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Behavioral-health revenue intelligence,
built from field experience.

For years our partners have written guides and answered real billing questions straight from the day-to-day of behavioral-health revenue-cycle work. We keep that material for its history, and we review, source, and update the guides that still matter.

  • RTC · PHP · IOP
  • Authorization
  • Claim forms
  • Payer routing
  • Medical necessity
  • Denials

Where the rules get written

Reviewed & maintained

Definitive Guides

Repeatable frameworks

Axis Methods

How payers behave

Payer Field Notes

Every article, labeled

The Library & Archive

The library & archive

Every article, one place.

Current work sits alongside years of archived guidance, because payer problems repeat. Each entry carries its focus, its original year, and a label for how far to trust it today.

Start here

Medical-Necessity Denials in Behavioral Health

How behavioral-health medical-necessity denials work, what documentation matters, and how providers can build stronger appeal packets.

By Peter Busch · Jul 2026Read the guide →
Every Axis IRG article with its focus area, original publication year, and review status
ArticleFocusYearStatus
Closer Look At IOP Billing For Behavioral Health Service ProvidersHow IOP billing requirements shifted across major commercial payers - UHC, BCBS, Cigna, Aetna - and what it takes to keep per-session claims clean as the rules move.Levels of Care2025Updated
Increasing Reimbursement While Decreasing Claim DenialsThroughout the whole process, there are key elements in ensuring success with revenue collections that we will cover in this article. Finding the right people to facilitate and…Denials & Appeals2021Updated
The Secret to Getting Reimbursed Quicker – Claims Follow UpSpeedy resolution of your behavioral health facility claims all depends on effective collections follow up. Follow up on all claims should begin as soon as 7 to 10 days after your…Claims & Filing2018Updated
Medication Assisted treatment Codes for MedicaidWe will use New Hampshire as an example here for medication assisted treatment codes medicaid and the managed care organizations. Medication-assisted treatment (MAT) codes…Coding2025Superseded
Primary and Secondary Insurance Claims Filing. A Step by Step Guide.Filing Insurance Claims for Medicare Primary & Secondary Mental Health Care Navigating the complexities of insurance claims can be challenging, especially when dealing with…Claims & Filing2025Archived
Insurance Billing for Substance Abuse and Mental Health Cheat SheetThe most common CPT Codes used by professional clinicians and therapistsClaims & Filing2025Archived
Correct H0015/IOP or PHP Substance Abuse Claims that are DeniedIf your H0015 / IOP claims are denying for CO-197 / No Prior Authorization, normally this code does not require auth, but H0015 TG/PHP does. After working with a rep at…Denials & Appeals2025Archived
The “Medical Necessity” Game in Behavioral HealthIn our experience, we have seen most approvals or denials of treatment based on the principal of medical necessity. Half of the information needed by insurance companies to…Denials & Appeals2025Archived
How to Write A Referral Letter for PHP Mental Health?Before creating your template for referring to PHP or other levels of care for behavioral health, it is good to remember some basic medical necessity criteria from insurance.…Authorization2023Archived
7 Aspects Every Behavioral Health Facility Should Know About BillingSeven parts of the insurance-billing workflow, from verification of benefits at admission through claims work and follow-up.Operations2023Archived
Can Psych Visits be Billed Along with a Per Diem IOP Visit? How?Again, here are a few scenarios to consider:Coding2023Archived
A General Look at 2023 Medical Necessity Criteria for Behavioral HealthAccess to the ASAM Criteria can be found by clicking here.Denials & Appeals2023Archived
New Closer Look at PHP Billing For Behavioral Health Service Providers…This is a Positive ThingA walk through partial-hospitalization billing for behavioral-health providers — what the day-treatment model means for claims, written as demand for mental-health services was climbing.Levels of Care2023Archived
Here’s What an Industry Insider Says About Third Party Insurance BillingWhen you think of insurance billing, you probably think of some nice sweet receptionist type person in your doctor’s office taking your insurance card before your appointment…Operations2023Archived
What is the Limit for Number of Patients for a PHP or IOP Behavioral Health Treatment Program?There are a lot of variables to insurance billing, each policy of a plan needs to be vetted and checked for limitations and criteriaOperations2023Archived
How to get Reimbursement for IOP S9480 via TelehealthHow is this indicated on the claim form? S9840 is a Healthcare Common Procedure Coding System (HCPCS) code used for telehealth services. However, whether or not insurance…Coding2023Archived
One Common Insurance Billing Mistake for the Substance Abuse Code for Non-intensive Outpatient Groups for Behavioral HealthHere is the common mistake, not adding the correct modifier. Often times it could possibly be done to use modifier 59 to do 2 groups on the same day, however most carriers…Coding2023Archived
How to do an Authorization for Behavioral HealthPrepare for the call and make SURE to input all necessary information at the step in the system. Remember, do all work at the steps. Confirmatory Questions1. Patient…Authorization2023Archived
UHC Direct Pay Issue for Behavioral HealthIs this true from UHC?Payer Behavior2022Archived
RTC – PHP – IOP Insurance Billing 101What is a UB04?Levels of Care2022Archived
This Can’t be Right: UBH/Optum Discontinuing Out of Network BenefitsThe change will apply to medical and behavioral health services and impacts services that are already subject to prior authorization.Payer Behavior2021Archived
Are You Correctly and Accurately Coding For Mental Health Services?Nowadays, entities like behavioral health facilities are far more prone to denials and payer scrutiny more than any other medical coverage a patient may have. This puts mental…Coding2021Archived
PHP and IOP Billing for Eating DisordersHow PHP and IOP day-treatment models apply to eating-disorder care, and what that structure means for billing the stay correctly.Levels of Care2021Archived
What you need to know for PHP insurance billing in 2023What You Need to Know for PHP Insurance Billing in 2023 A partial Hospitalization Program (day hospitalization) is a structured day program providing several hours of therapy…Levels of Care2021Archived
Eating Disorder Codes for Insurance BillingInsurance covers eating disorders just like substance abuse depression and anxiety We are experts at knowing the right codes for the right diagnosis and carrier. We have a…Coding2021Archived
Understanding Insurance Issues for Eating DisordersUnderstanding Insurance Issues For Eating Disorders Navigating an insurance billing for eating disorders can be a nuisance if you do not know what to do or where to “touch.”…Coverage2021Archived
Denied Insurance Coverage For Mental Health Illness Drawing More AttentionFamilies are suffering from the strict system placed on behavioral health insurance processes. A system that fails the needs of people who need it the most, because of not…Denials & Appeals2018Archived
5 Things to Know when Outsourcing Insurance BillingSo you think to yourself, “ How good it would be if I could just focus more on treating patients, and not have to worry about back office practices. ” Well I have a solution…Operations2018Archived
5 Insurance Billing Errors Drug Treatment Centers Can AvoidIs your treatment center experiencing financial difficulties? There are many billing errors that can cause claims to be denied. Payments being delayed, incurring fines, and…Claims & Filing2018Archived
Revenue Cycle Management Tips and Tricks – Behavioral HealthRevenue Cycle Management 101Operations2017Archived
How Accurate Insurance Billing Can Improve Patient OutcomesYou may be surprised to know that patients often associate your professional services with things completely removed from obtaining treatment for their addiction or mental…Operations2016Archived
Why You Need to be Aware of Incident ReportsWhat is often not understood is how important this documentation plays a part in making sure all benefits are getting utilized from insurance carriers.Documentation2015Archived
How Much Control do you Have Over Denial of Benefits?As we all know, they are not all created equal and these are HUMAN choices – not policy.Denials & Appeals2013Archived

