PR-2 Denial Code: What It Means in Medical Billing, Whether You Can Bill the Patient, and What to Do Next
PR-2 is not a denial. When PR-2 appears on your 835 Electronic Remittance Advice, the payer has processed the claim correctly and paid its contractual share. PR is the Claim Adjustment Group Code that X12 and CMS designate as Patient Responsibility. The 2 is Claim Adjustment Reason Code 2, which X12 officially defines as “Coinsurance […]
PR-242 Denial Code: Official Description, Causes, and Step-by-Step Resolution
The PR-242 denial code appears on your 835 Electronic Remittance Advice as a pairing of two separate code components. PR is the Claim Adjustment Group Code, which X12 designates as Patient Responsibility. The number 242 is the Claim Adjustment Reason Code (CARC), which X12 officially defines as “Services not provided by network/primary care providers.” CARC […]
CO-256 Denial Code: Official Description, Causes, and How to Resolve It
The co 256 denial code appears on your 835 Electronic Remittance Advice and Explanation of Benefits as a pairing of two separate code components. CO is the Claim Adjustment Group Code, which X12 defines as Contractual Obligation. The number 256 is the Claim Adjustment Reason Code (CARC), officially defined by X12 as “Service not payable […]
PR-1 Denial Code: Description, Causes, and How to Collect From the Patient
The PR-1 denial code appears on your 835 Electronic Remittance Advice (ERA) and Explanation of Benefits (EOB) as a two-part code. PR stands for Patient Responsibility, which is the Claim Adjustment Group Code. The number 1 is the Claim Adjustment Reason Code (CARC), officially defined by X12 as “Deductible Amount,” making the pr 1 denial […]
CO-18 Denial Code: Official Description, Causes, and Step-by-Step Resolution
The CO-18 denial code appears on your 835 Electronic Remittance Advice and Explanation of Benefits as a pairing of two code components. CO is the Claim Adjustment Group Code, which assigns financial obligation to the provider. The number 18 is the Claim Adjustment Reason Code (CARC), officially defined by X12 as “Exact duplicate claim/service.” X12 […]
CO-204 Denial Code: Description, Causes, and How to Fix It
The CO-204 denial code appears on your 835 Electronic Remittance Advice (ERA) or Explanation of Benefits (EOB) when a payer determines that the billed service, equipment, or drug isn’t covered under the patient’s current benefit plan. The official X12 definition of CARC 204 is: “This service/equipment/drug is not covered under the patient’s current benefit plan.” […]
CO-197 Denial Code: The Prior Authorization Recovery Playbook for AR Teams in 2026
What Is CO-197 Denial Code and Why It’s Costing Your Practice Revenue Right Now The co 197 denial code means the payer rejected the claim because prior authorization, precertification, or notification was not obtained before the service was rendered. Per X12, the standards body that maintains all HIPAA-mandated claim adjustment reason codes, the verbatim CARC 197 […]
CO-22 Denial Code: The RARC-Paired Operational Recovery Playbook for 2026
Medical practices lose serious revenue every month to CO-22 denials. Per the CMS National Claims Denial Report, CO-22 represents 12.4% of refused outpatient claims in 2026, placing it firmly in the top five denial codes by frequency. The damage isn’t just delayed payment. It’s compounded by rework cost, A/R aging creep, patient billing risk, and […]
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. […]