Medical Accounts Receivable Follow-Up

Accounts receivable follow-up is the routine of working every unpaid balance your practice is owed until it is paid, corrected, appealed, transferred to the patient, or properly written off. It covers submitted claims waiting on a payer and patient balances waiting on the patient, and it runs on a schedule, not on memory.

Where AR follow-up sits in the revenue cycle

A claim does not end when it leaves your office. It ends when the money lands or when someone makes a documented decision to close it. Everything between those two points is AR follow-up.

The cycle runs in this order: scheduling and eligibility verification, coding and charge entry, claim submission, payer adjudication, payment posting, then follow-up on whatever is still open. Follow-up is where submitted claims either turn into revenue or stall quietly for months. For the full cycle, see how medical billing works.

The work starts the moment a claim is submitted, not the moment someone notices it is old. A claim that gets its first status check at two weeks is a routine task. The same claim discovered at ninety days is a rescue job, and sometimes it is too late to rescue at all, because the filing or appeal window has already closed.

That is the whole case for follow-up as a routine. It is a standing appointment with your own aging report, and the work is checking, fixing, and closing on a schedule.

Insurance AR vs patient AR

Open receivables are two different lists with different rules, and mixing them on one worklist is a common reason follow-up stalls. A payer balance is a claim waiting on an insurer, so the clocks that matter are filing limits, appeal windows, and contract terms. A patient balance is an amount owed after insurance has had its say, so the clocks are your statement cycle and your written financial policy.

Keep the two lists separate. They need different skills, different phone calls, and different patience. A biller who is good at payer portals is not automatically good at patient conversations, and the reverse is true too.

The AR aging buckets, and what to do in each

An aging report groups unpaid balances by how long they have been outstanding. The buckets are simple. The work in each one is different, and the oldest claims deserve attention first, because they have the least time left.

Age the buckets from the date of service, not from the date the claim was submitted, so a claim that sat unsubmitted for three weeks does not look fresh. And work oldest first. A short list worked oldest to newest beats a long list worked in the order it happens to appear.

The deadline that quietly kills old claims is timely filing. Medicare fee-for-service claims generally must be filed within one calendar year of the date of service, with limited exceptions under 42 CFR 424.44, and commercial payers set their own limits in your contracts. A claim that misses its filing window is not a slow claim. It is a dead one. For the full picture on filing limits, see timely filing limits in medical billing.

A weekly AR follow-up routine

A short, repeatable routine works better than an occasional cleanup. This one fits into a few focused hours each week, and it is the same shape whether one person runs it or a team does.

1. Run the aging report. Pull unpaid insurance claims by payer and by bucket. Keep patient balances on a separate report.
2. Sort oldest first. Start with 90+ days, then 61 to 90, then 31 to 60. The 0 to 30 bucket mostly needs a quick acceptance check.
3. Work by payer. Handling one payer at a time saves time, because the portal, the phone tree, and the requirements are the same for the whole batch.
4. Check status and act. Resubmit, send records, correct the claim, or open an appeal. Do not just note that it is still pending. A follow-up that ends with "still pending" is a follow-up that did not happen.
5. Classify every balance. Each one is never received, pended, denied, underpaid, or a patient balance. Each category has a different next step, and the classification is what turns a list into a work queue.
6. Set the next follow-up date. Every claim you touch leaves with a date for the next check. No date, no follow-up.
7. Flag patterns. If the same payer, code, or provider keeps showing up, send the pattern back to the front desk, coding, or the provider. Follow-up that never feeds back into front-end work keeps producing the same aging claims.

The last step matters most. A denial that comes back every week for the same reason is usually an eligibility problem, a coding problem, or a credentialing problem, and follow-up alone cannot fix the cause. For the denial side of the work, see claim denials in medical billing and common claim denial codes.

What to document on every follow-up

Good notes make follow-up faster, because a second call becomes a short call. Whoever picks up the claim next, including you in three weeks, should not have to start over. Record these items each time:

• Date and method of contact (portal, phone, or fax)
• Name of the payer representative, if you spoke with one
• Call or reference number
• The exact claim status the payer gave you
• What the payer needs from you, and by when
• What you did in response
• The next follow-up date

Avoid vague notes such as "called payer, pending." They record effort but not progress. If the note does not tell the next person what to do, it has not done its job.

Catching underpayments

Not every open balance is unpaid. Some are underpaid, and underpayments are easy to miss, because the claim looks closed. The payer sent money, the payment posted, and nobody checked whether the amount matched the contract.

The check is simple. Compare what the payer actually paid against the contracted rate or fee schedule for that service. When the payment is short, the next step is a reprocessing request or a provider dispute, filed inside the payer's allowed timeline. The timeline is the part people miss. Dispute windows close just like appeal windows do, so an underpayment found six months late may be unfixable even when the math is clearly on your side.

Build the check into payment posting, not into a separate project. The person posting the remittance advice is the person best placed to spot a short payment while the details are in front of them. For how to read the payer side of a payment, see remittance advice in medical billing.

When to escalate, appeal, transfer, or write off

Not every old claim is worth the same effort. A simple decision rule keeps the team from spending hours on low-value balances or giving up on claims the payer denied in error.

