Psychiatric services in an IOP or PHP: staffing models, workflow and billing

The short answer

An IOP or PHP provides psychiatric services in one of four ways: a psychiatrist on staff or under contract; a psychiatric nurse practitioner working under a Texas prescriptive authority agreement with a physician (often the medical director); telepsychiatry from a licensed Texas prescriber; or referral to an outside prescriber with coordinated care. A setup that fits many outpatient programs is an NP for evaluations and medication management, working with a physician medical director. Whatever the model, write a referral trigger (who gets a psychiatric evaluation and how fast), reconcile medications at admission, level changes and discharge, and confirm with each payer whether prescriber visits are billed separately from the program's daily rate.

What psychiatric services cover in a program

In the program description we write for clients, psychiatric services are "evaluation and medication management by a prescriber on staff or under contract." In practice that means:

• Psychiatric evaluation when indicated, within a set number of days of admission that your policy names (our intake table leaves the number for the program to set, checked against any payer or accreditor timeline).
• Medication management for co-occurring depression, anxiety, bipolar disorder, PTSD and other conditions.
• Medication for addiction treatment: buprenorphine and naltrexone for opioid use disorder; naltrexone, acamprosate or disulfiram for alcohol use disorder. Covered in our guide to adding MAT to an IOP.
• Medical stability questions at admission: whether a client needs withdrawal management or a hospital first.
• Risk: reviewing clients who screen positive for suicide risk, and backing the clinical team on safety plans.
• Utilization review support: the physician side of peer-to-peer calls with payer reviewers.

The 4th edition of The ASAM Criteria added Level 2.7, medically managed intensive outpatient, above IOP (2.1) and high-intensity outpatient (2.5, the old PHP). If you plan to offer a medically managed level, read its staffing expectations before you choose a model; see IOP vs PHP vs OP for the level names.

Four staffing models

Model	Fits	Strengths	Watch for
1. Psychiatrist on staff or under contract	Larger programs, PHP, complex co-occurring caseloads	Full scope, including Schedule II medications; can also be the medical director	Cost and availability; Texas corporate practice of medicine rules on employing physicians (ask your attorney)
2. Psychiatric NP with a physician	Most IOPs and small PHPs	More clinic hours for the money; the physician reviews charts and handles what the NP can't	The prescriptive authority agreement, Schedule II limits for APRNs, and backup when the NP is out
3. Telepsychiatry	Rural programs, evening tracks, hard-to-hire markets	Access to prescribers who aren't local; client can be seen at the program	Texas license required; DEA telemedicine rules for controlled substances; a room and staff for the client's side of the visit
4. Referral and coordination	New programs before a prescriber is hired; clients with an established psychiatrist	No prescriber payroll	Wait times for outside appointments; you still need consent, communication and a physician for medical questions

A practical mix is models 2 and 4: an in-house NP for new clients, and coordination with the psychiatrists clients already see. Hiring a prescriber to run their own practice alongside yours? See starting a psychiatric NP practice in Texas.

Texas rules for prescribers

• Licenses: physicians through the Texas Medical Board; APRNs through the Texas Board of Nursing. A prescriber treating clients located in Texas, including by video, needs a Texas license.
• Prescriptive authority agreements: a Texas APRN prescribes under a written agreement with a delegating physician (Occupations Code chapter 157). Schedules III to V can be delegated; Schedule II only in limited settings such as hospital facility-based practice and hospice. In an outpatient program that matters for ADHD stimulants, which are mostly Schedule II: decide who manages them (the psychiatrist, or the client's outside prescriber) before you open.
• DEA registration covering the schedules the prescriber will use, through DEA Diversion Control. Texas has no separate state controlled-substance registration.
• The prescription monitoring program: Texas prescribers must check the PMP before prescribing opioids, benzodiazepines, barbiturates or carisoprodol (Health and Safety Code 481.0764). In a psychiatric clinic that's every benzodiazepine prescription.
• Telemedicine prescribing of controlled substances: DEA and HHS extended the telemedicine flexibilities through December 31, 2026 (Federal Register), and a separate rule allows buprenorphine for opioid use disorder by telemedicine for up to six months before an in-person visit. Plan for the rule that replaces the extension in 2027.
• Medications on site: if any medication is stored or given at the program, Texas facility rules for storage, daily counts of Schedule II to IV drugs and who may administer apply (26 TAC 564, subchapter J). Many outpatient programs keep no medication except naloxone.
• Records: psychiatric notes in an SUD program are part of the record protected by 42 CFR Part 2; sharing with an outside psychiatrist needs a Part 2 consent.

How much prescriber time you need

We didn't find a Texas rule that sets prescriber hours for an outpatient program, so size it from the work. This worksheet shows the method; the numbers are an example for a program averaging 20 clients with about 8 admissions a month, not a standard.

Work	How to estimate	Example, per month
New evaluations	Admissions × share needing an evaluation × visit length	8 × 75% × 60 min = 6 hours
Follow-up visits	Clients on medication × visits per month × visit length	14 × 2 × 20 min = about 9.5 hours
Urgent reviews	Positive risk screens and medication problems	2 hours
Coordination and charting	Calls with outside prescribers, OTPs and pharmacies; notes	4 hours
Team meeting and UR support	Weekly case review; peer-to-peer calls	3 hours

In this example, about 25 hours a month, or one half-day clinic a week plus coordination time. Put the visits where clients already are: the sample schedule in our kit reserves a block after group (2:20 to 3:00 in the day track) for individual sessions, case management and psychiatric visits, for PHP clients daily and IOP clients by appointment. See the IOP schedule template.

