Is Outsourced Medical Billing Worth the Percentage, or Should a Practice Bill In-House?

What in-house billing costs, against a percentage of collections

Start with people, the line that has a federal number. The U.S. Bureau of Labor Statistics puts the May 2025 median annual wage for medical records specialists, the occupation that includes medical coders, at $51,140, and at $47,120 in offices of physicians. For billing and posting clerks, who calculate charges and prepare bills, the May 2025 median was $48,500. Those are wages. BLS’s employer-cost survey for June 2026 puts private employers’ benefit costs at $14.07 an hour on top of $32.82 in wages and salaries, about 43 cents for every wage dollar, averaged across all private industry rather than billing jobs alone.

Then add the lines the practice can price from its own payroll and written quotes: a second person trained to cover absences, the billing side of the practice management system, clearinghouse fees, training and coding references, and the owner’s review time. The same CMS guidelines list software, licensing fees, training, conversion costs and annual software maintenance among the costs to weigh when comparing vendor proposals.

Illustrative example, with round numbers that are assumptions rather than market rates: a practice collects $2.4 million a year and figures billing needs two full-time people. Two salaries at the $51,140 median come to $102,280, and benefits at the June 2026 private-industry ratio bring that to about $146,000. With a placeholder of $30,000 a year for software, clearinghouse and training, in-house billing costs about $176,000, or about 7.3 percent of collections. That is the break-even rate: a quote below it costs less on paper, one above it costs more. The practice’s own payroll and quotes replace every assumption.

A percentage quote can only be set against that rate once its base and exclusions are in writing. Ask for each of these:

• The base: insurance payments only, or patient payments too, including copays the front desk collects without the billing company’s help.
• Old receivables: whether claims from before the start date are worked, and at what rate.
• Extras: setup fees, statements and postage, credentialing, coding, and any monthly minimum.
• Software and clearinghouse: whether the practice still pays for its own on top of the fee.
• Recoupments: whether the fee is reversed when a payer takes money back.
• Work left in-house: the staff hours still spent on billing questions and follow-up, priced like the lines above.

The incentive matters as much as the rate. A fee tied to collections pays more for working a large claim than a small one, so ask how low-balance denials and small patient balances get worked, and keep the authority to approve write-offs with the practice.

What each option leaves the practice owning: data, reports, denial work

With in-house billing, the system, the clearinghouse account, the remittances and the history belong to the practice by default. With a billing company, each of those is a contract term, and the terms matter most on the day the practice wants to change course.

A billing company that handles patient information is a business associate under HIPAA: 45 CFR 160.103 names billing among the functions that make an outside firm one, and 164.504(e) lists what the business associate agreement must contain. One term points at the exit: at termination the business associate must, if feasible, “return or destroy” the protected health information it still holds. The practice’s compliance officer or attorney writes the agreement; the operational point is to get the data back in a usable format before anything is destroyed.

The HHS Office of Inspector General made a related point in its 1998 compliance guidance for third-party medical billing companies, recommending that the contract “enumerate those functions that are shared responsibilities and those that are the sole responsibility of either the billing company or the provider.” Under either option, check who holds each of these, by name:

• The practice management system and its data: whose license, and whether the practice can export claims, payments and adjustments at any time.
• The clearinghouse account and the remittance enrollment: in whose name, and who receives the remittances.
• Payer portal logins: issued to the practice’s staff or to the billing company’s.
• The bank account payers deposit into: in the practice’s name only.
• Reports: named in writing, delivered on a fixed day, as files the practice keeps.
• Denials and write-offs: who works each denial and by when, and who may approve a write-off, up to what amount.
• Credit balances: who finds them, and who returns them.

In-house billing does not settle these on its own. A biller who set up the clearinghouse account under a personal email address, or who alone knows the portal passwords, leaves the practice in the same spot as a vendor contract with no exit clause.

How much owner oversight each option needs

Both need the same review, because the practice answers for the claims either way. What differs is what can go wrong between reviews. In-house: one person holding the whole process, no cover during absences, and the same person posting payments and writing off balances. Outsourced: reports the practice cannot check against its own records, and work the contract never named.

The monthly read fits on one page, reviewed at a fixed meeting with the biller or the billing company. The guide to checking a billing company’s work lists the eight reports behind it; the page is the same for both options:

• Collections against the allowed amount, this month and the same month last year.
• Accounts receivable more than 90 days from the date of service, by payer.
• The top denial reason codes by dollars, with the action taken on each.
• Rejections still open, aged from the date of service.
• Write-offs by reason and approver, with timely-filing write-offs on their own line.
• Payments on the remittances matched to bank deposits.

