In-house vs outsourced billing: the real maths

Most comparisons of in-house versus outsourced billing are published by billing companies, which tells you how they tend to conclude. The honest version is narrower than either side usually claims: it depends on your volume, and the break-even is higher than most practices expect.

The in-house cost, fully loaded

A salary is not the cost of an employee. For a billing specialist in the United States, the realistic annual total is roughly:

Fully loaded, one biller costs somewhere between $60,000 and $85,000 a year.

Then there are the costs that only appear when something goes wrong. Coverage during holiday and sick leave. The hiring cycle when they resign — typically six to twelve weeks during which claims age. The institutional knowledge that leaves with them, which in a single-biller practice is all of it.

The outsourced cost

Nearly universally a percentage of collections, typically 4% to 9% depending on specialty, claim volume and average charge.

On $1.2 million of annual collections at 6%, that is $72,000 — roughly one fully loaded biller.

So the headline comparison is closer than either side admits. What separates them is everything either side of the headline.

Where the real difference sits

Incentive alignment. A salaried biller is paid the same whether a denial is appealed or written off. A percentage model is only paid when money arrives. That is the strongest argument for outsourcing, and it is structural rather than a matter of diligence.

Capacity at the tail. Aged A/R and appeals are the work that gets dropped first when one person is covering everything. It is also where the recoverable money concentrates. A team absorbs that; an individual, realistically, does not.

Specialisation. Payer rules differ by state, plan and specialty, and they change. Keeping current is a part of the job that a single in-house biller has little time for.

Control and proximity. This genuinely favours in-house. Someone down the hall who knows your patients and can walk to the front desk has advantages no service level agreement reproduces.

Where the break-even actually falls

Roughly:

• Under ~$600k collections — outsourcing is almost always cheaper. The fixed cost of an employee cannot be spread across enough revenue.
• $600k to $2m — genuinely close. Decide on capability and incentives, not on cost, because the costs are comparable.
• Over ~$2m — in-house becomes cost-competitive, and a hybrid often wins: in-house for routine claims, outsourced for denials, appeals and aged A/R.

The question that actually settles it

Not "which is cheaper" but "what is our current collection rate, and what would it be under the alternative?"

A practice collecting 86% of billed charges that moves to 95% has gained nine points of revenue. On $1.2 million of charges that is $108,000 — more than the entire cost of either option.

The cost comparison matters far less than the performance difference, which is why it deserves less attention than it usually gets.