What an ASC implant carve-out has to define

The six questions post made two claims about implant carve-outs in a sentence each. A contract that does not define “implant” leaves the definition to the payer. And a carve-out is only as good as its definition of invoice cost. This is the long version of both.

It is read from the documents that actually define those terms. Three workers’ compensation fee schedules (federal, Illinois and Texas) spell out what an implant is and what its cost includes, because a regulator that pays on the invoice has to. Two commercial payers, UnitedHealthcare and Blue Cross and Blue Shield of New Mexico, publish reimbursement policies that do part of the same job.

The fee schedules govern workers’ compensation claims, not your commercial contracts, and each payer policy governs only that payer’s claims. They are useful here for a different reason: they disagree with each other, and every disagreement marks a term that a contract either settles or leaves open.

The contract wins, but only where it says something

Start with the fine print, because it decides how everything else applies.

Blue Cross and Blue Shield of New Mexico’s implant policy opens with a disclaimer: if a reimbursement policy conflicts with a provider contract, “the provider’s contract will govern.” UnitedHealthcare’s policy names provider contracts among the factors that may “supplement, modify or, in some cases, supersede” it.

That reads as good news for the facility, and it is, on one condition. A contract that says nothing about a term does not conflict with the policy, so the policy applies. Every section below is a term where that happens.

What counts as an implant depends on who is asking

There is no single definition. There are at least five, and they draw the line in different places.

• The FDA. In its device classification rules, an implant is “a device that is placed into a surgically or naturally formed cavity of the human body,” and it counts only if it is intended to remain implanted continuously for 30 days or more. That definition was written to classify devices, not to pay claims.
• UnitedHealthcare. Its commercial facility policy on devices and implants borrows the FDA definition. The policy is written around hospital outpatient claims, and its application section extends it to ASCs that bill on the UB-04. A line under revenue code 0278 needs a HCPCS code that meets the FDA definition, or it is not reimbursed. The policy also excludes “liquids or other materials that are absorbed by the surrounding tissue,” and any supply or instrument meant to be removed or discarded during the same procedure.
• Blue Cross and Blue Shield of New Mexico. The same 30-day basis, with exceptions for shorter-lived devices that deliver medication, monitor body functions or support organs and tissues. Its examples of implants include metal anchors, and pins, plates or metal screws.
• Texas workers’ compensation. An implantable is an object or device that is surgically implanted, embedded, inserted or otherwise applied, plus the equipment needed to operate, program and recharge it. There is no duration test at all.
• Illinois workers’ compensation. Implants are defined by revenue code. Lines under 0276 (lens implant) and 0278 (implants) are paid off the manufacturer’s invoice. A line under 0275 (pacemaker) is paid as a percentage of charge, alongside prosthetics and orthotics.

Put those side by side and the gaps land in an ordinary orthopedic case mix.

CMS’s own list of pass-through device codes carries one for absorbable bone anchors and screws. Blue Cross New Mexico’s examples name metal anchors and metal screws. UnitedHealthcare excludes materials absorbed by the surrounding tissue, and its examples include sealants, hemostats and bone putty. Neither policy says in so many words where an absorbable anchor falls.

Temporary fixation splits the same way. A pin intended to come out before 30 days fails the FDA test. Under the Texas definition, which has no duration test, it is still an implantable.

None of these questions has one right answer. Where your contract is silent, the payer’s policy and the payer’s reading of it supply one.

Invoice cost: three variables, four answers

The six questions post named the three variables that decide invoice cost: shipping, tax and rebates. Here is how each source resolves them, in its own words.

