Illinois accounts for 275 behavioral health providers in the latest CMS NPI registry weekly update, representing 3% of the national weekly total. This modest share reflects the state's position as a mid-tier contributor to the national ABA and allied behavioral health workforce. One new provider registered this week, part of a larger trend: 155 providers have joined the registry year-to-date, signaling sustained demand for behavioral health services across the state.

The credential breakdown reveals a fragmented workforce. Core ABA practitioners—22 BCBAs and 45 RBTs—represent only about one-quarter of the active roster. Just one dual BCBA-RBT credential holder appears, suggesting limited vertical career progression within the traditional ABA pipeline. The remainder comprises allied professionals: 17 LCPCs, 14 LPCs, and 13 LCSWs dominate, indicating that Illinois's behavioral health ecosystem relies heavily on licensed mental health clinicians rather than board-certified behavior analysts. This credential distribution may signal either a shortage of ABA-trained supervisors or a broader shift toward integrated mental health models in the state.

The workforce skews female: 80% of providers identify as women, while 17% identify as men and 2% as nonbinary. 219 individuals populate the registry alongside 56 organizations, with Chicago, Naperville, and Springfield forming the geographic spine. The presence of 50 providers holding multiple taxonomy codes suggests some cross-disciplinary practice, though it does not clarify whether ABA and mental health services are truly integrated or merely co-located. Illinois's modest BCBA-to-RBT ratio and thin BCBA bench could constrain supervision capacity as demand for ABA services continues to rise.