Level of care is the decision that sets everything downstream in substance use disorder billing: the codes you bill, the rate you bill them at, whether the payer wants approval before the first day, and how often a reviewer will ask you to justify the next one. Get the level wrong on paper and a clinically correct admission becomes an administrative denial. This is how levels of care map to claims, where authorization starts, and what keeps days covered after admission.
What this covers
- ASAM levels set placement, and payers use them to judge medical necessity. Third Edition levels 0.5 through 4.0 are still the language most policies are written in.
- The authorization trigger is the level of care, not the diagnosis. Higher levels usually need approval before the first day of service.
- Under CMS-0057-F, impacted payers must decide expedited prior authorization requests within 72 hours and standard requests within 7 calendar days.
- Concurrent review is a deadline before it is a document. Miss it and days that were clinically appropriate come back unpaid.
- 42 CFR Part 2 governs the SUD record, so the consent that lets a payer see the chart is part of the billing packet, not an afterthought.
The level of care is a billing decision before it is a clinical one. If the record does not justify the level on the day billed, the claim fails no matter how good the care was.why placement and documentation cannot be separated
An SUD program bills differently at each point on the continuum. Outpatient visits bill per session. Intensive outpatient and partial hospitalization bill per diem or as a weekly rate. Residential and inpatient levels bill per day, and medication for opioid use disorder inside an opioid treatment program bills as a weekly bundle that already includes counseling and toxicology. The level of care selects the billing model, and the authorization follows the level. Billing staff who treat placement as a purely clinical question end up reconciling claims against a decision they never saw.
Levels of care and the codes behind them
The American Society of Addiction Medicine publishes the placement criteria that most payers apply. The ASAM Criteria, Third Edition runs from Level 0.5 early intervention through Level 4.0 medically managed inpatient, and that is still the version written into many payer policies and state provider manuals. The Fourth Edition, released in 2024 for adults, keeps the four broad levels and adds levels such as 1.5, 1.7 and 2.7, along with enhanced biomedical and co-occurring capable variants. When a policy still uses Third Edition language, map your findings to that language and keep the current assessment in the file.
The level of care also picks the code family and the payment model. Programs that bill across several levels carry several families in one billing system, and the specialties overview shows how those service lines sit together.
| ASAM level | Setting | How it usually bills |
|---|---|---|
| 0.5 Early intervention | Screening and brief intervention | Per screening or per visit |
| 1.0 Outpatient | Weekly therapy and medication management | Per session or per unit |
| 2.1 Intensive outpatient | 9 or more hours a week of structured treatment | Per diem or weekly rate, often H0015 or a payer code |
| 2.5 Partial hospitalization | 20 or more hours a week with daily clinical contact | Per diem, or PHP codes under condition code 41 |
| 3.1 to 3.5 Residential | 24-hour clinically managed living and treatment | Per diem |
| 3.7 Medically monitored inpatient | Withdrawal management with 24-hour nursing | Per diem |
| 4.0 Medically managed inpatient | Daily physician management in a hospital setting | Per diem or DRG |
The hours are a bright line for payers. ASAM describes Level 2.1 as 9 to 19 hours of clinical service a week, and Levels 2.5 and 3.5 as at least 20 hours. Medicare’s intensive outpatient benefit uses a 9 hour weekly minimum of its own, shown in the plan of care and certified by a physician. A claim that bills a level the service log does not support is a recoupment waiting to happen.
Third Edition levels 0.5 through 4.0 and Fourth Edition levels such as 1.5 and 2.7 do not always match one to one. Submit the level your payer’s policy names, and note the edition in the record so a reviewer is not comparing two different scales.
Where authorization starts
Authorization attaches to the level of care. Lower levels often bill without a prior approval. Higher levels rarely do. A state or plan sets the line, and the line moves. Montana Medicaid, for example, does not require prior authorization or continued stay review for partial hospitalization at Level 2.5. Virginia Medicaid requires authorization before service for most addiction treatment services, including Level 2.5. Read the policy for the level you are billing, not the policy for the program as a whole.
Commercial plans follow the same shape with their own thresholds. Evernorth uses the ASAM Criteria to review substance use levels of care across its health plan business, and it uses the MCG behavioral health guidelines for mental health levels instead. That split matters when a patient carries both a substance use and a mental health diagnosis, because the two reviews run on different criteria.
Parity law limits how a plan can design that gate. Under the Mental Health Parity and Addiction Equity Act, prior authorization is a non-quantitative treatment limitation, and a plan cannot apply it to mental health or substance use benefits more stringently than it applies the same gate to medical or surgical benefits in the same classification. The 2024 parity final rules tightened the comparative analysis a plan has to document, with the meaningful benefit standard taking effect for plan years starting on or after January 1, 2026.
