Every version of this decision gets framed the same way. A biller costs about this much. A billing service costs about that much. Somewhere around a certain level of collections the arithmetic flips, and above that line you should hire.
The framing is clean, it is easy to explain, and it produces the wrong answer often enough to be expensive.
Both options cost you the same two things
Whoever does your billing, your practice loses money in exactly two places.
What you fail to collect. Expected revenue that never arrives — denials abandoned, timely filing missed, underpayments never appealed, claims that fell out of a queue nobody was watching. This is your net collection ratio, and the gap between it and 100% is real money.
What you pay to collect. A salary, or a percentage. This is the number everyone compares, and it is the smaller of the two.
The salary-versus-fee framing compares only the second one. That is why it misleads. The first is usually larger, and it is the one that differs between a good billing operation and a mediocre one.
Consider a practice collecting $250,000 a month from payers. A biller at roughly $5,460 a month fully loaded who runs an 88% net collection ratio leaves $30,000 a month uncollected. A full billing service at 6.5% charges about $15,400 a month — nearly three times the salary — but at a 95% collection ratio leaves only $12,500 on the table. Total cost of the biller is $35,460 a month. Total cost of the service is $27,900.
The cheaper invoice costs $90,000 more a year.
Reverse one input and it reverses completely. Give the in-house biller the same 95% collection ratio, and her total cost drops to $17,960 — the service now costs $120,000 a year more. Same practice, same revenue, same salary. The only thing that changed was performance.
The number to work out is a collection rate, not a threshold
The question is not “am I big enough to hire a biller.” It is “can my billing operation collect well enough to be worth the salary?” — and that has an exact answer.
The collection rate an in-house team must hit to match a full billing service is:
The service’s collection rate, multiplied by one minus its fee, plus your staff cost divided by your monthly revenue.
At a service running 95% for a 6.5% fee, against a biller at $5,460 a month:
| Monthly payer revenue | Your biller must collect |
|---|---|
| $60,000 | 97.9% |
| $150,000 | 92.5% |
| $250,000 | 91.0% |
| $400,000 | 90.2% |
| $800,000 | 89.5% |
| $1,000,000 | 89.4% |
Two things fall out of that table, and both are more useful than a revenue threshold.
The bar falls as you grow, but it never falls far. A fixed salary spreads across more revenue, so a larger practice justifies a biller more easily. But the curve flattens fast. Between $400,000 and $1,000,000 a month the required collection rate barely moves.
There is a floor, and below it practice size is irrelevant. As revenue rises, the staff-cost term shrinks toward nothing and the required rate converges on the service’s collection rate net of its fee — 88.8% in this example. If your billing operation collects below that, no practice is large enough to make hiring the right answer. You cannot grow your way out of an eight-point collection gap, because the gap grows with you.
That floor moves with the terms. A service at 95% and 8% has a floor near 87.4%. One at 93% and 5% lands near 88.3%. The arithmetic is simple enough to run on the terms you are actually quoted, which is the point.
Why 88% is not a pessimistic assumption
The illustrative in-house rate above is not a strawman. A few benchmarks put it in context.
HFMA regards a net collection ratio at or above 95% as the marker of a healthy revenue cycle. That is the target, not the average.
Against that, a Premier survey of providers found nearly 15% of private-payer claims denied on first submission, with a little over half eventually overturned on appeal. Read the second figure carefully — it means close to half of denied dollars are never recovered by practices without a functioning appeals process, and “functioning appeals process” is precisely what a single biller covering intake, posting, follow-up, and patient calls does not have time to run.
Experian’s provider survey found a rising share of organizations reporting denial rates at or above 10%. Chiropractic and physical therapy commonly sit in the mid-to-high teens where Medicare modifier logic goes wrong; behavioral health runs higher still on authorization intensity and parity complexity.
None of this says an in-house biller is bad at her job. It says the work is large, the rules change constantly, and one person carrying all of it will drop some of it.
What the arithmetic leaves out
The model above is honest about cost and silent about four things that belong in the decision.
- Coverage. One biller is one point of failure. When she takes two weeks off, claims still go out and denials still arrive. When she leaves, the payer rules in her head leave with her, and the practice discovers what was undocumented at the worst possible moment.
- Escalation. A stuck claim needs someone who has fought that payer before. A solo biller has nobody to escalate to.
- Rules maintenance. Payer rules change continuously. Somebody has to track that, and it is not billable time.
- Load on the owner. The real cost of in-house billing frequently shows up as the practice owner spending evenings on remits. That does not appear in any salary line.
When in-house is the right call
- You already have a good biller. This is the whole test, and it is worth stating plainly because everything above can read as an argument against a decision you have already made well. If your collection ratio is at or near the benchmark, keep her — the arithmetic favors you decisively.
- Your volume is high and your payer mix is simple. Fixed cost amortizes; a narrow payer set is learnable.
- You have more than one biller. Two people at $11,000 a month running 92% on $400,000 of revenue beat a service at 6.5% and 95%. Coverage and escalation problems largely resolve at that size too.
- Control matters more to you than the delta. Some owners want the billing function in the building, close to the front desk and the schedule. That is a legitimate preference and it has a price you can now calculate.
When a billing service is the right call
- You are small. At $60,000 a month the required collection rate is 97.9% — above the benchmark for a healthy revenue cycle. A solo biller carrying every other administrative task will not hit it, and the fixed salary is simply too large a share of your revenue.
- You are new to insurance. No denial history, no payer-specific knowledge, no biller who has seen your mix. A practice coming off a cash model is the clearest case: learning insurance and building a billing operation at the same time fails as accounts receivable you cannot recover.
- Your payer mix is shifting. New contracts, a new specialty, personal injury, workers’ comp. Every shift is a rule set your team has to learn and a service already knows.
- You are adding locations or providers. Billing complexity scales faster than billing headcount, and the second location is where in-house operations usually break.
- Your denial rate is already above 10% or your A/R past 120 days is above 17%. At that point the constraint is expertise, not tooling. Better software in the same hands will not close the gap fast enough.
The question to ask a prospective billing partner
If the decision turns on collection rate, then collection rate is what you should be asking about — and most sales conversations never get there because both sides are discussing the fee.
Ask for net collection ratio on practices in your specialty and your size band. Ask what share of denials get appealed rather than written off. Ask what happens to a claim that is denied twice. A partner who cannot answer those in specifics is selling you a fee, and the fee was never the expensive part. If you are still building a shortlist, our rundown of the top medical billing companies is a place to start.
Run it against your own numbers. The RCM billing calculator has three views: what your collection ratio costs you, what aged A/R costs you, and — in the third tab — exactly the comparison above. Enter your revenue, your staff cost, and both collection rates, and it returns the rate your in-house team has to hit to match a full billing service on your terms.
Still deciding whether to bill insurance at all? Start with the enrollment question instead — for chiropractic practices or for private-pay mental health practices.
Sources: Healthcare Financial Management Association net collection ratio benchmarks; Premier Inc. national provider survey on private-payer claim denials and appeal outcomes; Experian Health State of Claims provider survey; U.S. Bureau of Labor Statistics Occupational Outlook Handbook, Medical Records Specialists (SOC 29-2072), May 2025 — median annual wage $51,140, tenth percentile below $37,000, ninetieth above $81,150. Loaded staff cost above assumes payroll tax and benefits at approximately 28% of salary. Fee rates, collection ratios, and salaries vary substantially; the figures here are illustrative inputs, not quotes.