Correct and resubmit when the denial came from a fixable error, such as a wrong code, a missing modifier, or incorrect patient data.

Appeal when the service was covered, the documentation supports it, and the denial reason is disputed. Medicare's first level of appeal, a redetermination, must generally be requested within 120 days of receiving the initial determination, and commercial payers set their own windows, so check the clock before you decide.

Escalate when a payer repeatedly gives conflicting answers, a large balance is at risk, or a filing deadline is close. Escalation means a supervisor, a provider-relations contact, or a formal written status request, not a louder version of the same phone call.

Transfer the balance to patient responsibility only after the payer has processed the claim and the balance is truly the patient's. Never bill the patient for an amount the payer still owes, and never send a statement before secondary insurance has been billed. For the patient side of this, see patient statements in medical billing.

Write off when the claim cannot be corrected, appeal rights have expired, or the cost of continued work exceeds the balance. Document the reason and get approval according to your practice policy. A write-off is a decision, and it needs a reason code, an approver, and a date.

If the same denial reasons keep coming back, follow-up alone will not solve it. That is a prevention problem, and prevention lives upstream, in eligibility checks, authorization, and coding.

Moving an account to patient collections

Patient balances follow a different path from payer balances, and the end of that path is a decision the practice should make deliberately, not by default.

The usual sequence is statements first, then a phone call, then a payment plan offer, then a final notice. A patient who is offered a payment plan and a clear way to pay is a patient who often pays. A patient who only ever receives the same page four times has already shown that a repeat will not move them.

Before an account goes to an outside collector, check three things. First, the balance is final: the payer has processed the claim, secondary insurance has been billed, and the statement matches the explanation of benefits. Second, the account is not in a dispute, on a payment plan, or waiting on an appeal. Third, the practice knows the rules that apply. Third-party collectors are governed by the Fair Debt Collection Practices Act, and state rules add their own requirements, so the choice of agency and the timing of the referral deserve a real decision, not a batch export.

One guardrail worth holding: for self-pay patients, check the balance against the good faith estimate before the account moves anywhere. Under the federal patient-provider dispute process (45 CFR 149.620, per CMS), a self-pay patient billed at least $400 more than the estimate can start a dispute within 120 calendar days of receiving the initial bill, and while a dispute is open the bill should not go to collections and no late fees should be charged on the unpaid amount. A self-pay balance that skips the estimate check is a risk the practice does not need.

The metrics that tell you whether follow-up is working

Follow-up produces numbers, and five of them are worth watching. Read them as trends over weeks and months, not as single readings, and judge them against your own specialty and payer mix rather than a universal target.

Days in accounts receivable. Total AR divided by average daily charges. It tells you how many days of revenue are sitting uncollected at any moment. The American Academy of Family Physicians advises keeping this number below 50 days at a minimum, with 30 to 40 days preferable. The Healthcare Financial Management Association's MAP Keys give the standard definitions for the calculation, so use those if you want your number to mean the same thing as someone else's.

Percentage of AR over 90 and 120 days. The share of total receivables sitting in the oldest buckets. Older guidance based on MGMA data suggests better-performing practices keep no more than about 10 percent of AR over 120 days. A good overall days-in-AR number can hide a growing pile of old balances, so track the old buckets separately.

Denial rate. The share of submitted claims that come back denied. A climbing denial rate is usually the earliest signal that denials, not just slow payers, are feeding the AR backlog.

Net collection rate. How much of the total contractually allowed revenue the practice actually collects, distinct from gross collections against billed charges. This is the clearest measure of whether follow-up is converting contractually owed revenue into actual payments, rather than just closing out old balances.

First-pass claim acceptance rate. The share of claims accepted by the payer on first submission, without correction and resubmission. A low first-pass rate usually points back to upstream submission problems rather than follow-up itself.

One caution on all of these. The billing blogs are full of benchmark numbers for days in AR and collection rates, most of them unattributed. Treat any number without a named source as marketing, including the ones in this post's competitors. The AAFP and MGMA figures above are the ones with a source attached. Your own trend line matters more than anyone else's target.

Keeping AR follow-up in-house or getting help

Many small practices can run this routine themselves if one person has the time, the payer knowledge, and clear ownership. Trouble starts when follow-up is squeezed between check-in, phone calls, and patient questions. Then the aging report only gets attention when cash flow tightens, which is exactly when the oldest claims are already past saving.

These are the signs that outside support may help:

• Claims over 60 days are growing from month to month
• No one can say who owns each unpaid claim
• Follow-up notes are missing or inconsistent
• The same payers and denial reasons keep repeating
• Staff turnover has left gaps in payer knowledge

If that sounds familiar, the question is not whether follow-up matters. It is who has the hours to do it every week, on schedule, with notes. Our revenue cycle outsourcing services cover what an outside team takes over, and our methodology explains how we evaluate the firms that do it.

The rule to remember

AR follow-up is a weekly appointment with your own aging report, worked oldest first, with every balance leaving with an owner, a next action, and a date. Claims do not resolve themselves, and the ones nobody touches are the ones that quietly stop being collectible.