Top 10 Denial Codes in Medical Billing: The 2026 Complete Resolution Guide
Medical claim denials cost US hospitals approximately $262 billion every year, per Modern Healthcare reporting. The damage doesn’t stop at hospitals. Across physician practices, ambulatory centers, and specialty groups, denied claims are quietly draining revenue, slowing cash flow, and increasing administrative workload across every level of the revenue cycle. Understanding the top 10 denial codes in […]
OA-23 Denial Code: 2026 Resolution Guide for Coordination of Benefits Denials
Your secondary claim came back with a $0 payment. The remittance shows OA-23, and the claim adjustment dollars don’t match what your auto-posting logic expected. Now your team’s stuck deciding whether to bill the patient, write it off, or appeal. The oa 23 denial code isn’t a true denial. It’s a coordination of benefits adjustment. […]
PR-96 Denial Code: 2026 Patient-Billing Compliance & Resolution Guide
A patient calls the practice complaining about a bill they didn’t expect. The PR-96 denial showed up on the remittance, the front desk billed the balance, and now the patient’s threatening to file a complaint. The PR group code said patient responsibility , so why is this a problem? The pr 96 denial code shifts […]
CO-11 Denial Code: 2026 Diagnosis-Procedure Mismatch Resolution Guide
A claim goes out clean. The coder picked the diagnosis straight from the operative note. The CPT matches the procedure performed. Two days later, the ERA comes back with CO-11. The coder’s confused. What mismatched? The co-11 denial code means the payer’s adjudication system couldn’t reconcile the submitted ICD-10 diagnosis with the billed CPT or […]
PR-204 Denial Code: What It Means, Who Pays, and How to Fix It in 2026
The biller pulls the EOB. PR-204 sits in the adjustment column. The patient gets the bill. Three months later, a complaint shows up: sometimes from the patient, sometimes from the payer, sometimes from compliance. That complaint was preventable. Most practices misread the PR-204 denial code. The PR group code does not automatically authorize patient billing. […]
OA-18 Denial Code: 2026 Exact Duplicate Claim Resolution Guide
A claim goes out clean. The biller can see in the practice management system that it was only submitted once. The clearinghouse confirmed acceptance. Two days later, the ERA comes back with OA-18: exact duplicate claim/service. The biller’s question is the obvious one: duplicate of what? The oa-18 denial code is the combination of Group […]
