Most practices know their billing is imperfect. What they rarely know is where, exactly, the money leaks — or whether the leak is a drip or a steady flow.
A medical billing audit answers that question. It is a structured review of your billing operation, from charge entry to final payment, that compares what your practice did against what your payer contracts, documentation, and fee schedule say should have happened. The output is a findings list: specific patterns, specific claim examples, and a clear picture of what to fix first.
This guide explains what a billing audit includes, what it typically finds, and the signs that it is time to request one.
What a medical billing audit is (and is not)
A billing audit is a diagnostic, not a commitment. It examines how claims are created, submitted, paid, denied, and followed up over a recent period, and it evaluates the process as much as the individual claims.
An audit is not:
- A coding audit only (coding is one component, not the whole review)
- A compliance review of clinical documentation (related, but the focus here is revenue and process)
- A promise of recovered dollars — any audit that guarantees a recovery figure before looking at your data is guessing
A well-run audit ends with findings you can verify in your own system. If a finding cannot be pointed to in a remit, a report, or a claim history, it does not belong in the report.
What does a medical billing audit include? The six review areas
1. Charge entry and charge capture
The audit starts where claims start. Reviewers look at whether documented services are becoming charges completely and accurately: do the entered codes, units, and modifiers match the encounter documentation? Do dates of service and rendering providers line up? Are there documented visits with no charge at all?
Findings in this area usually show up as patterns — one location consistently under-entering units, one service line frequently missing a modifier — rather than isolated typos.
2. Coding accuracy
Next, the audit samples claims and checks the coding against the documentation: procedure codes that describe what was actually performed, diagnosis codes that support medical necessity, and code combinations that payers accept together. The point is not to grade coders; it is to find where coding habits and payer expectations have drifted apart.
3. Claim submission and rejection patterns
A claim that never reaches the payer cannot pay. The audit reviews rejection data to see what is stopped before adjudication — eligibility failures, missing information, invalid code combinations — and how quickly rejections are corrected and resubmitted. A rejection queue that nobody owns is a common, quiet finding.
4. Denial patterns and follow-up
Denials are sorted by root cause, not just counted. Which denial categories repeat? Which payers generate them? Are denied claims being worked within timely filing and appeal windows, or aging untouched? The audit looks for the difference between a denial that was appealed with documentation and a denial that was written off by default.
Denial patterns connect directly to follow-up workflow — see how Fastora’s revenue cycle management service ties denial work into the full cycle instead of treating it as a cleanup project.
5. Payment accuracy and underpayments
This is where a billing audit often earns its keep. Remittances are compared line by line against contracted rates: did the payer pay what the contract says for that code, that modifier, that place of service? Audits look for short-pays, wrong fee schedules applied by the payer, silent downcoding, and contractual adjustments taken incorrectly. A single underpaid line is small; the same line underpaid across a year of claims is not.
When underpayments are the main finding, the fix is a dedicated comparison process — Fastora’s underpayment recovery service is built around paid-versus-contracted review.
6. A/R aging and follow-up discipline
Finally, the audit reads your accounts receivable the way an owner should: how old is the unpaid money, where is it concentrated, and is anyone actively working it? Buckets that grow while follow-up notes stay thin tell a story no denial report can. Timely filing deadlines missed because a claim sat in a queue are findings an audit will surface plainly.
Audit findings only matter if they change what you watch every month — analytics and reporting is how that follow-up becomes routine instead of a one-time cleanup.
A medical billing audit checklist (what to expect the reviewer to request)
If you request an audit, expect to provide access or reports along these lines:
- Recent remittance data (ERAs/EOBs) for a defined period, across your main payers
- A sample of claims with their documentation, denials, and follow-up history
- Your current fee schedule and your payer contracts or contracted rate sheets
- A/R aging reports, ideally by payer and by age bucket
- Rejection and denial reports from your clearinghouse or billing system
- Your charge entry, coding, posting, and follow-up workflow as it actually runs today
A reviewer who asks for none of this is not auditing; they are estimating.
What an audit typically finds
Findings vary by practice, and an honest audit says so. The categories below are the recurring ones — listed as categories, because the specifics belong to your data:
- Charge capture gaps: documented services that were never charged, or charged with units below the documentation
- Front-end pattern errors: eligibility and authorization misses that generate predictable, repeatable denials
- Coding drift: code and modifier habits that no longer match payer policy or the documentation
- Underpayments: paid amounts below contracted rates, often concentrated in one or two payers or code families
- Denial backlog: denied claims aging without appeals, some approaching or past filing deadlines
- Fee schedule issues: charges entered below contracted amounts, capping payment before the claim is even read
Notice what is not on this list: a percentage. An audit that reports “we typically recover X% for practices like yours” is marketing, not auditing. Your findings come from your remits.
When does a practice need a billing audit?
Consider an audit when any of these are true:
- Revenue feels flat or down while visit volume is steady or growing
- Denials are being worked, but the same categories keep coming back
- Nobody at the practice can say, with data, whether payers are paying contracted rates
- A/R over 90 or 120 days keeps growing and the explanations are general
- You are changing billing staff, switching systems, or evaluating whether to outsource billing — an audit gives you the before picture
- It has been more than a year since anyone compared paid amounts to contracted rates on purpose
An audit also makes sense before signing or renewing a billing arrangement. Knowing your baseline — denial rate, days in A/R, underpayment exposure — is how you tell whether any service, in-house or outsourced, is actually improving things.
What happens after the audit
A useful audit ends with a prioritized fix list, not a binder: the findings, the claim examples behind them, and a recommended order of work — quick corrections first, then process fixes, then recovery work where underpayments are documented. The practice decides what to fix internally and what to hand off; a good audit leaves the data with you either way.
Conclusion
A medical billing audit is simply a structured look at the truth of your revenue cycle: what gets charged, what gets denied, what gets paid, and what gets quietly written off. It checks charge entry, coding, submissions, denials, payment accuracy, and A/R follow-up against your documentation and your contracts — and it tells you, with examples, where the money is leaking.
Fastora’s free billing assessment is exactly that kind of review: we examine your billing process, show you what we would fix first, and leave the decision with you. No obligation, and no invented numbers — the findings come from your own data.
Frequently asked questions
What does a medical billing audit include?
A full billing audit reviews charge entry and charge capture, coding accuracy against documentation, claim submission and rejection patterns, denial categories and follow-up, payment accuracy against contracted rates, and A/R aging and follow-up discipline. It is a process and revenue review, not just a coding check.
How much does a medical billing audit cost?
It depends on the scope and who performs it. Some billing companies include an assessment at no charge as an evaluation step; independent audits are priced by scope. Ask what data the reviewer will examine and what the written findings will include — that matters more than the quote. Fastora’s billing assessment is free.
How long does a billing audit take?
That depends on data access and the size of the sample reviewed. The honest answer is that a reviewer should give you a timeline before starting, once they see what reports and remits are available. Be cautious of instant findings based on no data.
Will an audit find money we are owed?
It may. Audits commonly surface underpayments (paid below contracted rates) and denial backlogs that were never appealed. But any specific recovery amount can only come from reviewing your remits — no one can quote a figure or percentage for your practice before looking.
What is the difference between a billing audit and a coding audit?
A coding audit examines whether codes match documentation. A billing audit includes coding as one part, but also covers charge entry, claim submission and rejections, denial follow-up, payment accuracy, and A/R management — the whole path from encounter to final payment.
1 comment