Weekly, two short lists keep the month honest: visits with no claim yet, which is where unsigned notes and missing charges show up, and rejections more than a few days old. In-house, add one control: the person who posts payments is not the only one who can approve a write-off. Outsourced, add read-only access to the practice management system and the clearinghouse, so the owner can pull a report without asking.

Percentage fees: the Medicaid rule and the OIG’s concern

Medicare limits percentage pay for a billing agent that receives the practice’s Medicare payments, so the question for a percentage quote is who receives the money and who controls the account it lands in. The rule and its scope are in the guide to checking a medical billing company’s work.

Medicaid has its own version. Under 42 CFR 447.10(f), which each state’s Medicaid plan must carry, a business agent such as a billing service that “furnishes statements and receives payments in the name of the provider” may be paid only if its compensation is related to the cost of processing the billing, “Not related on a percentage or other basis to the amount that is billed or collected,” and not dependent on collection.

Beyond the payment rules, the OIG’s 1998 guidance says it “has a longstanding concern that percentage billing arrangements may increase the risk of upcoding and similar abusive billing practices,” and that for billing companies that provide marketing services, percentage arrangements may implicate the anti-kickback statute. State fee-splitting rules can add their own limits. This is rule text, not legal advice; the practice’s attorney should read any percentage contract before it is signed.

How to switch either way without losing claims in the gap

A switch loses money in the gap between two owners: claims nobody sends, rejections nobody works, remittances nobody reads. The fix is one rule, set before the date and the same in either direction. The outgoing side keeps every date of service before the cutover until it is paid, closed with a stated reason, or handed over by name; the incoming side owns every date of service from the cutover on.

Medicare adds steps of its own. The claims manual says providers are obligated to notify their Medicare Administrative Contractor in writing, in advance, of a change in billing agent or clearinghouse and of the date they will stop using one. Claims and electronic remittances each need an enrollment form on file, the new billing company or clearinghouse needs its own EDI number before the contractor can process the change, and depending on the contractor a newly signed form may be required. The group enrollment application, CMS-855B, carries a billing agency section, and 42 CFR 424.516(d)(2) gives physician practices 90 days to report enrollment changes other than ownership, adverse legal actions and practice locations. Commercial and Medicaid payers set their own steps.

• Notice and run-out: the notice period, who works old dates of service, for how long and at what fee, and the date the outgoing side hands back what is left.
• Data: a full export of claims, payments, adjustments and open balances, received and opened before the agreement’s return-or-destroy step.
• Enrollments: Medicare claim and remittance enrollment for the new submitter, the written notice with its effective date, the billing agency section, and each commercial payer’s remittance setup.
• Payments: if electronic payments land in an account in the practice’s name, a change of biller does not move them; confirm it before the cutover.
• Open claims: every unpaid claim by payer and date of service, with each payer’s filing limit beside it. Medicare’s is one calendar year from the date of service under 42 CFR 424.44.
• Rejections: every open rejection on its own list, because a rejected claim was never filed and its clock keeps running.
• Credit balances: a list at the cutover, with who resolves each one.

Then reconcile weekly until the old list reaches zero: open claims by age, open rejections, and deposits against remittances. A move in-house adds one step at the front: hire and train before the cutover, because the old company’s run-out ends on its date whether or not the new team is ready.

When neither option is the fix, and where the Review fits

Sometimes the billing model is not the problem. If denials trace back to registration, authorizations or notes signed late, a new billing company inherits them, and so does a new in-house hire. If the current company sends the reports, they reconcile to the deposits and the numbers move at the monthly meeting, a switch buys a run-out and a learning curve. And if the owner cannot yet say what in-house billing would cost, the break-even rate is the first number to get, from payroll and two written quotes, before anyone signs anything.

The Revenue Review reads the claim-to-payment hand-off for an independent medical practice whether billing is in-house or outsourced. Its first pass reads aggregate exports — payments by payer, denials by reason code, aging, write-offs and deposits — not patient names. It takes two weeks and ends in a written report the practice keeps, with a monthly dollar figure wherever the records support one. It sells no billing services, so it has no stake in which option the practice chooses, and it gives no legal or coding advice.

If the numbers suggest it, the next step is a free 20-minute call to say whether the Review fits.