Licensure follows the patient
The location that matters for telehealth is generally the patient’s, not yours. Sitting in one state and caring for a patient in Illinois generally means you need authority to practice in Illinois — via compact privilege or an Illinois license. See telehealth: patient in another state.
The law that governs this in Illinois
Caring for a patient located in Illinois is practice in Illinois, so it is Illinois’s own nurse practice act that defines what you may do and the Illinois Board of Nursing (IDFPR) that applies it. That act is 225 ILCS 65 (Nurse Practice Act).
There is no compact statute to cite for Illinois, which is the substantive point rather than a gap in our research: Illinois has not adopted the compact, so the practice act above is the whole of the law that applies to you here.
Compact status is not the only consideration
Even where a multistate license reaches Illinois, your employer and the Illinois Board of Nursing (IDFPR) may impose additional requirements, and some roles carry their own rules. Compact status answers one question — it is not a blanket authorization to practice remotely.
APRN telehealth is separate
The compact covers RN and LPN/LVN licenses only. If you work as an APRN, your advanced-practice authority is granted state by state and is not carried by a multistate RN license — a point that catches out a lot of remote NP roles.
Why compact privilege does not reach Illinois
Illinois has not adopted the compact. Either way the practical answer for caring for patients located in Illinois is the same today: a multistate license from another state does not authorize it, and you generally need an Illinois license from the Illinois Board of Nursing (IDFPR). Re-check before a start date rather than assuming — this is precisely the fact that changes.