Table of Contents
Ready to See Results?
From strategy through execution, Atlantic Health Strategies integrates compliance, operations, and growth into durable, measurable results. Let’s put our expertise to work for your organization.
The short answer for operators billing PHP today
Under the ASAM Criteria, 4th Edition, Partial Hospitalization is Level 2.5, renamed High-Intensity Outpatient (HIOP). It is an outpatient level of care, not residential, and CMS requires a minimum of 20 hours per week of therapeutic services for a patient to qualify for the PHP benefit under 42 CFR 410.43.
ASAM says the quiet part out loud in its own FAQ. Asked whether PHP has been eliminated, ASAM answers: “No. However we are using different terminology. High Intensity Outpatient is used to refer to Level 2.5.” The society then adds that “PHP is a misnomer as these services are not delivered in a hospital setting” (ASAM Criteria FAQ).
Here is what trips operators up. The 4th Edition kept the 2.5 decimal but renamed the level. Per ASAM materials disseminated by state Medicaid agencies, Level 2.5 and Level 3.5 programs provide at least 20 hours per week of clinical services, while Level x.7 programs are medically managed and led by medical staff (ASAM 4th Edition summary, Colorado HCPF). If your clinical team is documenting medical-management hours at what your contract still calls PHP, your UR director should confirm which level and which edition the payer is actually applying, per contract, per state, per line of business.
The 20-hour rule, CMS, and where the audit trail starts
The 20-hour PHP threshold is not an ASAM invention. It is a Medicare patient-eligibility requirement. CMS regulations at 42 CFR 410.43(c)(1) state that PHP is intended for patients who require a minimum of 20 hours per week of therapeutic services as evidenced in their plan of care. Commercial payers borrow the same number, then layer their own LOC guidelines on top.
Two CMS facts operators get wrong all the time:
- PHP is outpatient. Full stop. 42 CFR 410.2 defines PHP as a distinct and organized intensive ambulatory treatment program that offers less than 24-hour daily care other than in an individual’s home or in an inpatient or residential setting. If your state license puts beds in the building, you do not get to call those bed-days PHP.
- The initial psychiatric evaluation with H&P must be in the chart. Per CMS Local Coverage Determination L33626, the initial psychiatric evaluation with history and physical establishes medical necessity, and if the patient is stepping down from an inpatient psychiatric admission, the prior evaluation with appropriate update is acceptable. Miss that documentation window and your auditor will find the gap.
One more thing worth calling out from L33626, because clinicians misread it constantly: the 20-hour-per-week requirement is a patient-eligibility requirement for the PHP benefit, and not a weekly-hours billing requirement. Read that twice. It is about eligibility to be in the benefit. It does not mean you get to short-hour the schedule. Commercial payers verify actual delivered hours through attendance logs, group sign-in sheets, and progress notes.
ASAM’s 4th Edition FAQ also confirms that Readiness to Change no longer contributes independently to the recommended level of care and instead informs clinical judgments about risks in other dimensions (ASAM Criteria FAQ). UR reviewers at Optum and Anthem flag charts where old Dimension 4 language still justifies placement instead of guiding treatment planning, which is exactly the shift ASAM’s 4th Edition materials describe.
Wit v. UBH, payer LOC guidelines, and why this matters to your AR
If you operate a PHP and bill commercial plans, you should know exactly where Wit v. United Behavioral Health stands. In the 2019 district court decision, the court found UBH had used defective medical necessity criteria for a class of over 50,000 members, and the Wit court later required UBH to reprocess 67,000 mental health and substance use disorder treatment claims after employee training on generally accepted standards of behavioral health care.
Then the Ninth Circuit walked it back. In its 2022 order and the 2023 amended memorandum, the appellate panel reversed portions of the district court’s judgment on the denial-of-benefits claim, giving UBH broader discretion under the ERISA plans. The case kept moving on remand. The Kennedy Forum reports that on February 3, 2026, the District Court extended its injunction for five more years, requiring UBH to use ERISA coverage criteria that reflect generally accepted standards of care through February 3, 2031 (The Kennedy Forum).
The operator takeaway does not change. Do not assume your commercial payer’s interpretation of ASAM matches yours. Your UR director should pull the LOC guideline language out of each payer contract and map every PHP denial reason back to the specific guideline the payer cited. My team has watched Optum, Aetna, and Anthem apply different definitions of “active treatment” inside what is supposed to be the same Level 2.5.
Enforcement risk: DOJ recoveries and level-of-care misplacement
The False Claims Act exposure for PHP and IOP misplacement is not theoretical. On January 16, 2026, DOJ announced that False Claims Act settlements and judgments exceeded $6.8 billion in the fiscal year ending September 30, 2025, the highest single-year total in the history of the statute, with over $5.7 billion tied to healthcare matters. Whistleblowers filed 1,297 qui tam lawsuits in FY 2025, breaking the prior record of 980 set in FY 2024 (DOJ press release). Deputy Attorney General Todd Blanche said the FCA “remains one of the government’s most powerful weapons against fraud.”
