5.1 Prescriber Authority, DEA Registration & Out-of-State Prescriptions
Key Takeaways
Oregon physician associates may prescribe Schedule II–V drugs under a collaboration agreement, and NPs and CNSs with Nursing Board authority prescribe Schedule II–V drugs independently.
The Oregon ND formulary excludes general anesthetics, injectable ketamine, most barbiturates, most systemic oncology drugs and abortifacient mifepristone/misoprostol. Stimulants are not excluded.
Under ORS 689.525, an out-of-state prescription is filled only if authentic and based on a valid patient–practitioner relationship, and generic substitution requires authorization on the prescription.
A DEA number check-digit test adds digits 1, 3 and 5, then adds twice the sum of digits 2, 4 and 6; the last digit of the total must match digit 7.
DEA's fourth temporary telemedicine extension allows controlled substance prescribing without a prior in-person visit through December 31, 2026.
Why this matters
Before checking whether a prescription is complete, a pharmacist must confirm that the prescriber is authorized to prescribe that drug for that patient. Area 2.1 tests the "scope of authority ... and valid registration of practitioners who are authorized to prescribe, dispense, or administer drugs." In Oregon a valid order needs three things: a state license whose scope covers the drug and condition, a DEA registration for any controlled substance, and a legitimate practitioner–patient relationship.
Oregon prescribers at a glance
| Prescriber | Oregon licensing law | Prescribing scope a pharmacist must check |
|---|---|---|
| Physician (MD/DO) | Oregon Medical Board; ORS 677 | Full scope, including Schedules II–V with DEA registration |
| Physician associate (PA) | Oregon Medical Board; ORS 677.510–.511 | May prescribe, including Schedules II–V. Must have a collaboration agreement signed by a physician, podiatric physician or employer; with fewer than 2,000 post-graduate hours, the agreement includes a collaboration-hours plan. Oregon renamed physician assistants "physician associates" in 2024 |
| Nurse practitioner (NP) and clinical nurse specialist (CNS) | Oregon State Board of Nursing; ORS 678.390 | Independent prescriptive authority, including Schedules II–V, when granted by the Nursing Board. No physician supervision is required |
| Certified registered nurse anesthetist (CRNA) | Oregon State Board of Nursing; ORS 678.282 | Only with Nursing Board authorization (including Schedules II–V), and only for a patient for whom the CRNA has established a record |
| Dentist | Oregon Board of Dentistry; ORS 679 | Dental scope only |
| Podiatric physician | Oregon Medical Board; ORS 677.805–.840 | Foot and ankle scope |
| Optometrist | Oregon Board of Optometry; ORS 683 | Optometric purpose only. A controlled substance prescribed without a legitimate optometric purpose is a disciplinary ground |
| Naturopathic physician (ND) | Oregon Board of Naturopathic Medicine; ORS 685 | Only drugs on the naturopathic formulary set by the Council on Naturopathic Physicians Formulary (ORS 685.145) and adopted by rule |
| Veterinarian | ORS 686 | Animals only. The prescription names the animal, the owner and the species |
| Pharmacist | ORS 689.645, .689, .696, .698, .704 | Only by formulary, statewide protocol, CDTM or a specific statute (Chapter 6) |
Naturopathic physicians: a frequent trap
Oregon NDs prescribe from a formulary based on the American Hospital Formulary Service (AHFS) pharmacologic-therapeutic classification (OAR 850-060-0226). The formulary has specific exclusions (OAR 850-060-0223):
- General anesthetics and injectable ketamine.
- Barbiturates, except phenobarbital, butalbital and primidone.
- Systemic oncology agents, except a short list of oral and topical agents such as methotrexate, tamoxifen, anastrozole and letrozole.
- Mifepristone and misoprostol used as an abortifacient.
- Anything not in the AHFS classification or approved by the Board.
Controlled substances are not excluded as a class. An Oregon ND with a DEA registration may prescribe a scheduled drug in an included class, such as a Schedule II stimulant for ADHD. ORS 689.635 lets a pharmacist dispense an ND formulary prescription and says that doing so is not evidence of negligence if done within reasonable and prudent practice.