Federal rule now sets a clock on the answer. Under CMS-0057-F, released January 17, 2024, Medicare Advantage organizations, Medicaid and CHIP fee-for-service programs, Medicaid and CHIP managed care plans, and qualified health plans on the federal exchanges must send prior authorization decisions within 72 hours for expedited requests and 7 calendar days for standard requests, beginning primarily in 2026. A denial has to state the specific reason.
The 72 hour and 7 day windows measure the payer’s response, not your submission. They do not create the documentation a reviewer needs to approve the admission. Build the packet before the first day whenever the level allows it.
What the initial authorization packet needs
A reviewer trained on ASAM reads the request against the six dimensions: intoxication and withdrawal risk, biomedical conditions, emotional and behavioral conditions, readiness to change, relapse potential, and recovery environment. An intake note that lists a diagnosis and a requested level gives the reviewer nothing to approve. The packet has to show which dimension drives the level and why a lower level would not be safe or effective.
State the ASAM level in the payer’s own language and note the edition the policy uses.
Record findings for each dimension with the evidence behind them, and say which dimension sets the requested level.
Explain why a less intensive level will not manage the current risk. That is the ASAM principle a reviewer checks.
Include a release that names the payer and the scope of records. A blank or generic release stalls the review.
For Medicare IOP, a physician must certify the need, and the plan of care must show the weekly hours.
A payer cannot review records it cannot lawfully receive. For a Part 2 program, the consent has to name the recipient and the records. Build the release into the intake, not into the appeal.
Concurrent review keeps days covered
Once a patient is in a higher level of care, coverage is renewed on a schedule. The cadence tightens as the level rises. Medically monitored inpatient is reviewed every few days, residential weekly to biweekly, and outpatient levels much less often. The exact interval is the payer’s, and it is usually shorter than a program expects. Track the review date next to the authorization number, per patient and per payer.
| Level | Typical review cadence | What the reviewer looks for |
|---|---|---|
| 3.7 to 4.0 inpatient | Every 1 to 3 days | Withdrawal stability, medical status, readiness to step down |
| 3.1 to 3.5 residential | Weekly, sometimes biweekly | Treatment response, engagement, progress on the discharge plan |
| 2.5 partial hospitalization | Weekly to biweekly | Skill use outside treatment hours, measurable progress, discharge planning |
| 2.1 intensive outpatient | Every 2 to 4 weeks | Attendance, engagement, movement toward a lower level |
A concurrent review is a deadline before it is a document. Submit the update before the current authorization lapses, not after the denial lands. Evernorth’s published concurrent review outline asks for updated withdrawal symptoms, progress in recovery skills, sober support and living arrangements, family sessions, barriers to discharge, and a discharge plan with 7 day follow up appointments. A note that says the patient is stable and attending groups answers none of it.
A record that shows steady progress with no remaining risk invites a step down. If the patient still needs the level, document the risk a lower level would not manage: recent use, cravings, untreated comorbidity, or an unsafe living situation.
Moving a patient between levels
A level change is a billing event. The authorization that covered the old level does not cover the new one, and the code family usually changes with it. When a patient steps up from intensive outpatient to residential, the claim moves from a per diem or weekly rate to a per day rate, and the payer needs the new level authorized before it is billed.
Medicare draws the boundaries clearly. An intensive outpatient claim carries condition code 92 and bills per diem. Medicare returns the claim to the provider when it overlaps a partial hospitalization claim with condition code 41, or when a line item date of service falls within 7 days before the start of another claim for the same patient and provider. Partial hospitalization codes G0410 and G0411 are not payable outside a partial hospitalization program.
Medication for opioid use disorder in a Medicare-enrolled opioid treatment program bills on its own model. The weekly bundles G2067 for methadone and G2068 for oral buprenorphine cover dispensing, counseling, therapy and toxicology in one payment, and they bill once per 7 contiguous days. Injectable buprenorphine G2069 and naltrexone G2073 bill once every 28 days. The take-home add-ons G2078 and G2079 are limited to 3 units in 28 days. Only an enrolled opioid treatment program may bill these codes, and the claim carries place of service 58.
The next level still needs its own authorization and its own medical necessity. Confirm the new level is open and covered before the discharge order is written, or the first days at the lower level bill without a home.
