Missouri Nurse Practitioner Scope of Practice Requirements

In Missouri, the scope of practice for a nurse practitioner is defined by a written collaborative practice agreement with a physician. Within that agreement, an NP can examine patients, order and interpret diagnostic tests, diagnose, build and manage treatment plans, and prescribe medications, including certain controlled substances. Outside the agreement, an NP has no legal authority to provide the service. The framework comes from Chapter 335 of the Revised Statutes of Missouri (the Nurse Practice Act) and Section 334.104, and it is enforced by the Missouri State Board of Nursing.¹²

Who Qualifies as an NP in Missouri

Missouri recognizes nurse practitioners as advanced practice registered nurses. To qualify, you need a current, unencumbered Missouri RN license and national certification in your role and population focus from a board-approved certifying body.³ The Missouri State Board of Nursing (MSBN) reviews applications, issues APRN recognition, and investigates violations.

Meeting those baseline requirements gets you recognized as an APRN. It does not, on its own, let you practice. Practice begins only once a valid collaborative practice agreement is signed.

What the Collaborative Practice Agreement Controls

The collaborative practice agreement (CPA) is the legal spine of NP work in Missouri. Section 334.104 requires the arrangement to be in writing, whether structured as a written agreement, jointly agreed-upon protocols, or standing orders. Both the collaborating physician and the APRN must sign and date it before it takes effect.⁴

The CPA spells out which clinical services the NP is authorized to perform. The collaborating physician has to ensure those delegated responsibilities match the NP’s education, training, and competence. If a service is not written into the CPA, it is not within the NP’s scope, no matter how routine that service might be in another state or another practice.

Physician Availability and File Review

The collaborating physician, or a designated alternate named in the CPA, must be immediately available for consultation at all times. Availability can be in person or through real-time telecommunications. Immediate availability does not require the physician to be physically present, but it does require the physician to be reachable when the NP needs clinical guidance.⁴

Missouri also requires ongoing chart review. The collaborating physician must review at least 10% of all healthcare services the APRN delivers. When the NP prescribes controlled substances, the physician must review at least 20% of those cases. The CPA itself must be reviewed at least once a year and revised as needed to reflect any change in practice scope or responsibilities.⁴

The One-Month On-Site Rule for New APRNs

Before an APRN can practice in a setting where the collaborating physician is not physically present, the NP must first complete at least one month of practice with the physician continuously on-site. The collaborating physician is responsible for determining and documenting when this requirement has been satisfied.²

An exception applies for APRNs working in population-based public health services, and for primary care or behavioral health APRNs where the physician is new to a patient population the NP already knows well.

The Six-FTE Cap

A single collaborating physician cannot enter into collaborative practice arrangements with more than six full-time equivalent APRNs, physician assistants, or assistant physicians, in any combination.² The cap has practical consequences. Finding a collaborating physician can be difficult, especially in rural areas. An NP who loses a collaborating physician effectively cannot practice until a new CPA is signed.

Prescriptive Authority

NPs in Missouri can prescribe medications, including some controlled substances, but only when the CPA specifically delegates that authority. The CPA must identify which drug classes the NP is authorized to prescribe, and both the physician and the APRN must sign the arrangement.⁴

Which Controlled Substances

APRNs with controlled substance authority can prescribe drugs in Schedules III, IV, and V. Schedule II authority is limited to hydrocodone products. Schedule III narcotic controlled substances and Schedule II hydrocodone prescriptions are further capped at a 120-hour supply with no refills.⁵ No APRN may prescribe controlled substances for themselves or for family members.

How to Obtain Controlled Substance Authority

Missouri requires a specific sequence. First, obtain APRN licensure from the MSBN. Second, receive controlled substance certification from the MSBN. Third, register with the Missouri Bureau of Narcotics and Dangerous Drugs (BNDD). Fourth, obtain a federal DEA registration number.⁶

The BNDD application must include a copy of the CPA and identify a collaborating physician who holds current Missouri controlled substance registration. If the collaborating physician loses controlled substance authority for any reason, the NP’s authority terminates immediately. The DEA classifies nurse practitioners as mid-level practitioners authorized to dispense controlled substances within their state’s scope of practice.⁷

Telehealth Prescribing

Missouri law prohibits prescribing any drug or controlled substance based solely on a telephone evaluation. APRNs may prescribe through telemedicine when a valid patient relationship has been established, which includes obtaining a reliable medical history, performing an adequate examination, discussing treatment options, and maintaining a medical record.⁸

At the federal level, COVID-era telehealth flexibilities for controlled substances have been extended through December 31, 2026. During this window, DEA-registered practitioners can prescribe Schedule II through V controlled substances by real-time audio and video telehealth without a prior in-person evaluation, provided the prescription serves a legitimate medical purpose and is within the practitioner’s usual professional practice.⁹ If these flexibilities expire, the default rule under the Ryan Haight Act requires an in-person visit before any controlled substance can be prescribed via telehealth.

Independent Practice Is Not Yet Authorized

Missouri does not currently permit full practice authority for nurse practitioners. Missouri HB 1635 proposed allowing APRNs with at least 2,000 documented practice hours to practice without a collaborative practice agreement, expanding prescriptive authority for independent APRNs, and permitting buprenorphine prescribing for substance use disorder treatment. The bill also included a provision that collaborating physicians could not be compelled to enter into a CPA against their will.

As of 2026, movement toward independent practice remains incremental. Until a change is enacted and takes effect, every Missouri NP should operate on the assumption that a valid CPA is required. Practicing outside a CPA, or providing services the CPA does not authorize, exposes the NP to disciplinary action by the Missouri State Board of Nursing.

1
Justia. Missouri Revised Statutes Chapter 335 – Nurses
2
Missouri Revisor of Statutes. Missouri Revised Statutes Section 334.104 – Collaborative Practice Arrangements
3
Cornell Law School. Missouri Code 20 CSR 2200-4.100 – Advanced Practice Registered Nurse
4
Legal Information Institute. Missouri Code of State Regulations 20 CSR 2200-4.200 – Collaborative Practice
5
Missouri Revisor of Statutes. Missouri Revised Statutes Section 195.070 – Controlled Substance Prescribing
6
Missouri Department of Health and Senior Services. BNDD Process for Advanced Practitioners
7
Drug Enforcement Administration. Mid-Level Practitioners Authorization by State – DEA Diversion
8
Missouri Revisor of Statutes. Missouri Revised Statutes Section 334.108 – Telehealth Prescribing
9
Federal Register. Fourth Temporary Extension of COVID-19 Telemedicine Flexibilities for Prescription of Controlled Medications