• Federal workers’ compensation (OWCP). Acquisition cost “equals the wholesale cost plus shipping, handling and sales tax, net of all discounts,” billed together as one charge. It applies where the fee schedule sets no maximum fee for the implant.
• Illinois. Implants are paid at 25% above “the net manufacturer’s invoice price less rebates, plus actual reasonable and customary shipping charges.”
• Texas. The lesser of the manufacturer’s invoice amount or the net amount “exclusive of rebates and discounts,” plus an add-on covered in the next section. The rule does not mention shipping or tax.
• Blue Cross and Blue Shield of New Mexico. It sets no cost formula, but it does rule on one variable: “Provider or vendor administrative storage and delivery costs will not be reimbursed.”

So shipping is part of cost in one source, added on top in another, excluded in a third and unmentioned in a fourth.

Order matters as much as inclusion. The Illinois Workers’ Compensation Commission publishes a worked example that shows the order: sales tax goes into the invoice price before the markup, and shipping is added after it, at cost.

1. An invoice of $1,010 plus $10 of tax: $1,020.
2. Less the $20 rebate: $1,000.
3. Plus 25%: $1,250.
4. Plus $25 of shipping, at cost: $1,275.

Two contracts that both say “invoice cost plus 25%” can pay different amounts for the same implant. The difference is where tax, rebates and freight sit in that sequence, and a contract that names the percentage without the sequence has left it to the payer.

Rebates raise one more question the formulas do not answer on their own: which rebates. A discount printed on the invoice is known when the claim goes out. A rebate earned on volume and settled later may not be. Texas addresses it in the certification covered below.

A markup is a formula, not a percentage

Texas pays a separately requested implant at its cost plus “10 percent or $1,000 per billed item add-on, whichever is less, but not to exceed $2,000 in add-on’s per admission.”

The state’s FAQ on the rule works an example. Three devices, each invoiced at $20,000 with a $2,500 rebate, for $17,500 net apiece. Ten percent of each would be $1,750. The per-item cap brings the first two add-ons down to $1,000, and the per-admission cap leaves the third with nothing. On $52,500 of net implant cost, the add-on comes to $2,000.

The bigger term is not in the add-on at all. In Texas, asking for separate implant payment changes what the procedure itself pays. For a procedure that is not device-intensive, the facility rate is 235% of the Medicare ASC rate when the implant stays in the procedure payment, and 153% when separate implant payment is requested. A carve-out can lower the procedure rate it was carved out of.

The state’s own training presentation shows what that does to an inexpensive implant, using a radius fracture repair (CPT 25515) at 2008 rates.

• Implant left in the procedure payment$3,591.04
• Implant paid separately, $300 certified cost$2,667.99

Texas Department of Insurance, Division of Workers’ Compensation, Ambulatory Surgical Center Fee Guidelines training presentation, scenarios 2 and 3. Abilene, Texas, at 2008 Medicare rates: 235% of $1,528.10 when separate implant payment is not requested; 153% of $1,528.10 plus $330 when it is.

Asking for separate payment on that $300 implant lowered the facility’s payment by $923. Run the same figures forward and the separate route only comes out ahead once the certified implant cost passes about $1,140. Texas lets the ASC make that choice case by case. A commercial contract may not offer the choice at all, which is one more reason to know the break-even before signing.

The same structure shows up in commercial terms. A June 2010 ASC guideline from Blue Cross Blue Shield of Wyoming, old but still posted, paid “the invoice amount of this item plus 10%” when “the cost of a device or multiple devices inserted into the body exceeds $500,” and warned that “when implants are billed separately, allowances for other facility services may be reduced.”

That threshold sentence is also a fair example of how much one line can leave open. Is the $500 measured per device, or across every device in the case? On what the center paid, or on what it billed? The contract is the place to answer both.

What the payer will accept as proof

The number is half of it. Each source also says what has to arrive with the number.

