventions intended to improve patient health status or care delivery. The evidence is used to identify CHW roles, responsibilities, behaviors, and competencies. Four categories of CHW practice are developed from the evidence: peer CHW, general CHW, clinical CHW, and health navigator. A framework is proposed to recognize unique CHW roles, promote and further integrate varied levels of CHW function into health care-related organizations, and to inform decisions regarding certification, education, and payment for CHW services in the United States.