A medical claim is submitted, the patient receives the care, and your practice does everything it is supposed to do. Then you wait for the payment.

And you keep waiting.

The claim may still be sitting with the insurance payer. It may have been rejected because of a small error, denied for a specific reason, or delayed because the payer needs more information. Meanwhile, the balance remains in your accounts receivable, and your practice is still waiting to get paid.

This is why medical claim follow-up is such an important part of the revenue cycle.

Following up on unpaid claims isn’t simply about calling an insurance company and asking for an update. You need to understand where the claim is, why it hasn’t been paid, what needs to be done, and when the claim should be followed up again.

When your team follows a consistent process, it becomes easier to recover outstanding payments, control aging AR, and avoid letting legitimate revenue slip through the cracks.

In this guide, we’ll explain how to follow up on unpaid medical claims, how to handle common claim problems, and what practices can do to make the process more efficient.

Why Do Medical Claims Remain Unpaid?

Before you can recover an unpaid claim, you need to understand what caused the delay.

Not every unpaid claim has a problem with the claim itself. Sometimes the payer simply hasn’t finished processing it. In other cases, something needs to be corrected, or additional information may be required.

Common reasons include:

• Incorrect patient or insurance information
• Inactive insurance coverage
• Missing prior authorization
• Incorrect or incomplete claim information
• Coding or documentation issues
• Claim rejection
• Claim denial
• Coordination of benefits problems
• Payer processing delays
• Missing supporting documentation

The important thing is to identify the actual reason instead of treating every unpaid claim the same way.

For example, a pending claim may simply need monitoring, while a denied claim may require a detailed review and an appeal.

The right follow-up starts with knowing what happened to the claim.

How to Follow Up on Unpaid Medical Claims

Confirm That the Claim Was Submitted

Before contacting the insurance payer, make sure the claim was actually submitted.

This may sound obvious, but it can save your billing team a surprising amount of time.

Check your practice management system or clearinghouse for the:

• Submission date
• Claim status
• Payer
• Claim number
• Acceptance information
• Rejection messages

If the claim was rejected by the clearinghouse, the insurance company may never have received it.

In that situation, the next step isn’t necessarily to call the payer. First, find out why the claim was rejected, correct the problem, and resubmit it when appropriate.

Find Out Where the Claim Stands

Once you’ve confirmed that the claim was submitted successfully, check its current status.

You may find that the claim is:

Pending: The payer received the claim but is still processing it.

Rejected: The claim was not accepted for processing and may need correction.

Denied: The payer processed the claim but did not approve payment.

Paid: The payer issued payment, but the practice may not have received or posted it yet.

Not Found: The payer cannot locate the claim in its system.

These statuses matter because each one requires a different response.

You don’t want to appeal a claim that is still being processed. At the same time, you don’t want to keep waiting on a claim that has already been denied.

Check the Payer’s Processing Time

Not every unpaid claim is overdue.

Insurance companies have different processing timelines, so check when the claim was submitted and whether it has passed the payer’s expected processing period.

Before contacting the payer, ask:

• When was the claim submitted?
• When was it accepted?
• Has the normal processing period passed?
• Has the payer requested additional information?
• Has there been any previous communication about the claim?

If the claim is still within the expected processing period, it may simply need to be monitored.

If it has gone beyond that period, it’s time to investigate.

Review the Claim Before Making the Call

Don’t go into a payer call without knowing the details of the claim.

Review the information you have and make sure it matches the patient’s insurance records.

Pay attention to:

• Patient name
• Date of birth
• Member ID
• Group number
• Date of service
• Provider information
• NPI
• Billed amount
• Claim number

This review can help you identify potential problems before the payer does.

It also means you’re better prepared to answer the representative’s questions.

Contact the Insurance Payer

If the claim is overdue or the status isn’t clear, contact the payer.

Have all relevant claim information ready before making the call. The more prepared you are, the less likely you’ll have to repeat the process later.

Instead of asking only:

“Why hasn’t this claim been paid?”

ask questions that give you useful information:

• Can you confirm that the claim was received?
• What is the current status?
• Is anything missing?
• Is the claim being held for additional information?
• Was the claim denied or rejected?
• What action is required from the provider?
• Has a payment been issued?
• When should we follow up again?

The purpose of the call is not just to get an answer.

You want to leave the call knowing what happens next.

Document the Conversation

A phone call is only useful if your team knows what happened afterward.

Record the important details immediately after the conversation.

This can include:

• Date of contact
• Payer name
• Representative name or ID, when available
• Claim status
• Reference number
• Reason for the delay
• Information requested
• Action taken
• Next follow-up date

Good documentation prevents your team from repeating the same work.

If another billing specialist picks up the claim later, they should be able to understand its history without making another unnecessary call.

What Should You Do When a Claim Is Denied?

A denial doesn’t necessarily mean the money is lost.