Behavioral health is squarely in scope. In September 2024, DOJ announced that Acadia Healthcare will pay $19.85 million to resolve alleged False Claims Act violations for medically unnecessary inpatient behavioral health services, with roughly $16.66 million going to the federal government and $3.19 million to Florida, Georgia, Michigan, and Nevada (Behavioral Health Business). DOJ alleged that Acadia admitted Medicare, Medicaid, and TRICARE beneficiaries who were not eligible for inpatient treatment and did not discharge them when they no longer needed that level, and further alleged staffing failures that led to assaults, elopements, and suicides.
The pattern is the same every time my team runs an operational audit at a residential or PHP site. Census pressure pushes clinicians to keep patients at a higher level of care than the dimensional assessment supports. UR signs off. Billing fires the claim. Twelve months later, the recoupment letter arrives.
The three documentation gaps my team sees most often that produce LOC-misplacement claims:
- PHP weekly hours documented in the schedule but not actually delivered, with no reconciliation between attendance, group notes, and the claim.
- Treatment plans that never get updated when a patient stops meeting Level 2.5 dimensional criteria and clinically should step down to Level 2.1 (IOP).
- Discharge weeks billed as full PHP weeks when the patient attended two or three days.
How state licensing layers on top: Florida, Pennsylvania, Kentucky
State licensing rules layer on top of ASAM heavily, and they vary.
- Florida. AHCA licenses behavioral health facilities and DCF licenses substance abuse providers, so PHP rules depend on the population you serve and which agency wrote the license on your wall.
- Pennsylvania. DDAP regulates SUD treatment with its own licensure standards operators must reconcile against ASAM.
- Kentucky. The state moved early on 4th Edition adoption and has publicly signaled implementation through its Medicaid and behavioral health authorities.
Illinois has also begun mapping licenses from 3rd Edition to 4th Edition levels through IDHS/SUPR guidance. Operators should read your state provider manual every time it updates and align admission criteria, weekly-hour minimums, and discharge documentation to the most restrictive applicable standard. If the payer contract still says 3rd Edition and your state adopted the 4th, your UR director owns that reconciliation, in writing, per patient.
Operators inheriting PHP programs through acquisition should treat the ASAM 4th Edition transition as an M&A diligence item, not a training memo. Pull the last 12 months of PHP claims. Reconcile scheduled hours against delivered hours against paid claims. Look at every step-down from residential to PHP for a documented dimensional reassessment. That is where the recoupment risk lives, and it is what my team looks at first when we open an audit file on a target.
Frequently asked questions
Is PHP still called PHP under the ASAM Criteria 4th Edition?
The clinical level is now Level 2.5: High-Intensity Outpatient (HIOP). ASAM’s own FAQ confirms PHP has not been eliminated; the terminology changed, and ASAM notes that PHP is a misnomer because these services are not delivered in a hospital setting. Operators should update internal policies, EMR forms, and payer-facing documents to reflect the HIOP name, while keeping PHP terminology alive where CMS regulations, state licensure, and existing payer contracts still use it.
How many clinical hours per week does CMS require for PHP, and is that a billing threshold?
CMS regulations at 42 CFR 410.43(c)(1) require a minimum of 20 hours per week of therapeutic services as evidenced in the plan of care. CMS LCD L33626 clarifies this is a patient-eligibility requirement for the PHP benefit, not a weekly-hours billing requirement. Commercial payers verify actual delivered hours through attendance logs, group sign-in sheets, and progress notes showing the modality and duration of each service.
Can a patient step down from residential directly to PHP?
Yes. Under 42 CFR 410.43 and CMS LCD L33626, patients discharged from an inpatient hospital treatment program can enter PHP in lieu of continued inpatient treatment, provided there is documented evidence of the need for the acute, intense, structured combination of services PHP provides. The discharge summary from the higher level of care must explicitly support the step-down against ASAM dimensions, and the PHP admission assessment must reassess against current presentation, not copy the residential record forward.
What is the actual enforcement risk if we misplace patients at PHP?
DOJ recovered more than $6.8 billion in False Claims Act settlements and judgments in FY 2025, with over $5.7 billion from healthcare matters, and whistleblowers filed a record 1,297 qui tam suits. Behavioral health providers are firmly in scope: Acadia Healthcare paid $19.85 million in September 2024 to resolve allegations of medically unnecessary inpatient behavioral health services, including admitting patients who were not eligible and keeping them longer than clinically necessary. Level-of-care misplacement claims at PHP typically originate from three documentation gaps: unreconciled weekly hours, treatment plans not updated at step-down, and discharge weeks billed as full PHP weeks.
References
- American Society of Addiction Medicine. ASAM Criteria FAQ (4th Edition)
- American Society of Addiction Medicine. ASAM Criteria 4th Edition Overview
- Colorado HCPF. ASAM Criteria 4th Edition Disseminate Summary (PDF)
- Electronic Code of Federal Regulations. 42 CFR 410.43 (Partial Hospitalization Services)
- CMS Local Coverage Determination L33626. Psychiatric Partial Hospitalization Programs
- U.S. Department of Justice. False Claims Act Settlements and Judgments Exceed $6.8B in FY 2025 (Jan. 16, 2026)
- Behavioral Health Business. Acadia to Pay $19.85M FCA Settlement (Sept. 26, 2024)
- The Kennedy Forum. Wit v. United Behavioral Health case tracker
- Psych-Appeal. Federal Court Orders 10-Year Injunctions and Reprocessing of 67,000 UBH Claims