Coverage denial: what it is and how to appeal it

Not every coverage refusal is justified. That distinction is the starting point for understanding the coverage denial, one of the frequent types in hospital billing and, at the same time, one of the most disputable.

When the payer refuses payment claiming that an item is not covered, the hospital needs to know what it is facing: a justified denial, which reflects an existing contractual limitation, or an improper denial, which refuses coverage for something the contract or the law guarantees. That distinction determines whether it is worth appealing and how.

This article explains what a coverage denial is, shows the most common examples and presents a practical path for structuring the appeal.

What a coverage denial is

It occurs when the payer refuses to pay for an item on the hospital claim, claiming it is not covered by the patient’s plan. The item may be a procedure, a medication, a material, a daily rate or any other component of the claim.

This denial reaches the hospital through the payer’s notification, via a denial report, an online portal or an XML file in the TISS standard, with the code that identifies the reason for the refusal. It is up to billing to interpret that code, check whether the refusal has grounds and decide whether to file an appeal.

This denial falls into two distinct scenarios.

In the first, the denial is justified: the item billed really is not part of the coverage the patient contracted. It may be a procedure from a segment the plan does not include, a material not provided for in the contract or an item that would require a plan with broader coverage. In these cases, an appeal has a low probability of reversal.

In the second, the denial is improper: the payer refuses coverage for an item that the contract covers, that appears on the List of Health Procedures and Events of the ANS (Brazil’s National Supplementary Health Agency), or that the law guarantees regardless of the contract, such as urgent and emergency care. These cases have strong grounds for appeal and represent recoverable revenue for the hospital.

Identifying which scenario the denial falls into is the billing specialist’s first task before taking any action.

Coverage denials and other types of denial

Before appealing, the denial has to be classified correctly. An appeal aimed at the wrong type of denial uses up the deadline and does not solve the problem. The table below summarizes the differences between the three main types:

The coverage denial differs from the others because appealing it depends on contractual and legal grounds, not on correcting data. While an administrative denial is resolved by resubmitting a document, an improper coverage denial requires showing that the item was guaranteed by the contract or by law.

Main examples of coverage denials

The examples below cover the most recurrent situations in hospital billing. For each one, the indication of how disputable it is guides the team on where to focus its efforts.

1. Procedure not listed in the patient’s contract

The patient has a plan with limited coverage that does not include a given procedure performed during the hospital stay. The payer denies it, citing lack of contractual coverage. If the procedure really is not in the contract and is not on the mandatory ANS coverage list, the denial is justified. Low disputability.

2. Material or OPME not covered by the contracted plan

The payer refuses to pay for a material or OPME (implants and special materials), claiming it is not provided for in that plan member’s contract. Before accepting, check whether the item is on the ANS coverage list or whether there is a contractual provision the payer is disregarding. Variable disputability, depending on the contract and the coverage list.

3. Coverage refused due to incorrect plan segmentation

The patient’s plan was registered with the wrong segmentation at admission (outpatient instead of inpatient, for example) and the payer denies procedures that would be covered under the correct segmentation. This error originates in the hospital’s admission process. The solution involves correcting the registration and resubmitting the claim. High disputability, as long as the correct segmentation is proven.

4. Procedure refused for not being on the ANS coverage list

The payer claims the procedure is not listed in the List of Health Procedures and Events, established by ANS Normative Resolution No. 465/2021. Note: Law No. 14,454/2022 states that procedures outside the list may be covered when there is a medical prescription and support from scientific evidence or a consensus of medical societies. High disputability when there is a medical prescription and documented scientific support.

5. Coverage refused in urgent and emergency care

The payer refuses coverage, claiming the procedure was not authorized in advance or that the plan does not cover that specialty. Law No. 9,656/1998 guarantees immediate coverage in life-threatening situations, regardless of prior authorization or plan segmentation. It is one of the coverage denials with the highest probability of reversal. See the rules on urgent and emergency surcharges to understand the limits of coverage in this context. Very high disputability.

6. Item billed above the quantity limit set in the contract

The hospital bills a number of sessions, tests or materials above the limit set in the contract with that payer. The payer denies the excess as incompatible with the contracted coverage. If the limit is clear in the contract, the denial is justified for the excess. If there is documented clinical justification for the extra volume, an appeal is worthwhile. Variable disputability.

