Who We Serve

Specialized for the revenue cycles behind complex behavioral-health care.

Axis serves behavioral-health organizations with complex revenue cycles, including RTC, detox, PHP, IOP, multi-level treatment providers, and organizations submitting institutional claims. We're the strongest fit when you've got steady claim volume, tricky authorization and utilization review, several payers, and denials, aged receivables, or underpayments piling up.

A patient's level of care begins with a clinical assessment and treatment recommendation. The payer then applies the member's benefits, medical-necessity criteria, authorization requirements, and continued-stay review — and that is where the revenue cycle either holds together or starts to leak.

RTC & Detox PHP & IOP Multi-level providers Institutional (UB-04)

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Deep specialty in

Detox — medically managed withdrawal
RTC — 24-hour residential treatment
PHP — partial hospitalization
IOP — intensive outpatient
Institutional (UB-04) claims

We also take on outpatient, telebehavioral, community-based and specialty providers when the volume and payer complexity call for full-service billing.

It's about the people in the room

Your team treats. We protect the revenue that keeps the doors open.

Behind every claim is a patient mid-treatment and a clinician doing the work. Getting the billing right means care can continue — that's the whole reason we sweat the codes, the auth windows, and the underpayments.

One lapsed authorization can end a stay. We treat every day of care like it matters, because it does.

Levels of Care

Billing detail, level by level.

Each level of care carries its own revenue codes, unit logic, authorization cadence, documentation demands, and denial patterns. Here is where the money most often leaks — and where we focus first.

Residential (RTC)

24-hour residential treatment. Per-diem billing where date-span integrity is critical and one gap between concurrent reviews can strand a stay.

Revenue codes: Typically 1001 / 1002 (per diem) — payer-specific
Units: Per diem; date-span integrity is critical
Authorization: Prior auth plus concurrent review at intervals
Documentation: Medical-necessity, level-of-care criteria
Common denials: Auth lapse between concurrent reviews, day-count mismatches, missing medical necessity
Underpayment risk: Per-diem paid below contracted rate

UB-04Per diem

See UB-04 institutional billing →

Detox

Medically managed withdrawal. Short, intense lengths of stay with urgent authorization windows and tight timelines that punish any delay.

Revenue codes: Typically 0116 / 0126 / 1002 — payer-specific
Units: Per diem; short, intense length of stay
Authorization: Urgent / concurrent auth; tight timelines
Documentation: Withdrawal severity, monitoring intensity
Common denials: Level-of-care downgrades, retro auth, severity not documented
Underpayment risk: Per-diem carve-outs and downgraded day rates

UB-04Per diem

See UB-04 institutional billing →

PHP

Partial hospitalization. Per-diem or hourly billing gated by minimum daily-hour thresholds, with concurrent review that hinges on frequency.

Revenue codes: Typically 0912 / 0913 — payer-specific
Units: Per diem or hourly; minimum daily-hour thresholds
Authorization: Auth plus concurrent review on frequency
Documentation: Hours of service, group / individual mix
Common denials: Below minimum service hours, frequency limits, step-down timing
Underpayment risk: Per-diem vs. fee-schedule confusion

UB-04Per diem / hourly

A closer look at PHP billing →

IOP

Intensive outpatient. Per-session billing with weekly frequency caps and renewal cadence — where session rates and bundling errors quietly erode revenue.

Revenue codes: Typically 0905 / 0906 — payer-specific
Units: Per session; weekly frequency caps
Authorization: Auth by sessions / weeks; renewal cadence
Documentation: Session attendance, modality, progress
Common denials: Frequency exceeded, missing progress notes, out-of-network routing
Underpayment risk: Session rates below contract, bundling errors

UB-04 / 1500Per session

A closer look at IOP billing →

The cycle behind every level of care

Benefits & VOB
Authorization & UR
Clean claims
Appeals & recovery
Care continues.

Institutional Claims

UB-04 behavioral-health billing is its own competency.

Institutional claims live or die on revenue-code accuracy, value / occurrence / condition codes, type-of-bill logic and date-span integrity — areas where general medical workflows may not capture behavioral-health-specific requirements.

/01

Type of bill

Facility and frequency logic set correctly so claims are neither rejected nor duplicated.

/02

Revenue + HCPCS pairing

Line-level integrity so each service maps to the code that pays it.

/03

Value / occurrence / condition codes

The behavioral-health-specific codes payers use to adjudicate — complete and consistent.

/04

Date-span & day-count

Reconciliation that keeps per-diem stays whole across concurrent reviews.

Scope & limitations

What we do — and what stays with your clinical team.

Axis IRG does not make clinical placement or level-of-care decisions. Those determinations belong to your clinical team and treating providers. Our work is the revenue cycle behind the care your team delivers.

The revenue codes, unit logic, authorization cadence, documentation and denial patterns described on this page are illustrative and commonly seen in behavioral-health billing. They are not payer instructions. Actual requirements vary by payer, plan, state, contract and date of service, and change over time. We confirm the specifics for your organization before we act on them.

Level-of-care questions

What operators ask about billing by level of care.

We run detox through IOP under one roof. Can you bill all of it?

Yes, that whole ladder is squarely what we do: detox, RTC, PHP, IOP, multi-level treatment providers, and institutional (UB-04) claims. We also take on outpatient, telebehavioral, community-based and specialty programs when the volume and payer complexity call for full-service billing.

Is billing really that different from one level of care to the next?

More than you'd think. Each level carries its own revenue codes, unit logic, authorization cadence, documentation demands, and denial patterns, and those differences are where the money most often leaks. RTC and detox bill per diem, PHP runs per diem or hourly with minimum daily-hour thresholds, and IOP is per session with weekly frequency caps.

Where do denials usually hit at each level of care?

Mostly on authorization, frequency, and documentation, though the exact pattern shifts by level. RTC denials tend to come from auth lapses between concurrent reviews, day-count mismatches, and missing medical necessity. Detox, with its urgent auth windows, sees level-of-care downgrades and severity-not-documented denials, while PHP gets caught below minimum service hours or on frequency limits and IOP loses claims to exceeded frequency, missing progress notes, and out-of-network routing. Those are the common patterns, not payer rules; the specifics vary by payer, plan, and contract.

Can you handle UB-04 institutional claims, or just professional billing?

We handle UB-04 work, and we treat it as its own competency. Institutional claims live or die on revenue-code accuracy, value, occurrence and condition codes, type-of-bill logic, and date-span integrity. Those are exactly the areas where general medical workflows may not capture behavioral-health-specific requirements.

Will you be involved in deciding what level of care a patient gets?

No. Clinical placement and level-of-care decisions belong to your clinical team and treating providers, full stop. Our work is the revenue cycle behind the care your team delivers, from benefits verification and authorization through clean claims, appeals, and recovery.

How do we know if our program is a good fit for Axis?

The strongest fit is a program with steady claim volume, tricky authorization and utilization review, several payers, and denials, aged receivables, or underpayments piling up. If that sounds familiar, send us the levels of care you bill and the payers giving you the most friction. We'll review the claim quality, denials, and underpayment exposure and show you where the revenue is leaking.

Billing across multiple levels of care?

We map every one.

Send us the levels of care you bill and the payers giving you the most friction. We'll review the claim quality, denials and underpayment exposure, and show you where the revenue is leaking.

Request a Billing Review → See our appeals work →

Last updated: July 5, 2026