PMHNP Practice Authority in Washington: Independence, Physician Agreements and Schedule II

AANP's May 2026 map puts Washington in its full practice tier.

The label is AANP's advocacy classification; the legal facts behind it have two halves.

Prescribing is gated, but by the nursing board, not a physician: RCW 18.79.050's second sentence authorizes prescribing of legend drugs and Schedule V, and Schedules II through IV, upon approval by the board — and neither that section nor the activities list in RCW 18.79.250 names a physician collaboration, delegation or supervision requirement anywhere.

The board-defined scope is the other recurring condition, and the rules carrying it (WAC 246-840) were not read for this page.

For a PMHNP weighing a job offer, the structure is: licence, board approval to prescribe, board-defined scope — no medical board, no agreement, no physician signature in the chain.

The gate the sections set is approval, not time.

RCW 18.79.050 conditions prescribing on approval by the board, but neither it nor RCW 18.79.250 conditions any activity on hours practised or years elapsed — no transition-to-practice period stands between licensure, that approval and full practice.

A new graduate and a clinician relocating to Washington stand before the same statutory text, and the sections read record no supervised-years interval standing between licensure, the board approval and practice at full scope.

The caveat matters: the research read only the RCW, and the board's administrative rules in WAC 246-840 were not read, so the approval process itself and any rule-level conditions cannot be described from these sources — confirm licence and prescribing requirements with the board.

The two sections read contain no collaborative or supervisory agreement: no physician signature, no APRN-per-physician ratio, no meeting frequency, no chart-review requirement, and nothing filed with a medical board.

The statute frames the licence affirmatively — the RCW 18.79.250 activities attach to the licence, excepted only by RCW 18.79.260 and 18.79.270, which were not among the sections read; prescribing carries its separate board-approval condition (RCW 18.79.050), but no clause in RCW 18.79.050 or RCW 18.79.250 names a physician.

Because the board's rules were not read either, treat this as an absence in the RCW rather than a verified statewide picture, and confirm current practice rules with the board.

RCW 18.79.050 conditions prescribing on approval by the board; on that approval, RCW 18.79.250(2) authorizes the ARNP to prescribe legend drugs and Schedule V controlled substances, and Schedules II through IV, within the scope of practice defined by the board.

The cross-referenced construction clause RCW 18.79.240(1)(s) says the chapter is not to be construed as prohibiting ARNPs from ordering or prescribing Schedules II–IV if and to the extent their scope of practice permits.

Clause (r) is also a non-prohibition, not a restriction: it keeps the chapter from barring board-approved CRNAs without prescriptive authority prior to July 1, 2026 from selecting, ordering, or administering Schedules II–IV, only within its anesthesia-specific conditions; a psychiatric NP's prescribing runs through (s).

No statutory day-supply cap, setting restriction or physician sign-off attaches to Schedule II, so an approved outpatient Washington PMHNP can prescribe Schedule II ADHD stimulants within the board-defined scope; Schedule I stays off-limits under 18.79.240(1)(p).

The scope rules (WAC 246-840) were not read — confirm with the board.

A separate state controlled-substance registration was not located in the sources read.

The statute's recurring conditions are the board's approval for prescribing and the scope defined by rule by the board (RCW 18.79.050); what that rule-based scope contains in detail was not read (WAC 246-840).

RCW 18.79.250's activity list runs from specialized and advanced levels of nursing (1) through prescribing (2, exercised on the board approval RCW 18.79.050 requires) to the titles the licensee may hold out under: advanced registered nurse practitioner, certified nurse practitioner, certified nurse midwife, certified registered nurse anesthetist, or certified clinical nurse specialist (4).

Federally, a PMHNP registers with the DEA as a mid-level practitioner (21 CFR 1300.01) — a registration that covers only what Washington allows — and the DEA/HHS telemedicine flexibilities, extended through December 31, 2026 (90 FR 61301), remove the federal in-person evaluation requirement without lifting any Washington limit.

Washington has not enacted the APRN Compact.

The compact takes effect only once seven states enact it, and as of September 2026 five had (Delaware, North Dakota, South Dakota, Utah and Wyoming), so no APRN holds a multistate APRN licence today.

The Nurse Licensure Compact is an RN compact and gives no nurse practitioner authority in another state.

To practice as a PMHNP in Washington you need the Washington licence from the Board of Nursing.

The legislature's RCW display carries both versions of the key sections: advanced registered nurse practitioner (ARNP) effective until June 30, 2027, and advanced practice registered nurse (APRN) in the versions effective June 30, 2027.

The act history differs by section: 18.79.050's 2027 version was amended by 2024 c 239 § 3 (its until-2027 version by 2025 c 58 § 5005); 18.79.250's 2027 version by 2024 c 239 § 13 and 2026 c 139 § 12 (until-2027: 2025 c 58 § 5018 and 2026 c 139 § 11); 18.79.240 similarly carries 2026 c 139 §§ 9–10 alongside 2024 c 239 § 12 / 2025 c 58 § 5017.

The content of these acts beyond the rename was not read.

Practically: job postings, applications and the board's forms may use either title across the switch — the underlying licence and its prescribing authority are the same chapter 18.79 RCW.