Blog - Nexus IO

Best Pediatric Billing Companies in the USA (2026)

Pediatric billing fails in ways that are not immediately apparent. For example, a VFC inventory report that does not reconcile with submitted claims.

Denial Code 119 Description, Reasons & Resolution Guide

Few denials feel as abrupt as Denial Code 119. One day the claims are paying cleanly, and the next day the same patient's therapy sessions, chiropractic visits,

Modifier 50 Description, Examples, and Usage Guidelines

If you spend any time around surgical claims, you've run into Modifier 50. It looks simple on the surface ,two digits appended to a CPT code

CO 167 Denial Code: Description, Reasons & Resolution Guide

If a claim comes back from the payer marked CO 167, the message is blunt: the diagnosis reported on the claim is not covered under the patient's benefit plan.

CO 11 Denial Code: Description, Causes & Resolution Guide

Few denial codes create as much recurring revenue disruption as the CO 11 denial code. It surfaces across specialties, stalls reimbursement on otherwise clean claims,

CO 4 Denial Code – Causes, Resolution & Prevention Guide

The CO 4 denial code is a Claim Adjustment Reason Code (CARC) that is defined under the ASC X12 standard.

Denial Code 27 – Description, Reasons & Resolution Steps

Your staff at the front desk managed to verify the patient’s insurance. You submitted the claim with no issues. Then the EOB came back with a denial code 27.

Ultimate Guide to CPT Code 91010

That complexity is exactly why the billing team at Nexus io created this guide to break down one of the most commonly billed yet frequently denied gastroenterology procedure codes.

197 Denial Code: Description, Reasons & Resolution Guide

Denial code 197 is a standardized Claim Adjustment Reason Code (CARC) maintained by the Washington Publishing Company (WPC), the official body managing HIPAA-mandated code sets used in U.S.