Gulf Coast Behavioral Health Billing

The Situation

Gulf Coast Behavioral Health Billing handled revenue cycle operations for 19 outpatient behavioral health practices, including individual therapy providers, group practices, and two intensive outpatient programs. Annual collections ran at $1.8M. Their Medicaid mix was 39%, which meant coordination of benefits errors and secondary payer failures were a constant source of write-offs the team had normalized as part of the business.

The owner had been running the business for nine years. She knew behavioral health billing was more denial-prone than most sub-industries. What she did not know was that $190,000 of her annual revenue loss was traceable to two specific, fixable problems: coordination of benefits errors on dual-eligible patients, and timely filing misses on a specific commercial payer that had quietly tightened its submission window from 180 days to 90 days during a contract update 14 months earlier.

That contract change had never been updated in their billing workflow. Claims that had been submitting on a 150-day cadence for years were now hitting timely filing denials at volume. Nobody had caught it because the payer had not communicated the change formally to providers and the billing team had no system to monitor payer-specific timely filing deadlines for updates.

What Was Breaking

The coordination of benefits failures were concentrated on a specific patient population: dual-eligible patients where Medicaid was being billed as primary when Medicare should have been primary. The incorrect primary payer selection was generating CO-22 denials that were being worked manually, one at a time, consuming significant staff time on claims that should never have been billed incorrectly to begin with.

The timely filing problem was producing permanent write-offs. CO-29 denials on claims past the 90-day window were unappealable. By the time Mirlo Systems ran the audit, an estimated $73,000 in claims had already been written off permanently in the prior 14 months due to the deadline change that had gone undetected.

A third compounding problem was session-level documentation gaps on a subset of therapy providers whose notes were being submitted without required diagnostic specificity for commercial payer billing. Those claims were returning CO-50 medical necessity denials that were largely unappealed because the documentation required to support an appeal did not exist in the format the payer required.

The Build

The first correction was payer order logic for dual-eligible patients. Mirlo Systems built a secondary payer identification check into the eligibility verification step, run before every claim submission, that confirmed Medicare primary status for dual-eligible patients and flagged any account where the billing sequence did not match the verified coverage order. CO-22 denials from this cause dropped to near zero within the first billing cycle after implementation.

The second correction was a timely filing deadline monitor across all active payers in their mix. Mirlo Systems built a payer deadline registry that tracked submission windows by payer, flagged any claim approaching 60% of its filing window without a confirmed submission, and sent automatic escalation alerts for claims at risk. The 90-day commercial payer window was updated in the system immediately. No further CO-29 write-offs occurred on that payer from that point forward.

The third correction addressed documentation quality at the provider level. Mirlo Systems built a pre-submission documentation completeness check for the therapy providers generating CO-50 volume. Claims from those providers were routed for a documentation review before submission if the diagnosis code specificity fell below the threshold required by the relevant commercial payers. The check created a feedback loop back to the practice that reduced documentation deficiency rates by 71% within 60 days.

A client performance report was also deployed for the owner, delivered each Monday, showing denial rate by practice, clean claim rate by provider, and AR aging status across all 19 accounts. For the first time, she had a single view of which practices were performing and which needed attention before the numbers became a problem.