A pain management billing audit finds lost revenue by checking a sample of injection and RFA claims against the codes, levels, frequency limits and documentation payers require. The gaps it uncovers become rebills, appeals and fixes that stop the same losses next month. Many of those gaps start before the procedure, which is why pain management prior authorization needs its own checks.
This guide shows where injection and RFA revenue goes missing, how to run the audit step by step and how to turn findings into recovered revenue.
Where Injection and RFA Revenue Goes Missing
Lost revenue in pain claims falls into three groups: services billed short, denials that could have been avoided and payments below contract.
Injection claims lose money when add-on levels such as 64480 or 64484 are left off, bilateral injections are billed as one side, or an epidural denies after the session limit is reached.
RFA claims lose money when the additional-level codes 64634 or 64636 are missed, when the ablation denies because block relief was not documented, or when bilateral RFA is underpaid.
Repeat denials, aging A/R and payments below contract are the signs these leaks are active. Our list of pain management billing mistakes shows how they start, and a focused pain management billing review shows how much they cost.
Choosing the Claims to Review
Start with a sample from the last six to 12 months. Pull claims for your highest-volume procedures, usually epidurals, facet blocks and RFA, and include each physician. Include paid and denied claims. Paid claims show coding risk and underpayments, while denials show where revenue is already being lost.
Ten to 20 claims per physician and procedure type is usually enough to spot patterns. If error rates are high, widen the sample before drawing conclusions. For each claim, gather the procedure note, the authorization, the claim as billed and the remittance. Having all four side by side shows whether a problem started in documentation, coding or payment.
Coding Checks on Injection and RFA Claims
A pain management coding audit compares each claim with the procedure note. The stakes are real: a federal review found that 55% of sampled facet sessions did not meet Medicare rules. These five checks catch most errors.
Joint and Level Count
Facet codes 64490–64495 are billed per joint level, not per nerve blocked. RFA codes 64633–64636 follow the same rule, so confirm the note supports each level billed.
Laterality and Bilateral Modifiers
Check that bilateral procedures carry the right modifier for the payer and setting, and that RT or LT matches the note. Bilateral errors are a common cause of overpayment findings.
Imaging Guidance
Medicare facet and epidural policies require fluoroscopic or CT guidance, already built into those codes. Make sure imaging is documented and not billed separately.
Diagnostic vs Therapeutic
The same review found 33 of 43 therapeutic facet sessions should have been billed as diagnostic. Labels matter, because they drive frequency limits.
Epidural Code Selection
Confirm the approach and region match the code, such as 62323 for lumbar interlaminar or 64483 for lumbar transforaminal. Our epidural steroid injection billing guide covers each code.
Frequency and Coverage Checks
Medicare counts sessions per spinal region over a rolling 12 months, and many commercial plans follow similar rules. The table shows the Medicare limits to test in every audit.
| Procedure | Medicare limit per region | What to check |
|---|---|---|
| Diagnostic facet block | 4 sessions in 12 months | At least 80% relief recorded |
| Therapeutic facet injection | 4 sessions in 12 months | Relief of 50%+ lasting 3+ months before repeats |
| Radiofrequency ablation | 2 sessions in 12 months | Two prior diagnostic blocks with 80%+ relief |
| Epidural steroid injection | 4 sessions in 12 months | Radicular pain and failed conservative care |
Count every session from the date of service backward, not by calendar year. Payments beyond these caps are a known OIG audit target.
Our guide to facet joint injection frequency limits explains how sessions are counted across regions and providers.
Turning Findings Into Recovered Revenue
An audit only pays off when findings turn into action. These five steps recover revenue and protect it.
Rebill Correctable Claims
Correct missing levels, modifiers or diagnoses and resubmit within the payer’s timely filing limit. Prioritize high-dollar RFA and multi-level claims first.
Appeal Underpayments
Compare each payment with your contract. Underpaid multi-level and bilateral claims are often worth an appeal, especially when the same payer error repeats.
Return Overpayments Promptly
If the audit finds overpayments, report and return them within 60 days of identifying them. Prompt refunds limit penalties and show good faith.
Fix the Source
Update templates, charge entry rules and frequency trackers so the same errors stop. Train physicians on what the note must show for each procedure.
Re-Audit in 90 Days
Review a fresh sample to confirm the fixes work, then repeat the audit at least once a year. Track the error rate by physician and procedure so progress is easy to see.
Why an Independent Pain Audit Helps
Internal reviews often miss patterns the team has grown used to. An outside reviewer brings a fresh baseline and knows how payers and auditors read pain claims.
Pain physician groups also warn that payer audits have grown since COVID. An independent audit lets you find issues before a payer does.
MBW RCM offers coding and audit services with certified pain coders who review claims against current LCDs and payer rules.
Want to know what your pain claims are missing? Request an MBW RCM pain billing audit and get a clear list of coding gaps, frequency risks and recoverable revenue.
Recovering What Injection and RFA Claims Miss
In injection claims, lost revenue hides in missed add-on levels, one-sided billing and session-limit denials. In RFA claims, it hides in missed additional-level codes, undocumented block relief and underpaid bilateral procedures.
A structured audit finds those gaps, rebills and appeals recover what is still collectible, and a 90-day re-audit proves the leaks are closed.
Accurate pain management coding and billing for pain management services go hand in hand. For practices that want both handled, MBW RCM provides pain management billing services built around these audit checks.