Medical Billing Blog: Tips and Industry Updates

Our medical billing blog shares practical tips, coding changes and industry updates to help your practice get paid faster.

Written by our billing and credentialing team. Browse articles on denial management, A/R management, medical coding and credentialing.

CO 45 denial code explained: charge exceeds fee schedule or contracted rate
Insurance Claims and Reimbursement • Oct 2026

What the CO 45 Denial Code Means and How to Handle It

The CO 45 denial code means the charge you billed was higher than the payer’s fee schedule, maximum…

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CO 22 means the payer believes another plan should pay first, so the fix starts with billing order.
Insurance Claims and Reimbursement • Oct 2026

What the CO 22 Denial Code Means and How to Resolve It

The CO 22 denial code means the payer believes another insurance plan should pay this claim first. It…

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