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A Targeted Probe and Educate (TPE) letter from your Medicare Administrative Contractor isn’t a punishment—it’s a structured opportunity to correct billing issues before they escalate. TPE audits review 20–40 claims per round across up to three rounds, with mandatory one-on-one education between each. Labs are selected based on data-driven red flags like high error rates, missing Z‑codes, or billing patterns that deviate from peers.
Failure to improve can lead to 100% prepay review or referral to fraud investigators, but most labs clear TPE in a single round by promptly responding to documentation requests, fixing root causes like missing signatures or incomplete medical necessity notes, and attending the education session. A lab billing partner, like TransLabs, that keeps MolDX registrations current, documentation audit-ready, and denial triggers addressed early can make TPE preparation routine, protecting revenue and keeping your lab off the radar entirely.
Have you ever received a letter from your Medicare Administrative Contractor (MAC) that reads “Targeted Probe and Educate”? If yes, this letter means your MAC is set to conduct a TPE audit for your laboratory. While many labs worry when they read the word “audit”, it’s different from the regular process. It’s just about fixing issues with claim submissions before they evolve into bigger issues.
A lot of labs find it a difficult process as they don’t understand the rules of the game. Due to that, they miss deadlines and send incomplete records, which makes things worse.
Here, we’ll discuss what TPE is, how MACs pick labs, and how to maintain a smooth revenue cycle with laboratory RCM services while preparing for TPE audits. So, let’s get started!
Targeted Probe and Educate (TPE) is a Medicare medical review program run by your MAC. In the context of lab billing, this audit specifically targets certain labs with billing patterns that differ from other labs.
According to the Centers for Medicare & Medicaid Services (CMS), most labs never face a TPE review at all. This program targets labs whose claims data shows unusually high error rates on past claims, or billing on services and codes that carry a high national error rate and pose financial risk to the Medicare program. If your lab’s claims are clean, you’re simply not on the radar.
| Audit Type | Purpose | Who Runs It |
|---|---|---|
| TPE | Educational review of specific providers with error-prone billing | Your Medicare Administrative Contractor (MAC) |
| CERT | National sampling to measure the overall Medicare improper payment rate | Comprehensive Error Rate Testing contractor |
| RAC | Post-payment review to recover improper payments across a broad claims pool | Recovery Audit Contractor |
| UPIC | Fraud, waste, and abuse investigation, often triggered by a failed TPE | Unified Program Integrity Contractor |
TPE runs the audit process through three rounds. Each round reviews 20 to 40 claims, followed by one-on-one education. Labs get at least 45 days to fix problems before the next round starts.
Here’s the play-by-play in the table below:
| Round | Claims Reviewed | Next Step |
|---|---|---|
| Round 1 | 20 to 40 claims (fewer for low-volume billers) | Written results letter, followed by a live one-on-one education call with the MAC |
| Round 2 | Another 20 to 40 claims, at least 45 days later | Second results letter and a second education session if errors persist |
| Round 3 | Final batch of 20 to 40 claims | If errors are still high, the lab gets referred to CMS for next steps |
This is something every lab biller wants to know. As we’ve mentioned earlier, labs get flagged when their billing patterns are different from peers, especially around molecular and genetic testing, toxicology, and codes with high national improper payment rates.
MACs lean on data analytics. A few red flags show up again and again in lab-specific TPE selections:
Sudden spikes in billing volume that don’t align with historical trends
If none of these match your lab billing process, that’s a good sign. Compliant billers simply don’t end up on this list.
When you’re selected for the review, the MAC sends an Additional Documentation Request, or ADR, for each claim under review. Labs typically need to gather:
If you miss the deadline on ADR as mentioned in the letter by MAC, your claim is automatically denied. To prevent that, set a calendar reminder the day the letter arrives; don’t wait for a second notice.
The following are some billing errors where labs fail TPE audits:
These billing errors are the main purpose of these TPE audits: catch errors to prevent future major revenue gaps. And guess what? That’s completely possible with the right strategy and proactive decisions that protect your claims. You can prevent that with precise and compliant billing. It doesn’t just help you to clear TPE audits but also secure your reimbursements.
If your lab bills molecular or genetic tests through Palmetto GBA, Noridian, CGS, or WPS, you’re already following the MolDX program’s rules. And in 2026, the program is under intense payer review. CMS has been weighing whether to expand MolDX to every MAC jurisdiction, partly because labs operating under MolDX show lower rates of improper payment for genetic testing compared to jurisdictions that haven’t adopted it.
Here is how you should act:
The better approach is to proactively make corrections in your billing processes for molecular testing claims before a MAC sends a TPE letter your way. If you haven’t received a TPE audit letter yet, start making corrections in your billing process now, so you’ll never have to receive that letter.
Here are a few ways to get prepared for a TPE audit and pass it clearly:
This is the outcome nobody wants, and honestly, it’s rare. Most labs improve well before round three wraps up. But if errors stay high, here’s what can follow:
None of this happens overnight, and none of it happens without warning. That’s the entire point of the three-round structure: it gives labs multiple honest chances to correct course first.
Labs that handle billing in-house, with a small team stretched thin across coding, collections, and compliance, are the ones most likely to get caught flat-footed by a TPE letter. A dedicated lab billing partner, like TransLabs, provides you with professional advice to keep documentation audit-ready year-round. That means Z-code registrations stay current, medical necessity notes get built into the workflow from day one, and a billing staff expert monitors the LCD updates before they turn into denials.
To put it simply, TPE readiness isn’t a one-time project. It’s a habit. Labs that treat documentation discipline as part of daily operations rarely get a second look from their MAC.
The best time to organize your documentation is before a probe letter shows up. Here are a few proactive steps that protect your lab from TPE in the first place:
Doing all that keeps your lab secure.
A TPE letter isn’t a verdict. It’s an invitation to fix small problems before they become expensive ones. Labs that stay ahead of documentation gaps, keep Z-codes and MolDX approvals current, and respond fast to every ADR almost always clear TPE in a single round. The labs that struggle are usually the ones treating billing compliance as an afterthought rather than a daily habit.
So, know your codes, document your medical necessity, and don’t let a TPE letter come your way.