Latest / The Side Hustle Career Podcast with Fexingo: Second Income, Freelancing While Employed / How a Medical Coder Built a 9K Side Hustle in Billing Audits
Transcript
- Lucas: So we talk a lot on this show about people turning an existing skill into a side income. But sometimes the skill is so niche that it feels untranslatable. Today's guest story is about a medical coder who built a nine-thousand-dollar-a-month side hustle doing billing audits. And the key wasn't just knowing the codes — it was knowing where the errors hide. Luna: Billing audits — that sounds like something only an insurer would hire for. How did she even start? Lucas: Right, and that's the first misconception. She worked full-time in a hospital's coding department, so she knew the official coding guidelines cold. But the side gig began when a friend who ran a small physical therapy clinic asked her to look at a few denied claims. She found overcharges and coding mismatches that had been costing the clinic thousands. Luna: So a lucky first client. But how did she turn that one favor into a monthly nine thousand? Lucas: She turned it into a product. Instead of doing hourly favors, she developed a standard audit package: she'd review the last quarter of claims, flag errors, and produce a report with suggested corrections. That first clinic became a retainer client, and then she got referrals from their billing manager. Within about eight months, she had five small clinics on monthly retainers. Luna: What's the typical retainer for that kind of work? I'd imagine it varies a lot. Lucas: For small clinics, she charged between fifteen hundred and two thousand dollars a month for a quarterly audit cycle. That's about a day and a half of work per clinic. The key was packaging it as a compliance safety net, not just a one-time fix. And she always found at least a few errors, which justified the cost. Luna: It's interesting that she can consistently find errors. Are billing mistakes really that common? Lucas: More common than most people think. Studies have shown that a significant percentage of medical bills contain errors — some estimates say over fifty percent. Now, not all are intentional; many are due to outdated software, coding updates, or simple human error. But that's exactly why auditors are valuable. Luna: So she's basically a hero to these clinics. But I'm wondering about the ethics — auditing other people's billing while you're employed at a hospital. Is that a conflict? Lucas: That was her biggest worry, and she handled it carefully. She never used her employer's resources or confidential data. She did the work entirely on her own laptop, during her own hours, and she checked her employee contract for any moonlighting clauses. Her rule was simple: if it involves her employer's patients or systems, it's off-limits. Luna: Smart. But did she ever worry that her employer would see it as a threat? Like, why pay her if she's doing this on the side? Lucas: She actually told her manager about it early on, because she wanted to be transparent. Her manager was surprisingly supportive, seeing it as professional development. It also helped that she was auditing for small clinics, not competitors. The hospital didn't lose anything. Luna: That's a good reminder that transparency can be a career move, not just a risk. So what skills does someone need to get started in this niche? Is coding certification enough? Lucas: Coding certification is the foundation — that's non-negotiable. But the real edge comes from knowing the audit side: how to spot unbundled codes, upcoding, and incorrect modifiers. She also learned a lot from free webinars from the American Health Information Management Association. And she took a short course on medical billing compliance to understand the legal side. Luna: So it's not just about knowing the codes, it's about knowing the rules. And I guess the software matters too. Lucas: Absolutely. She uses a mix of standard coding software and Excel for error tracking. But she told us the most valuable tool is actually a simple checklist she built — a step-by-step audit template that she can reuse for every client. It keeps her consistent and fast. Luna: How does she find clients? I imagine cold calling a clinic might not go over well. Lucas: She started with her own network — former coworkers who had moved to smaller practices, and friends of friends. But the breakthrough came when she offered a free one-hour audit sample to a few clinics. It's a low-pressure way to show value. That landed her two retainers within a month. Luna: A free sample makes sense because the value is immediately tangible. Did she ever worry about giving away too much for free? Lucas: She did, but she limited the sample to just one claim type, like evaluation and management codes. That's enough to show expertise without giving away the whole audit. Luna: That's a good boundary. So what about the actual work — how long does a typical audit take her? Lucas: For a small clinic, she spends about three to four hours per audit, reviewing maybe fifty to a hundred claims. She starts by pulling a random sample, then she cross-references each claim against the coding guidelines. The report she produces is usually about ten pages, with specific findings and recommended corrections. Luna: That's a tight turnaround. But I'm curious — what's the most common error she finds? Lucas: By far, it's incorrect modifier usage. That's a subtle mistake — a modifier that's missing or misapplied — and it can change the reimbursement by a significant amount. She also sees a lot of unbundling, where a single procedure is split into multiple codes to get paid more. Luna: So these are real money errors. How do clinics typically react when they see her findings? Lucas: Most are relieved, honestly. They know there are errors, but they don't have the time or expertise to find them. When she shows them a ten thousand dollar overbilling mistake, they're not angry — they're grateful. That's why she's been able to retain clients for over a year now. Luna: It's a win-win, really. The clinic saves money, and she earns a solid side income. What's she done with that nine thousand a month? Lucas: She's been disciplined. She uses about a third of it to build a savings cushion, and another third to pay down student loans. The rest she's set aside for potential business expenses, like liability insurance, which she's planning to get. Luna: Insurance is a smart thought, especially in healthcare. Has she thought about turning this into a full-time thing? Lucas: She's considering it, but she's being cautious. She likes the stability of her hospital job, and the side income gives her flexibility. She's told us she'll likely go full-time once the side hustle reliably covers her current salary for at least six months. Right now, it's at about seventy percent. Luna: That's a really prudent approach — not quitting too soon. So what's the one piece of advice she'd give to someone thinking about a similar niche? Lucas: She says: 'Don't wait until you feel ready. Start with a small project, even if it's free, and learn by doing.' She also stresses that you don't need to know everything — you just need to know more than your client. That confidence comes from practice, not from a certification. Luna: That's a great note to end on. And if you're a listener who's been thinking about turning your niche skill into extra income, we hope this story gives you a few practical ideas. Lucas: And if you've gotten something out of these episodes, a couple of dollars a month genuinely keeps them going. You can buy us a coffee at buy me a coffee dot com slash fexingo. It's a small way to say thanks, and it really makes a difference in keeping this show ad-free. Luna: Yeah, every little bit helps us keep bringing you stories like this. So thanks for considering it. Lucas: But back to the topic — if you're exploring a similar side hustle, one takeaway to remember is that the most valuable niches are often the ones you already know deeply. Medical coding seemed boring to most people, but for her, it was a goldmine. Luna: Exactly. And I think that's the lesson — look at your daily work with fresh eyes. What problems do you solve without thinking? That might be someone else's pain point. Lucas: Right. So next time you're at your desk, ask yourself: what do I know that others don't? For her, it was a checklist. For you, it might be a spreadsheet, a process, or a skill in a niche software. The side hustle is waiting.