Delegation is the legal mechanism that makes most of the medspa industry possible. Without it, every injection would require a prescriber to hold the syringe. Understanding its boundaries is what separates practices that scale safely from practices that scale until someone looks closely.
The statutory basis
Arizona's Nurse Practice Act at A.R.S. § 32-1633 permits a registered nurse to perform delegated medical acts under the order of a licensed prescriber. Injecting a neuromodulator or a dermal filler is the practice of medicine; the order is what makes it lawful for the nurse to do it.
Two features of the Arizona framework matter in practice. First, the prescriber issuing the order may be a physician, an NP, or a PA — it does not have to be a physician, which is why NP-directed practices are viable here. Second, the statute does not impose a general requirement that the prescriber be physically present while the delegated act is performed.
What delegation requires
- A licensed prescriber issuing the order. Physician, NP, or PA.
- A written order — a standing order or a patient-specific order — covering the actual procedures and zones being performed.
- A good-faith exam preceding treatment, performed by a prescriber.
- A nurse competent to perform the act, with training and demonstrated competency documented.
- An escalation path the nurse can actually use when a situation exceeds the order.
The limit that surprises people: supervision does not expand a license
This is the single most misunderstood point in the entire delegation framework, and it has ended careers.
A prescriber may delegate a medical act only to someone whose own license already permits them to perform it. Delegation distributes authority within a scope; it does not create scope that the licensee never had. An esthetician working under a physician's supervision still cannot inject, because injection is not within esthetician licensure at all. No agreement, no training certificate, and no supervising physician changes that.
Professional liability coverage generally follows lawful practice. If a treatment was performed by someone whose license did not permit it, carriers frequently take the position that the act falls outside the policy. So the exposure is not only a board complaint — it is a board complaint you may be defending without coverage.
The delegation matrix
The practical artifact that proves you have thought this through is a delegation matrix: a table listing every service on your menu against every credential in your practice, marking which combinations are permitted and under what conditions.
| Service | MD/DO | NP | PA | RN | MA | Esthetician |
|---|---|---|---|---|---|---|
| Good-faith exam | Yes | Yes | Yes | No | No | No |
| Neuromodulator injection | Yes | Yes | Yes | Delegated | No | No |
| Dermal filler injection | Yes | Yes | Yes | Delegated · Level III | No | No |
| IV infusion | Yes | Yes | Yes | Delegated | Limited | No |
| Chemical peel (superficial) | Yes | Yes | Yes | Yes | Varies | Within scope |
This is illustrative rather than a substitute for one built around your actual menu, staffing, and counsel's review. But it shows the shape: every row forces an explicit decision, and the blank cells are where practices get into trouble by improvising.
The risk tier of each delegated procedure is set by Arizona's Level II and Level III framework, which determines how much your order and your emergency preparation have to cover.
Frequently asked
Does the prescriber have to be physically present?
For Level II procedures such as neuromodulator injection, Arizona imposes no blanket physical-presence requirement. What is required is that the delegation be documented, that the order cover the specific procedures and zones performed, and that a good-faith exam by a prescriber precede treatment. Proximity is not the control; documentation and preparedness are.
Can any medical act be delegated?
No. Delegation has limits, and the clearest one is that a prescriber cannot delegate to someone whose own license does not permit the act. Supervision does not expand a license. An esthetician cannot be delegated injection because injection is outside esthetician scope entirely, no matter who is supervising.
Can a medical assistant receive delegated injections?
Arizona permits MAs to administer certain injections under direct supervision, but aesthetic injectables sit awkwardly in that model. The delegated-task framework assumes a defined task executed under supervision, while aesthetic injection requires continuous clinical judgment about depth, product, dosing, and vascular anatomy. That mismatch is why it generally falls outside what can be appropriately delegated to an MA.
Who is responsible when something goes wrong?
Both parties, in different ways. The nurse remains accountable for their own practice and for recognizing when a situation exceeds their competence. The delegating prescriber is accountable for the appropriateness of the delegation, the adequacy of the order, and the supervision structure. Neither can point at the other as a complete defense.
Does an NP need delegation to inject?
No. Arizona is a full practice authority state under A.R.S. 32-1601, so a board-certified NP evaluates, prescribes, and treats independently. Delegation is the mechanism that lets a registered nurse perform acts that would otherwise require prescriptive authority — it is not something an NP needs for their own practice.