Article labels

  • Current & reviewed
  • Updated
  • Archived
  • Superseded

Archive notice: Older Axis publications and community answers may reflect the payer rules, state requirements, coding guidance, systems, and information available when they were written. Current requirements should be verified for the applicable payer, plan, state, contract, provider, and date of service. On community discussion: Questions and replies reflect general operational discussion and are not individualized legal, clinical, coding, accreditation, or coverage advice.

Built from real work

Guidance grounded in operations, then checked against current sources.

Our knowledge base preserves that field experience while reviewing current guidance against payer documents, government sources, recognized standards, and transaction evidence — with limitations clearly stated.

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30+ Years

Combined behavioral-health operations, provider, payer, and revenue-cycle experience.

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Facility-Specific Experience

RTC, detox, PHP, IOP, multi-level treatment, authorization, and institutional claims.

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Years of Public Guidance

Partner-authored articles and public answers addressing real facility and billing questions.

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Current Source Review

Priority guidance is re-checked against current sources before we rely on it.

Featured article · Denials & Appeals

Medical-Necessity Denials in Behavioral Health.

Few phrases decide more revenue than "not medically necessary." It sounds clinical and final. In behavioral health it is often neither — it is a plan- and product-specific determination you can document against and appeal. By Peter Busch · 6 min read.

Read the article →
  1. 01Documentation
  2. 02Criteria
  3. 03Appeal strategy

Definitive Guides

Priority guides, reviewed and sourced for current use.

The deep-dive guides operators ask for most are being rebuilt against current payer rules. The guidance itself already lives on this site — start here.

Axis Methods

The structured methods behind the work.

Our repeatable frameworks for diagnosing stuck claims and prioritizing the work most likely to produce a supportable result.

Payer Field Notes

How we track what a payer actually does.

Payer behavior rarely matches the manual. We record every pattern the same way, so a rule change becomes a revenue action instead of a denial you find out about later.

What every payer note captures

Payer & plan
The carrier and product line where the pattern shows up.
State
Coverage rules and enforcement vary from one state to the next.
Issue
The specific friction — concurrent-review timing, a level-of-care downgrade, a frequency cap applied early.
Source
Payer manual, policy bulletin, or remittance evidence.
Resolution path
How it gets worked: documentation, the right appeal level, or a contract escalation.
Review cadence
When we re-check the rule, so we catch a change before it costs you a claim.

The friction we watch for

Concurrent-review timing Level-of-care downgrades Frequency & unit caps Prior-auth renewal gaps Out-of-network routing Remittance & underpayments Medical-necessity shifts

These are the behaviors that quietly erode behavioral-health revenue. We map where each one hits your book — and what it is worth to fix.

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Send a little context and we'll show you where to focus first — which claim issues are worth correcting now, and what they're likely worth. A focused diagnostic, not a sales call.

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Last updated: July 5, 2026