CO-95: Plan rules not properly followed

The payer is telling you that their administrative rules were not followed for the claim or service. Think of things like required notifications, referrals, specific vendors, or plan routing rules that sit outside the usual coding and auth checks. Mechanically, the payer hits CO-95 when an internal plan rule flag fails, often from eligibility, utilization management, or network configuration systems, not just the claim scrubber. The denied or reduced amount is treated as a contractual adjustment, which means you normally cannot bill the patient unless you overturn the decision on reconsideration or appeal.

In behavioral health, CO-95 often shows when the plan has extra rules around certain levels of care, and the clinic did not follow their playbook. Example: a commercial plan that requires all residential SUD admissions to be routed through a specific behavioral carve out, but the claim is sent to the medical plan, which then returns CO-95 when it sees services that should have gone through the behavioral administrator. You also see this when payers require ongoing concurrent review at set intervals and use administrative rules to cut days. For instance, PHP or IOP beyond day 10 is only payable if the utilization team receives a clinical update; if the update does not hit their system, later days may deny with CO-95 for "plan procedures not followed" even though the codes and auth number look fine. Telehealth adds another layer. Some payers require enrollment in a telehealth program before billing 95 or 93, or they require submission through a specific telehealth vendor. If a behavioral provider starts billing 90834-95 or 90853-95 without that enrollment or vendor routing in place, the payer may push back with CO-95, because their internal telehealth procedures were not followed.

• Check the remit and any RARC codes or payer portal notes to see which exact plan procedure was missed.
• Confirm eligibility and benefit details for the date of service and review plan-specific behavioral rules, including carve outs, required vendors, and notification rules.
• If the issue is routing or administrator (for example claim went to medical instead of the behavioral carve out), correct the payer information and resubmit as a new claim, not as an appeal.
• If the issue is failure to follow a notification or concurrent review rule but you actually complied, gather call logs, fax confirmations, portal screenshots, and UM notes to show proof.
• Submit a written reconsideration or appeal with that proof, clearly stating that plan procedures were followed and requesting reprocessing without the CO-95 adjustment.
• If the plan procedures truly were not followed and there is no exception policy, classify the CO-95 amount as a permanent contractual write off and update your internal process so it does not repeat.

• During intake and verification, document any special behavioral rules for that payer such as carve outs, required UM contacts, telehealth program enrollment, or OTP billing vendors.
• Build payer-specific claim edits that flag when behavioral services are being routed to the wrong administrator or missing known required indicators like telehealth modifiers.
• Standardize concurrent review schedules by payer and level of care so UM staff never miss required update dates that can trigger CO-95.
• Review CO-95 denials in a monthly pattern report to spot new payer procedures early and train front-end and UM staff on the updated rules.