Best Medical Billing

Independent editorial reference

US medical billing,
explained precisely.

Payer rules, denial codes, CPT and HCPCS references, specialty workflows and state-by-state requirements — written and reviewed by certified billing professionals for practice managers, physicians and RCM teams.

1,200+
Payer & denial references
CPT / HCPCS
Code-level detail
50 states
Coverage & filing rules

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Featured

Unpacking the CO-59 Denial Code: Multiple Procedure Adjustments

Code CO-59 isn't a traditional denial—it is a contractual adjustment triggered by multiple procedure payment reduction (MPPR) rules. If you are seeing unexpected 50% pay cuts on secondary procedures, here is how to verify the math and appeal improper bundling in 2026.

10 min read

Humana Timely Filing Limits and Billing Guidelines (2026)

Missing a Humana filing deadline means an automatic CO-29 denial. Here is exactly how long you have to submit original and corrected claims to Humana in 2026, plus the clearinghouse proof you need to overturn a timely filing denial.

9 min read

Winning Your Peer-to-Peer Insurance Reviews in 2026

Stop losing revenue to poorly handled peer-to-peer reviews. This guide breaks down the exact steps, timelines, and clinical preparation required to successfully overturn prior authorization denials when your provider gets on the phone with a payer's medical director.

10 min read

Topic hubs

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