Category: Blog

CO-109 Denial Code: Description, Causes, and How to Fix It

According to X12, the official body that maintains Claim Adjustment Reason Codes, CARC 109 is defined as: “Claim/service not covered by this payer/contractor. You must send the claim/service to the correct payer/contractor.” In plain terms, the co 109 denial code means the claim you submitted landed at a payer that has no financial responsibility for […]

CO-151 Denial Code: Complete Description, Causes, and Resolution Guide [2026]

The official Claim Adjustment Reason Code (CARC) 151 definition, per X12, reads: “Payment adjusted because the payer deems the information submitted does not support this many/frequency of services.” That’s the technical version. Here’s what it means in practice: you billed a service more times than your documentation can justify, and the payer cut the payment. […]

CO-96 Denial Code: What It Means, Who Pays, and How to Fix It

Every month, practices across the country write off revenue they didn’t have to lose. The CO-96 denial code is sitting behind a significant portion of that number. Initial denial rates hit 11.8% in 2024, up 2.55% year-over-year, and according to a 2025 MDaudit report, the average medical necessity denial now costs $450 per claim, a […]

CO-29 Denial Code: What It Means, Why It Happens, and How to Fix It

CO-29 denial code means one thing: the claim arrived after the payer’s deadline. Not a coding error. Not a credentialing issue. A timing problem. And timing problems in billing often mean unrecoverable revenue. That’s what makes this denial different from almost everything else in your AR. Late filing denials don’t work like other denials. You […]

POS 22 in Medical Billing: The 2026 Payer-Specific Compliance Playbook for Healthcare Providers

Introduction POS 22 in medical billing is the official CMS designation for On Campus-Outpatient Hospital: a hospital-owned outpatient department on the main campus where patients receive care without formal admission. It goes in Item 24B of the CMS-1500. Most billing guides stop there. The real issue is what happens after you write it. This single […]

CO-50 Denial Code: What It Means, Why It Happens, and How to Fix It

You pulled a CO 50 denial code off your remittance, and now you’re trying to figure out what went wrong and whether you can recover the money. Here’s the thing: this denial has a very specific financial consequence that most billing staff don’t catch until it’s too late. CO-50 is the sixth most common reason […]

PR-27 Denial Code: Official Definition, CO-27 Difference, 7-Step Resolution and 2026 CMS Updates

According to MGMA data, reworking a single denied claim costs between $25 and $118 in staff time alone. Multiply that across even 50 denied claims in a month and you’re looking at $1,250 to $5,900 in pure administrative overhead, before accounting for delayed cash flow or balances that never get collected at all. The pr-27 […]

CO-16 Denial Code: Official Definition, Causes, Remark Codes and Step-by-Step Resolution [2026]

What Is the CO-16 Denial Code — Official X12 Definition Official Definition — CARC 16 (X12, Last Reviewed March 1, 2026): “Claim/service lacks information or has submission/billing error(s) which is needed for adjudication.” X12 Usage Rules: The CO-16 denial code is CARC number 16 on the official X12 Claim Adjustment Reason Code list, which is […]

CPT Code 99202: Payer-Specific Rules, Compliance Pitfalls and Clean Claim Playbook [2026]

The CMS Comprehensive Error Rate Testing (CERT) program flags evaluation and management codes as the largest source of Medicare improper payments, year after year. CPT code 99202 is an evaluation and management code used for new patient office or other outpatient visits that require straightforward medical decision making or 15 to 29 minutes of total […]

Insurance Eligibility Verification and Prior Authorization: The Complete Guide for Healthcare Providers [2026]

A patient walks in. Your team provides the service. The claim goes out. Then it bounces back, denied. Not for a coding error. Not for missing documentation. The patient’s insurance had lapsed three days before the appointment, and nobody caught it. Or the procedure needed prior authorization that was never requested. Either way, that revenue […]