DEA registration and the "valid registration" check
Federal law (21 CFR 1306.03) allows only an individual practitioner who is authorized by the state and registered with DEA (or exempt, like certain federal or institutional practitioners) to issue a controlled substance prescription. On a controlled substance prescription, the pharmacist should confirm:
- A DEA number in the expected format: two letters and seven digits. The first letter shows the registrant type (for example A, B, F or G for practitioners, M for mid-level practitioners). The second letter is usually the first letter of the prescriber's last name.
- The check digit. Add the 1st, 3rd and 5th digits. Add the 2nd, 4th and 6th digits and double that sum. Add the two results; the last digit of the total must equal the 7th digit.
- That the prescribed schedule is within both the DEA registration and the state authority. A DEA registration never expands a state scope of practice.
Out-of-state prescribers (ORS 689.525)
An Oregon pharmacist may fill a prescription from a practitioner licensed in another U.S. state or territory only after deciding, in professional judgment, that it was issued under a valid patient–practitioner relationship and that it is authentic. If the prescriber is unknown to the pharmacist, the pharmacist must obtain proof of validity to a reasonable certainty.
Important
ORS 689.525(3) provides that the generic substitution authority of ORS 689.515 does not apply to an out-of-state prescription unless the prescription authorizes it. This is an Oregon-specific rule that is easy to miss.
Telemedicine and controlled substances
The federal Ryan Haight Online Pharmacy Consumer Protection Act generally requires at least one in-person medical evaluation before a controlled substance is prescribed by means of the internet. A practice-of-telemedicine exception applies. DEA and HHS have repeatedly extended COVID-era telemedicine flexibilities. The fourth temporary extension runs through December 31, 2026. Until then, DEA-registered practitioners may prescribe Schedule II–V drugs after an audio-video telemedicine encounter without a prior in-person visit, and may prescribe Schedule III–V opioid use disorder medications after an audio-only encounter. Pharmacists still exercise corresponding responsibility, covered in section 5.5. An order based only on an online questionnaire, with no real clinical evaluation, does not establish a legitimate practitioner–patient relationship.
Exam scenario
An Oregon pharmacy receives three prescriptions:
- Methylphenidate from an Oregon ND who holds a DEA registration. Methylphenidate is in an included AHFS class and is not on the ND exclusion list, so the pharmacist processes it after the usual controlled substance checks.
- Lisinopril from a dentist for a patient's hypertension. This is outside dental scope, so the pharmacist contacts the dentist and declines to fill it as written.
- Atorvastatin written by brand name by a California physician, with no substitution instruction. ORS 689.525(3) bars generic substitution unless authorized, so the pharmacist dispenses the brand or obtains the prescriber's authorization to substitute.
An Oregon naturopathic physician with a valid DEA registration prescribes mixed amphetamine salts for an adult with ADHD. How should the pharmacist evaluate prescriber authority?
Refuse, because Oregon NDs may not prescribe any Schedule II drug
Accept only if a supervising physician co-signs
Dispense a 72-hour supply and refer the patient to a physician
Treat it as within scope if it is on the ND formulary; Oregon's ND exclusions cover items such as injectable ketamine and most barbiturates, not stimulants
A patient presents a prescription from a Washington physician for brand-name Synthroid, with no instruction about substitution. Under ORS 689.525, what may the Oregon pharmacist do?
Dispense the brand, or obtain the prescriber's authorization before substituting a generic, after confirming the prescription is authentic and based on a valid relationship
Substitute any AB-rated levothyroxine automatically under ORS 689.515
Refuse, because Oregon pharmacies may not fill out-of-state prescriptions
Dispense only a 30-day supply until an Oregon prescriber rewrites it
A prescription lists DEA number BJ6125341 for Dr. Jones. Using the standard check-digit test, what is the result?
Invalid, because the second letter must be the prescriber's first initial
Valid, because 6+2+3 = 11 and 2×(1+5+4) = 20, totaling 31, whose last digit matches the final digit 1
Invalid, because mid-level practitioners must use the letter A
Valid only if the prescription is for Schedule V
Sections you finish are checked off in the contents.