Most practices hire a medical biller the same way they hire a receptionist: look at the resume, call the references, go with their gut. The biller starts. Three months later AR is climbing and nobody knows why.
Medical billing competency is invisible during an interview. A biller can speak confidently about claim submission workflows and have no idea what the 8-Minute Rule is, why the AT modifier matters for chiropractic Medicare claims, or what CO-50 means on a denial. The only way to identify the difference before you hire is to ask the right questions — and know what the right answers are.
Before You Interview: Define What You Actually Need
The single biggest mistake in medical billing hires is describing the job as “medical billing” without specifying the specialty, the EHR, and the payer mix. A biller who is excellent in general internal medicine E/M billing may never have seen a cardiology prior authorization or an EMS patient care report. Specialty-specific knowledge is not transferable — it’s built through years of repetition in one area.
Before any interview, document: your specialty (or specialties), your primary EHR, your top 5 payers by volume, and your current biggest billing pain point. The right candidate can answer specific questions about all four.
The 8 Interview Questions That Reveal True Billing Competency
1. “What is your clean claim rate from your last position, and how did you measure it?”
A strong biller knows their number. Not a range. Not “pretty high.” A number — 96.2%, 94.8% — with an explanation of how it was calculated and what they did to maintain it. A biller who can’t answer this question has never tracked their own performance. That’s a significant red flag in a role where performance determines your cash flow.
2. “Walk me through what you do when a claim comes back CO-50.”
CO-50 means non-covered service or no prior authorization. The correct answer covers: identifying whether the service required auth and whether it was obtained, pulling the auth number if it exists, checking whether the diagnosis supports medical necessity, drafting a medical necessity appeal if the auth was obtained but payer denied anyway, and escalating to the physician if documentation is insufficient. A biller who says “I call the payer” and stops there hasn’t worked denials at a high level.
3. “What is the 8-Minute Rule and when does it apply?”
This is a PT/OT-specific question. If you’re hiring for a PT practice, this is mandatory. The correct answer: the 8-Minute Rule applies to timed CPT codes under Medicare — therapeutic exercise, neuromuscular reeducation, manual therapy. It governs how many units can be billed based on actual timed minutes, and it’s different from the 15-minute block logic that non-PT billers default to. If your candidate is applying for a PT biller role and doesn’t know this rule, they will generate systematic billing errors from week one.
4. “How do you handle carve-out payer routing in behavioral health?”
For mental health, psychiatry, or behavioral health practices: the candidate should know what a carve-out is (behavioral health benefits managed by a separate entity like Magellan or Optum Behavioral, separate from the primary commercial insurer), how to identify it at eligibility verification, and how to route the claim correctly. A biller who submits all claims to the primary commercial insurer without carve-out awareness will generate systematic CO-109 denials on behavioral health claims.
5. “What is your process for prior authorization tracking?”
The answer should include: a system for tracking active authorizations (per patient, per CPT code, per payer), expiration date monitoring, renewal lead time awareness, and what happens when a session is rendered without authorization. “I check before the patient comes in” is not a process. A real process has a daily review, alerts set at 7 days before expiration, and a clear workflow for what happens when auth lapses.
6. “How do you handle an aging AR account where the timely filing window is closing?”
The answer should demonstrate urgency triage: identify exactly how many days remain before the timely filing deadline for each payer on affected claims, prioritize by dollar value and days remaining, pull the denial reason for each account, draft the appropriate appeal or corrected claim, and submit before the window closes. A biller who treats AR management as a background task rather than an active urgency queue will cost you money on claims that were recoverable.
7. “Tell me about a billing error you made and what you did about it.”
This is a character and process question, not a competency question. The right answer is a specific, honest description of what happened, how it was caught, what the financial impact was, and what changed in their process to prevent recurrence. A candidate who says they’ve never made a billing error is either lying or hasn’t been doing this long enough. A candidate who describes an error thoughtfully with a clear fix demonstrates the accountability and self-awareness you want in someone managing your revenue cycle.
8. “What would you do in your first 30 days to understand our current billing performance?”
The answer should include: pulling a 90-day denial reason report, reviewing the AR aging by payer, checking the clean claim rate by CPT code and provider, identifying the top 3 denial patterns, and reviewing any write-offs from the last 90 days for patterns. A biller who starts by learning the EHR interface and submitting claims from day one without auditing the current state of the billing is a biller who will continue whatever problems already exist without identifying them.
What to Verify Before You Extend an Offer
After the interview, three verifications matter:
HIPAA training documentation. Ask for a certificate from a recognized HIPAA training provider within the last 12 months. Not a verbal confirmation — documentation.
EHR proficiency test. Set up a test environment in your EHR and give the candidate 30 minutes to complete a set of billing tasks — claim entry, denial response, ERA reconciliation. The result tells you more than three interviews.
Reference check with a specific question. Ask the reference: “What was this person’s clean claim rate, and did AR improve or decline during their tenure?” A reference who can’t answer this question either wasn’t close enough to the work to know, or the answer isn’t positive.
What to Look For vs. Red Flags — Quick Reference
| What to Look For | Red Flag |
|---|---|
| States their clean claim rate with a specific number | “I always get great results” with no data |
| Describes a specific denial workflow for CO-50 | “I call the payer and figure it out” |
| Knows the 8-Minute Rule unprompted (for PT roles) | Has never heard of it or confuses it with 15-min billing |
| Explains carve-out routing for behavioral health | Doesn’t know what a carve-out is |
| Has a documented prior auth tracking process | “I keep track of it in my head” or loose notes |
| Describes urgency when timely filing is closing | Treats all AR work as equal priority |
| Honestly describes a specific billing error and the fix | Claims to have never made a mistake |
| Defines a 30-day audit plan on day one | Wants to start submitting claims immediately |
| HIPAA training certificate within 12 months | Verbal assurance — no documentation |
| Will take a 30-minute EHR proficiency test | Refuses or deflects (“I learn fast”) |
The Alternative: Skip the Hiring Process Entirely
A dedicated offshore billing specialist at Dr. Billerz bypasses the hiring risk entirely. Specialty-matched placement. EHR-specific training. A free dedicated RCM manager overseeing performance. HIPAA-certified infrastructure. And a 4-week free pilot before you spend anything — so you see what dedicated billing produces before you commit.
At $7/hr, the cost is less than most in-house billers command. The risk is zero. Book a free 15-minute call to see how the placement process works.