Documentation, consent and denial patterns
The record carries the claim, and for a Part 2 program the confidentiality rule adds a layer the rest of the chart does not have. The 2024 final rule aligned Part 2 with HIPAA and now permits a single consent for treatment, payment and health care operations, but it keeps limits that matter at billing. Records cannot be used to investigate or prosecute a patient without consent or a court order, SUD counseling notes need their own consent, and each disclosure has to include a copy of the consent or a clear statement of its scope. Compliance with the rule was required by February 16, 2026.
- Match every billed day to a note, a level of care and a current authorization.
- Keep the level of care in the note, in the payer’s language, on the date billed.
- Track each authorization’s start, end and review date in one place, per payer.
- Hold the consent that names the payer and the scope of records before the first disclosure.
- Separate SUD counseling notes and keep the specific consent that covers them.
- Log every denied day with the reason code and the reviewer’s stated basis.
Denials cluster in a few places: a level billed without authorization, a concurrent review that arrived late, a level the note does not support, and a per diem that does not match the service log. Each one is recoverable when the documentation exists and expensive when it does not. The tracking that prevents the denial is the same evidence an appeal needs. That loop is what behavioral health revenue cycle management is built around, and it is where denial management takes over when a review goes the wrong way.
Substance use disorder billing questions
The ASAM Criteria describe a continuum from Level 0.5 early intervention through Level 1 outpatient, Level 2 intensive outpatient and partial hospitalization, Level 3 residential, and Level 4 medically managed inpatient. Most payer policies are still written in Third Edition levels such as 2.1, 2.5, 3.1, 3.5, 3.7 and 4.0. The Fourth Edition, released in 2024 for adults, adds levels such as 1.5, 1.7 and 2.7 and keeps the four broad levels.
It depends on the payer and the level. Outpatient services often bill without prior approval, while residential and inpatient levels almost always require it. States set their own lines. Montana Medicaid does not require prior authorization or continued stay review for Level 2.5 partial hospitalization, and Virginia Medicaid requires authorization before service for most addiction treatment levels. Confirm the threshold in the payer policy before the first day of service.
Under the CMS Interoperability and Prior Authorization final rule, CMS-0057-F, impacted payers must send prior authorization decisions within 72 hours for expedited requests and 7 calendar days for standard requests, beginning primarily in 2026. The rule covers Medicare Advantage, Medicaid and CHIP fee-for-service programs, Medicaid and CHIP managed care plans, and qualified health plans on the federal exchanges. A denial must state the specific reason.
Concurrent review is the payer’s periodic check that a patient still meets medical necessity for the current level of care. The cadence tightens as the level rises, from every one to three days at medically monitored inpatient to every two to four weeks at intensive outpatient. The provider submits updated clinical information before the current authorization lapses. Missing the deadline is the most common reason clinically appropriate days come back unpaid.
Medicare covers intensive outpatient program services under a benefit created by the Consolidated Appropriations Act of 2023 and effective January 1, 2024. Claims carry condition code 92 and bill per diem under the Outpatient Prospective Payment System. A physician must certify the need, the plan of care must show at least 9 hours of service a week, and the patient must be able to take part in treatment. Medicare returns the claim when it overlaps a partial hospitalization claim.
Medicare pays an enrolled opioid treatment program through weekly bundled codes. Code G2067 covers methadone and G2068 covers oral buprenorphine, and each bills once per 7 contiguous days and includes dispensing, counseling, therapy and toxicology testing. Injectable buprenorphine, G2069, and naltrexone, G2073, bill once every 28 days. The claim carries place of service 58, and only an enrolled opioid treatment program may bill these codes.
No. The 2024 final rule aligned Part 2 with HIPAA and permits a single patient consent for treatment, payment and health care operations, so a payer can receive the record for billing. The limits still matter. Records cannot be used to investigate or prosecute a patient without consent or a court order, SUD counseling notes need their own consent, and each disclosure has to include the copy of the consent or a clear statement of its scope.
The bottom line
Level of care is the hinge between the clinical decision and the claim. Name it in the payer’s language, authorize it before the first day, and renew it on the payer’s clock. Programs that run that loop collect for the care they already deliver. Programs that do not spend their time appealing days that were never going to pay.
Are your SUD claims matching the level of care you billed?
Send one month of authorizations and the claims they cover. The MedFactor team will map each level of care to its authorization window and review date, flag the days billed without coverage, and show what the fix is worth across your payer mix.
Request a free SUD billing reviewThis article describes general SUD billing, authorization and confidentiality rules rather than legal or state-specific advice, and coverage, code and consent requirements are set by each payer and state Medicaid agency, so confirm them against the policy in effect on the date of service.