The physician's own time for chart review under the prescriptive authority agreement, policy sign-off and quality review is separate; our medical director guide has that worksheet.

The referral and safety workflow

1. Day 1 screen: suicide, violence and withdrawal risk, by a licensed clinician, plus the standard measures you repeat over time (the PHQ-9 and GAD-7 in most programs).
2. Referral triggers, written in policy: for example, any positive suicide screen, a current psychiatric medication, a co-occurring diagnosis, interest in MOUD, a moderate or higher PHQ-9 or GAD-7, or a counselor's concern. Each trigger has a timeframe.
3. Medication reconciliation at admission, at every change in level of care and at discharge, by the prescriber or a nurse.
4. Evaluation and plan: the prescriber's findings go into the treatment plan, not a separate silo, so the counselor's notes and the prescriber's notes tell the same story.
5. Same-day path for risk: a client who screens at risk is seen or reviewed the same day, with a safety plan and, when needed, 988, a mobile crisis team or 911. Our crisis procedure template spells out who to call and that an at-risk client is never left alone.
6. Weekly team review: prescriber, clinical director and counselors review new admissions, clients not improving on their measures, and upcoming discharges.
7. Discharge: the aftercare plan names the next prescriber and appointment, so medication, including any MOUD, continues without a gap. See discharge planning for an IOP.

Cima EHR for IOP and PHP has clients complete the PHQ-9 and GAD-7 on their phone, and any answer above "Not at all" on the PHQ-9 self-harm question puts a red safety card on the clinician's Today screen and emails them right away. E-prescribing is coming to the Prescriber plan.

Billing psychiatric visits next to a per diem

• The program's daily rate (for example H0015 for SUD IOP, S9480 for mental health IOP, S0201 for PHP) pays for the program's services. Our IOP and PHP billing codes guide lists them with the revenue codes.
• Prescriber visits are usually professional services billed under the prescriber's NPI with psychiatric evaluation or E/M codes. Some contracts include them in the per diem; others pay them separately. Read each contract and write the answer into your billing setup before the first visit.
• Credential the prescriber with every plan you bill, as an individual and linked to the program or group. NPs in Texas are credentialed with commercial plans, Medicare and Texas Medicaid; our credentialing service handles each plan.
• Medicare: freestanding programs generally can't bill Medicare for IOP or PHP, but a prescriber enrolled in Medicare can bill their own visits. For hospital and community mental health center programs, a physician certifies the need for the level of care (Medicare Benefit Policy Manual, chapter 6).
• Contracted prescribers: if the program bills for the prescriber's visits, the agreement says so (reassignment of benefits for Medicare), at a fair market value rate not tied to referrals.

PHP is different

A partial hospitalization program serves clients who would otherwise need inpatient care, so payers and accreditors expect more physician involvement than in IOP: the Medicare certification above is physician work, and commercial PHP medical policies often name physician or psychiatric evaluation requirements. Read each payer's PHP policy before you choose a model, and budget more prescriber time than the IOP worksheet shows. Our guide to starting a PHP covers the rest.

Already open? Consulting by the hour is $175 per hour, or book a free 30-minute call.

Questions

Does an IOP need a psychiatrist?

Not necessarily on staff, but it needs physician oversight of medical care and a way for clients to get psychiatric evaluation and medication management. Many IOPs use a psychiatric NP working with a physician medical director, telepsychiatry, or referral with coordinated care. Check your payer contracts for specific requirements.

Can a psychiatric nurse practitioner prescribe in an IOP in Texas?

Yes, under a prescriptive authority agreement with a physician. Schedules III to V can be delegated; Schedule II, which includes most ADHD stimulants, is limited to settings such as hospital facility-based practice and hospice.

Can an IOP use telepsychiatry?

Yes, with a prescriber licensed in Texas, a HIPAA-compliant platform with a business associate agreement, and attention to DEA rules for prescribing controlled substances by telemedicine, which are extended through December 31, 2026.

Are psychiatric visits included in the IOP per diem?

It depends on the contract. Many plans pay prescriber visits as separate professional services under the prescriber's NPI; some bundle them into the daily rate. Confirm with each plan before billing.

How soon should an IOP client see the psychiatrist?

Set a timeframe in policy for an evaluation "when indicated," with faster paths for risk: a client who screens positive for suicide risk is reviewed the same day. Check payer and accreditor timelines, which can be shorter, especially for PHP.

Sources

• Texas Occupations Code chapter 157 (delegation and prescriptive authority agreements)
• Texas Health and Safety Code chapter 481, section 481.0764 (PMP checks)
• Texas Medical Board, tmb.state.tx.us; Texas Board of Nursing, bon.texas.gov; DEA Diversion Control
• DEA and HHS, fourth temporary extension of telemedicine flexibilities (Federal Register, December 31, 2025)
• CMS, Medicare Benefit Policy Manual, chapter 6 (PHP and IOP certification)
• ASAM, The ASAM Criteria, 4th edition; eCFR, 42 CFR Part 2