ClaimBack Blog

Expert advice on appealing denied insurance claims. Learn the strategies that work across Singapore, UK, UAE, Australia, and beyond.

February 28, 2026

What Is a Formulary (Drug List)? How Tiers Work and How to Appeal Exclusions

A formulary is your health plan's approved drug list. Learn how drug tiers work, why a drug might be excluded, and how t

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February 28, 2026

What Is a Drug Formulary? Tiers, Exceptions, and What to Do When Your Drug Isn't Covered

A drug formulary is your insurance plan's list of covered medications. Learn how tiers 1โ€“5 work, why your drug might not

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February 28, 2026

What Is a Network in Health Insurance? In-Network vs Out-of-Network Explained

Your insurance network determines which doctors and hospitals you can see at the lowest cost. Learn the difference betwe

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February 28, 2026

What Is an Allowed Amount in Health Insurance? Contracted Rates, Balance Billing, and the No Surprises Act

The allowed amount is the maximum your insurer will pay for a service. Learn how it's set, why out-of-network allowed am

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February 28, 2026

What Is an Explanation of Benefits (EOB)? A Complete Guide

An EOB is not a bill โ€” it's your insurer's report card on a claim. Learn how to read every section, decode denial codes,

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February 28, 2026

What Is Balance Billing? How to Dispute a Surprise Medical Bill

Balance billing happens when an out-of-network provider charges you the difference between their full rate and what your

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February 28, 2026

What Is Coordination of Benefits (COB)? Primary vs Secondary Insurance Explained

Coordination of benefits determines which insurer pays first when you have multiple health plans. Learn how COB works, t

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February 28, 2026

What Is ERISA and How Does It Affect Your Health Insurance Appeal Rights?

ERISA governs most employer-sponsored health plans and defines your appeal rights โ€” and your limitations. Learn what ERI

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February 28, 2026

What Is an Explanation of Benefits (EOB)? A Plain-English Guide

An Explanation of Benefits (EOB) is not a bill โ€” it's your insurer's record of how your claim was processed. Learn how t

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February 28, 2026

What Is Medical Necessity? The Legal Definition and How to Prove It in an Appeal

Medical necessity is the most common reason insurers deny claims โ€” but their definition of it is not the same as your do

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February 28, 2026

What Is Prior Authorization? How It Works and What to Do If Denied

Prior authorization is your insurer's approval process before you receive care. Learn which treatments require it, how t

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February 28, 2026

What Is Step Therapy? How Fail-First Policies Work and How to Get an Exception

Step therapy forces patients to try cheaper drugs before accessing the one their doctor prescribed. Learn how it works,

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February 28, 2026

What Is Subrogation in Health Insurance? How to Handle Your Insurer's Reimbursement Claim

Subrogation lets your health insurer seek reimbursement from your personal injury settlement. Learn when it applies, how

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February 28, 2026

What Is the ACA? Affordable Care Act Protections for Denied Claims

The Affordable Care Act created powerful consumer protections for people with denied insurance claims, including externa

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February 28, 2026

What Is Utilization Review? How Insurers Approve and Deny Care

Utilization review (UR) is the process insurers use to decide whether to cover your care before, during, and after treat

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February 28, 2026

What to Do When Insurance Denies Your Claim: Day-by-Day Action Plan

Don't accept a health insurance denial. Here's a clear action plan for what to do from Day 1 โ€” request the EOB, identify

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February 28, 2026

Which Health Insurance Company Denies the Most Claims?

Denial rate comparison using CMS and KFF data: UnitedHealthcare, Cigna, Aetna, BCBS, and Humana denial rates ranked and

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February 28, 2026

H-1B, L-1, or O-1 Visa Holder: Insurance Claim Denied? Here's What to Do

Work visa holders on H-1B, L-1, and O-1 visas face unique risks when employer-sponsored insurance claims are denied. Lea

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February 28, 2026

Xarelto Denied by Insurance? How to Appeal

Insurance denied Xarelto (rivaroxaban) for atrial fibrillation, DVT, PE, or CAD? Learn how to appeal an Xarelto prior au

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February 27, 2026

Aetna Denied Your NICU Coverage? How to Appeal โ€” ClaimBack

Aetna NICU denials are among the most frequently overturned on appeal. Your newborn has federal protections under the Ne

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