The Agency for Healthcare Research and Quality (AHRQ), with scientific guidance from C.J. Peek and other integrated care experts, released The Lexicon for Behavioral Health and Primary Care Integration: Concepts and Definitions Developed by Expert Consensus. This document established a shared language for describing the core functions and principles of integrated care.

Around the same time, the Center for Integrated Health Solutions—supported by SAMHSA and HRSA—published A Standard Framework for Levels of Integrated Healthcare. This framework gave depth and structure to commonly used terms like coordinated, co-located, and integrated care, offering clear definitions along with descriptions of scope and complexity.