• OWCP pays acquisition cost when the bill comes with “a copy of the original invoice clearly showing invoice cost less applicable discounts.” A hard copy is required whenever an individual device or supply costs $150 or more, and wholesale invoices are kept for at least three years.
• Blue Cross and Blue Shield of New Mexico may require the vendor invoice for revenue code 0278, and the units on it have to match the units billed. For implants bought in bulk, the invoice has to note the units that apply to the claim. Either miss denies the line “unless otherwise agreed upon.” The policy also does not pay for implants that were opened but not implanted, including items opened by mistake or set aside when the surgeon changes course.
• Texas requires a signed certification that the amount billed is actual cost, net of rebates and discounts, in fixed words: “I hereby certify under penalty of law that the following is the true and correct actual cost to the best of my knowledge.” The signer has to have “personal knowledge of the cost of the implantable and any rebates or discounts to which the facility or surgical implant provider may be entitled.” The carrier can audit it.

That Texas requirement names the seam this site keeps returning to. The person with personal knowledge of an implant’s cost and its rebates usually works in materials or accounts payable. The claim is built in billing. Texas makes the claim carry what the invoice side of the building knows.

What to settle in writing

Each item below comes from a section above. None has a universal answer, and wherever the contract leaves one open, the payer’s policy fills it.

1. What counts as an implant. A named standard, a list or a revenue code, and where absorbable devices and temporary fixation fall.
2. Shipping. Part of cost, added after the markup, or excluded.
3. Sales tax. Part of cost or not.
4. Rebates and discounts. Gross or net, and whether that means what is on the invoice or what is settled later.
5. The markup. The percentage, and any cap per item or per case.
6. The threshold. Per device or per case, and measured on cost or on billed charge.
7. The procedure rate. Whether separate implant payment changes it.
8. Proof. Which document, how units are shown, how bulk purchases are handled, and when an invoice has to go with the claim.

Where Bill-Back fits

Every term above decides what an implant claim pays. None of them helps with an implant that never reached a claim.

That is the part Bill-Back works on, for commercial payers only. It reads three documents a center already has: the monthly case log export from the PMS, the vendor invoice PDFs, and the charge entry report. It matches each supply note to its invoice line and prices it at the contracted rate. Someone on the center’s side clears anything already on a claim, and what is left becomes a payer-ready Recoup Packet, with the matched invoice line and the contract math, for the center’s own biller to submit. Free to audit, and you only pay when the payer pays.

You can estimate what that is worth at your case volume in about thirty seconds, or start a free audit against a month of your own files.

Sources

Every rule and figure above traces to one of these. Each was read in full at the source.

Government and regulatory

• Payment Policy for Ambulatory Surgery Center Services in the Facility, OWCP Medical Fee Schedule, U.S. Department of Labor (effective July 9, 2023, updated April 1, 2024). Implant and acquisition cost sections.
• Ill. Admin. Code tit. 50, section 9110.90, Illinois Workers’ Compensation Commission Medical Fee Schedule, via Cornell LII.
• Medical fee schedule FAQ, Illinois Workers’ Compensation Commission. “How are implants/carve-outs paid?”
• 28 Tex. Admin. Code section 134.402, Ambulatory Surgical Center Fee Guideline, via Cornell LII.
• Ambulatory surgical center fee guideline FAQ, Texas Department of Insurance, Division of Workers’ Compensation (updated February 10, 2025). Questions 5 and 6.
• Ambulatory Surgical Center Fee Guidelines, 28 TAC section 134.402, Texas Division of Workers’ Compensation training presentation. Scenarios 2 and 3.
• 21 CFR 860.3, Definitions, via eCFR. The definition of “implant.”
• July 2026 ASC Approved HCPCS Code and Payment Rates, CMS. Addendum BB, code C1741.

Payer reimbursement policies

• Device, Implant, and Skin Substitute Policy, Facility, UnitedHealthcare Commercial and Individual Exchange reimbursement policy 2026R5019F.
• Implant, Device, and Tissue Policy, RP007, Blue Cross and Blue Shield of New Mexico (effective August 28, 2026).
• Ambulatory Surgery Center Reimbursement Guidelines, Blue Cross Blue Shield of Wyoming Provider Highlights, June 2010.