The first thing to do is understand why the payer denied the claim.

Review the denial reason carefully.

Was the patient ineligible?

Was authorization missing?

Was information incorrect?

Was documentation required?

Was the service not covered?

Was there a coding issue?

Once you understand the reason, determine the appropriate next step.

Depending on the circumstances, the claim may need to be corrected, resubmitted, reconsidered, or appealed.

The mistake to avoid is sending the same claim back without addressing the actual reason for the denial.

Fix the problem first. Then take the appropriate recovery action.

What If the Payer Says It Never Received the Claim?

This is another common situation.

Your system may show that the claim was submitted, but the insurance company says there is no record of it.

Before resubmitting immediately, check your submission and acceptance records.

Look for:

• Original submission date
• Clearinghouse acceptance
• Claim transmission details
• Any rejection messages
• Previous payer communication

If the claim wasn’t received, determine why and resubmit it per the payer’s requirements.

If you have evidence that the claim was successfully submitted or accepted, keep those records available when speaking with the payer.

Documentation can make a big difference when resolving these situations.

Don’t Let Aging Claims Get Forgotten

One of the biggest problems with unpaid claims is that they can sit quietly in AR.

A claim is added to a report. Someone plans to work it later. Then new claims arrive, new denials appear, and the older claim gets pushed further down the list.

Before long, a claim that could have been resolved quickly becomes an aged account.

That’s why practices should regularly review their AR and prioritize claims based on factors such as:

• Age
• Balance
• Claim status
• Payer
• Filing deadline
• Denial reason
• Recovery potential

Older claims deserve particular attention because the longer they remain unresolved, the more complicated recovery can become.

How to Prioritize Unpaid Medical Claims

If your practice has a large number of unpaid claims, don’t try to work every account in the same way.

Start with the claims that need attention most urgently.

For example, a high-value claim that is approaching a payer deadline may deserve immediate attention.

A recently submitted claim that is still within the normal processing period may simply need monitoring.

A practical priority system can look at:

Claim Age

Older claims generally require more immediate review.

Outstanding Amount

Higher-value claims can have a greater impact on practice revenue.

Filing Deadlines

Claims approaching applicable deadlines should not be left unattended.

Claim Status

Denied, rejected, pending, and missing claims require different follow-up strategies.

Payer Requirements

Different payers may have different processes for corrections, appeals, and follow-up.

This type of prioritization allows your billing team to use its time more effectively.

How to Reduce Future Unpaid Claims

Claim follow-up is important, but preventing avoidable problems is even better.

If your practice keeps seeing the same type of unpaid claim, don’t just continue working the claims individually.

Look for the pattern.

Are insurance details frequently entered incorrectly?

Are certain services regularly missing authorization?

Are claims being rejected for the same reason?

Are specific payers consistently creating delays?

When you identify a pattern, you can look for a process improvement that prevents the problem from happening again.

This turns claim follow-up into more than a recovery activity.

It becomes a way to improve your entire revenue cycle.

Common Medical Claim Follow-Up Mistakes to Avoid

Even experienced billing teams can run into problems when follow-up isn’t organized.

Waiting Too Long

A claim that isn’t followed up on can become an aged claim before anyone notices.

Calling Without Reviewing the Claim

If you don’t know the claim history, you may waste time asking questions that your billing system could have answered.

Failing to Document Calls

Without notes and reference numbers, the next follow-up may start from zero.

Treating Every Claim the Same

A pending claim, rejected claim, and denied claim don’t require the same response.

Resubmitting Without Fixing the Problem

Resending the same incorrect claim rarely resolves the underlying issue.

Ignoring Filing Deadlines

A claim can become much harder to recover if applicable deadlines are missed.

Avoiding these mistakes can make your follow-up process more efficient and consistent.

When Should a Practice Consider Outsourcing Claim Follow-Up?

There comes a point when unpaid claim management can become too much for an internal billing team.

This often happens when a practice is growing, claim volume increases, or staff is already overloaded with other billing responsibilities.

You may want to consider additional billing support if:

• Your AR continues to grow
• Older claims aren’t being worked consistently
• Staff spend hours on insurance calls
• Denials are increasing
• Follow-up notes aren’t being maintained
• Claims are approaching filing deadlines
• Your team doesn’t have enough time for AR management

Outsourcing doesn’t mean giving up control of your revenue cycle.

With the right billing partner, it can mean giving your team additional support so outstanding claims receive the attention they need.

How RobustINC Can Help

Managing unpaid medical claims takes more than submitting a claim and waiting for payment.

It requires consistent follow-up, accurate documentation, denial management, AR monitoring, and a clear understanding of what needs to happen next.

That’s where RobustINC can support healthcare practices.

Our medical billing and revenue-cycle services can include claim follow-up, denial management, accounts receivable management, payment posting, and medical billing,