Encounter-level test
Payment integrity measured per visit against each payer's rate; a paid encounter with an unpaid add-on is never a denial.
Home / Case studies / Mental health
Case study · Behavioral health FQHC · Diagnostic
One encounter, not two: the two behavioral health billing rules that cost a health center cash
Short answer: thirteen months of behavioral health visits showed two rules no fee schedule states plainly: a same-day E/M and psychotherapy visit pays once, and the county carve-out payer closes its filing window in half the time the Medicaid plans do. Diagnostic; nothing here is a recovery.
DOS Jul 2025 to Jul 2026
42 CFR 405.2463
90 days vs 180 · filing windows
Archetype
BH FQHC
Period
Jul 2025 to Jul 2026
Unit of test
The encounter
Rule
42 CFR 405.2463
Clock
90 vs 180 days
Status
Diagnostic
287accounts
Same-day E/M and psychotherapy: one encounter or zero paid, never two
90days
Carve-out filing window, against 180 for the Medicaid plans
$419K
Past-deadline behavioral visits with that one payer
345visits
Behavioral Medicare visits unpaid; 25 more below the floor
Every visit against what each payer paid
The same health center whose four-month denial result is published separately. We tested every visit from July 2025 to July 2026 at the encounter, because health center payers pay one rate on the first qualifying line and zero on the rest.
| Rule | Evidence in the remits | Exposure |
|---|---|---|
| Same-day E/M plus psychotherapy in a behavioral department pays once | 287 accounts; every one paid one encounter or zero, never two | False 'second encounter unpaid' flags; wasted appeals |
| Behavioral Medicare visits need a routing and practitioner-type check | 345 visits not paid, 25 paid below the floor | Whole-visit losses on the Medicare line |
| The county carve-out payer closes at 90 days from date of service | Medicaid plans allow 180; the carve-out allows 90 | $419K of visits already past deadline |
One encounter, not two
ViewWhat it seesWhat the remits say
Line-level reportCPT by CPT
SeesA medication-management E/M plus a psychotherapy add-on: two billable services; the unpaid second flagged as a denial
Remits287 accounts: one encounter rate or nothing, never two. The second line is absorbed into the encounter, not denied
Encounter testper visit, per payer
SeesOne visit, paid at the payer's rate or not
ResultNo wasted appeal; a letter for the absorbed line damages credibility
Medicare line42 CFR 405.2463 [1]
RuleMedical plus mental health visit same day: separately payable; same-kind encounters: one visit
Remits345 visits unpaid, 25 below the floor: routing and practitioner-type setup, not the clinic
Behavioral Medicare visits that did not pay as expected
July 2025 to July 2026
345Not paid93% of the 370
25Below the floor7%
Same-day E/M and psychotherapy, 287 accounts
Encounters paid per account
287Paid one or zero100%
0Paid two0%
Takeaway
Test payment at the encounter, not the line. A behavioral visit that paid once is paid in full; the unpaid second line is not a denial.
The 90-day clock
Behavioral health in this state runs through a county carve-out payer, not the Medicaid plans that pay the medical visits. The billing calendar was built around 180 days; aged against each payer's own limit, $419K at the carve-out payer was already past deadline.
Filing windows from date of service, by payer type
County behavioral carve-outthe payer holding $419K past deadline
90 days50% of the MCO window
Medicaid managed care plansthe medical visits
180 dayswhat the calendar assumed
Federal Medicaid outer limit42 CFR 447.45 [2]
12 monthsthe ceiling, not the payer's clock
090180365 days
Carve-outMCOFederal ceiling
| Finding | Owner | Action |
|---|---|---|
| Same-day E/M plus psychotherapy flagged as unpaid | Billing analytics | Suppress the flag; test payment at the encounter level |
| Behavioral Medicare visits unpaid or below floor | Enrollment and claim routing | Verify practitioner type and claim form routing per visit |
| Carve-out visits aging toward 90 days | Billing operations | Payer-specific filing calendar; carve-out claims released first |
| Visits already past the 90-day deadline | Client leadership | Dispute where the first-claim date was inside the limit; reserve the rest |
Assessment and testing codes behave differently
The encounter rule is a health center problem; the lesson is general. In a separate multi-state ABA and pediatric therapy nonprofit reviewed the same month, psychological testing 96131 collected 56% of contract value, the worst code in that book, and assessment 97151 collected 72%. Assessment and testing gate every later authorization, so they matter more than their size.
Collection on contract value by code, a separate multi-state behavioral and therapy book
96131 psychological testingworst code in the book
56%44% of contract value uncollected
97151 behavior assessmentgates every later authorization
72%28% uncollected
025%50%75%100%
TestingAssessment
How the two rules changed the work
Payer-specific filing calendar
Each payer's own deadline in the worklist; carve-out claims released ahead of the 180-day payers.
Dispute only where the facts hold
A timely filing dispute only when the first-claim date was inside that payer's limit; the rest to the reserve decision.
Medicare behavioral routing
Unpaid and below-floor visits worked as a routing and practitioner-type queue, not appeals.
Diagnostic, not cash recovered
- $419KThe $419K past the carve-out deadline is a dispute-or-reserve decision, not a forecastAcross the whole unpaid-visit review, only about 5% ($180K) of the visits flagged on September 1 had paid within three and a half weeks, which is why we treat recovery figures as a ceiling.
- 370The behavioral Medicare routing question is open345 unpaid, 25 below floor; the fix sits in enrollment and claim setup and has not yet been measured in remits.
- 13 moThis page is diagnosticIt reports what thirteen months of remits showed, not cash recovered.
Frequently asked questions
Why is same-day E/M plus psychotherapy paid as one encounter at a health center?
Health center payers that pay a prospective per-visit rate pay once per qualifying encounter, on the first eligible line, and zero on the rest. In this center's remits, 287 behavioral accounts with both codes on the same day were paid one encounter or nothing, never two, so the unpaid psychotherapy line is absorbed into the encounter rather than denied.
How does Medicare treat a medical visit and a mental health visit on the same day?
Under 42 CFR 405.2463, encounters on the same day at one location are a single visit, except when the patient has a medical visit and a mental health visit on the same day, which are separately payable. Multiple mental health encounters on one day remain one visit.
What is a county behavioral health carve-out and why does its filing clock matter?
Some states route Medicaid behavioral health through a county-run payer instead of the medical managed care plans. In this center that payer allows 90 days from the date of service to file, against 180 for the plans. A billing calendar built on 180 days left $419K of behavioral visits past deadline.
Can the $419K be recovered?
Only where the first claim went out inside the 90-day window and can be proven; those become disputes. The rest is a reserve decision for the client. Across the full review, about 5% of visits flagged on September 1 had paid within three and a half weeks, so we do not forecast recovery.
- 42 CFR 405.2463, What constitutes a visit (RHC and FQHC): medical visit, mental health visit, and the same-day rules (eCFR)
- 42 CFR 447.45, Timely claims payment: providers must submit claims within 12 months of the date of service (eCFR)
Checked October 27, 2026. Engagement figures are from ASP-RCM records and the client's own exports; the client is described by type only.
Test your behavioral visits at the encounter level
Send thirteen months of visits and remits. We measure payment per encounter against each payer's rate, age every visit against that payer's filing clock, and show what is a denial and what is not.