When a coverage denial can be appealed

Not every coverage denial deserves an appeal. The criterion is straightforward: are there contractual, legal or technical grounds to argue that the item was owed? If so, it is worth appealing.

Three situations hold the greatest potential for reversal.

The item is covered by the contract

The payer refuses coverage, but the contract signed with it expressly provides for that procedure, material or service. The appeal points to the clause in the contract, shows that the item was performed under the conditions provided for and demands payment. It is the most direct and objective appeal.

The procedure is on the ANS coverage list

The List of Health Procedures and Events, established by Normative Resolution No. 465/2021, sets the minimum mandatory coverage for all plans contracted since 1999. If the procedure is on the list and the patient’s plan falls under this rule, the payer’s refusal has no regulatory basis.

The care was urgent or emergency care

Law No. 9,656/1998 guarantees immediate coverage in life-threatening situations, regardless of prior authorization, plan segmentation or waiting period. Any denial that refuses coverage on these grounds in proven urgent or emergency care can be appealed with a high probability of reversal.

How to structure the appeal

A well-built coverage denial appeal follows five steps.

1. Identify the denial’s TISS code

The payer’s notification includes the code that indicates the reason for the refusal. That code is the starting point: it reveals whether the refusal is due to lack of contractual coverage, an item outside the coverage list or another coverage-related reason. Check the denial code table to interpret each code correctly before acting.

2. Check the contract and the ANS coverage list

With the code in hand, cross-check the denied item against the current contract with that payer and the updated ANS coverage list. If the item appears in either, there are grounds to appeal. If it appears in neither, assess whether there is support under Law 14,454/2022 before proceeding.

3. Gather the supporting documentation

The quality of the documentation is the main success factor in an appeal. For coverage denials, the essential documents are: the contract with the payer, the TISS form for the care provided, the medical record with progress notes and prescriptions, the report that justifies the procedure and, where applicable, references to clinical guidelines or scientific publications that support the need for the item.

4. Write the appeal with technical and legal grounds

The appeal needs to be objective: identify the denied item, present the grounds that guarantee its coverage, cite the applicable contract, regulation or law and attach the supporting documents. Generic appeals have a low reversal rate.

5. Meet the contractual deadline

Each contract sets a deadline for filing a denial appeal. Missing that deadline makes the appeal impossible regardless of the quality of the argument. The billing team needs to track each payer’s deadlines systematically.

An improper coverage denial is recoverable revenue

A legitimate coverage denial is something the hospital learns to avoid. An improper coverage denial is something the hospital needs to appeal. The difference between the two defines how much revenue is withheld unnecessarily.

Identifying the code, cross-checking it against the contract and the coverage list, gathering documentation and writing the appeal within the deadline requires a cadence that overloaded teams rarely sustain.

Rivio automatically identifies improper coverage denials, checks the contractual and legal grounds for each item and structures the appeal with the necessary documentation, before the deadline runs out. The result is less withheld revenue and more predictability in the hospital revenue cycle.

Frequently asked questions about coverage denials

What is a coverage denial?

It is the payer’s refusal to pay, claiming that the item billed is not covered by the patient’s plan. It may be justified, when the item really is not covered, or improper, when the payer refuses something guaranteed by the contract, by the ANS coverage list or by law.

Can every coverage denial be appealed?

No. Justified denials, in which the item really is outside the contract and has no legal support, have a low probability of reversal. It is worth focusing efforts on improper denials: items covered by the contract, procedures listed on the ANS coverage list or urgent and emergency care refused without valid justification.

What should you do when the payer claims the procedure is not on the ANS coverage list?

Check whether the procedure is supported by scientific evidence or a consensus of recognized medical societies. Law No. 14,454/2022 states that procedures outside the list may be covered when there is a medical prescription and documented technical and scientific support. If that support exists, the appeal has legal grounds to dispute the refusal.

What is the deadline for appealing a coverage denial?

The deadline is set by the contract signed with each payer and varies between them. There is no single deadline set by the ANS for all cases. That is why the billing team needs to track each payer’s deadlines systematically. Missing the deadline makes the appeal impossible regardless of the quality of the argument.

What documents are needed for a coverage denial appeal?

The essential documents are: the contract with the payer, the TISS form for the care provided, the medical record with progress notes and prescriptions, the report that justifies the procedure and, where applicable, references to clinical guidelines or scientific publications.