How To · 6 min read
Clinical cost is lab plus supplies as one number, and a healthy dental practice runs it at 10% to 14% of net production. It is the more honest read, because it does not punish you for milling crowns in house.
Supply cost and lab cost each get their own benchmark, and both are worth watching. But looking at them one at a time can point you at a problem that does not exist, because the two trade off against each other. Combine them into a single clinical cost percentage and that distortion disappears.
Clinical cost is what it takes to physically produce the dentistry: the materials your team uses at the chair, plus the outside lab work you send out. Every case has to be made somewhere. The only real question is whether it is made in your building or somebody else's, and that choice moves cost between two accounts without changing how much dentistry costs you to deliver.
That is exactly where a single-metric read goes wrong. Consider two practices, each producing $1 million a year:
Practice A sends everything out. Clinical supplies of $60,000, or 6% of net production. Outside lab of $65,000, or 6.5%. Both sit inside the healthy band and nothing looks unusual.
Practice B mills crowns in house. Clinical supplies of $95,000, or 9.5% of net production, because milling blocks, burs, and materials all land in supplies. Outside lab of $20,000, or 2%.
Look only at supply cost percentage and Practice B appears to have a serious purchasing problem, running well above the 5% to 7% range. Owners in that position go hunting: renegotiate with the supplier, tighten the ordering process, sometimes lean on the team about waste. Now combine the two.
Practice A runs $125,000 of clinical cost on $1 million of net production, or 12.5%. Practice B runs $115,000, or 11.5%. Practice B is not overspending. It is the cheaper of the two, and the capital equipment it bought is doing exactly what it was supposed to do. The supply percentage was never the problem. It was the wrong lens.
Clinical supplies run 5% to 7% of net production in a healthy dental practice, and outside lab runs another 5% to 7%. Those are the ranges dental accounting specialists benchmark a general practice against, from the 2024 ADCPA/NSCHBC Benchmark Report, the annual income and expense survey the Academy of Dental CPAs runs jointly with the National Society of Certified Healthcare Business Consultants. Added together, that puts combined clinical cost between 10% and 14% of net production.
Inside that band, read it this way. Under 11% is a strong number. It means both components are running below their midpoints, or you have made in-house production genuinely pay. Between 11% and 14% is normal and not worth a project. Above 14% is where you go looking, and the cause is usually one of three things: real price creep from a lab or supplier, a case mix that shifted toward high-material procedures, or a chart of accounts that is letting the wrong expenses into the wrong buckets.
One honest exception at the top of that band. Lab is the case-mix-sensitive half of this number, so a practice with heavy crown and bridge, implant, or clear aligner volume can run above 14% on lab alone and be entirely healthy. The question there is not whether you clear a range built on a general-practice mix. It is whether that lab spend is buying production you are charging appropriately for.
You can check clinical cost alongside your overhead, staffing, and collection ratios in about two minutes with our free Dental Practice Benchmark Scorecard.
Add your clinical supply spend and your outside lab spend for a period, divide by net production for the same period, and multiply by 100. Three details decide whether the answer means anything.
Use net production as the denominator. Net production is the value of the dentistry you did after contractual insurance write-offs. Do not use collections, which move with payment timing and make the ratio bounce for reasons that have nothing to do with cost. Do not use gross production either, because it still contains write-offs you were never going to collect, which makes every ratio look better than it is.
Match the periods. Cost and production have to cover the same window. A bulk order in one month against that month's production produces a number that means nothing. Run it on a trailing three or twelve month basis and the noise drops out.
Keep office supplies out of it. Front desk paper, cleaning products, and coffee are not clinical supplies. They belong in office expense. If they are sitting in your clinical supply account, your clinical cost is overstated and you will go chasing a problem in the operatory that actually lives in the supply closet.
The combined number tells you whether you have a problem. The split tells you where it is. Break it apart in three situations.
When clinical cost is above 14%. Now the components matter. If lab is driving it, look at your lab's price increases, your case mix, and whether remakes are being absorbed quietly. If supplies are driving it, look at ordering discipline, duplicate buying, and rush shipping.
When either component moves sharply while the total holds steady. This is the interesting one, because it almost always means something got miscoded rather than something got more expensive. Money moved between two accounts and never left the building. The most common version of this is clear aligner case fees landing in supplies instead of lab, which inflates one number and hides the other while the total sits perfectly still.
When you change how cases get produced. Bringing milling in house, adding a scanner, or switching to a different lab all shift cost between the two accounts on purpose. Watch the combined number to see whether the change actually paid, and expect the split to look different afterward.
P.S. Reciprocity Accounting keeps lab and supply coded correctly every month, so your clinical cost percentage reflects your dentistry instead of your bookkeeping. See how we can help your practice.
Between 10% and 14% of net production, which is the sum of a healthy 5% to 7% supply cost and a healthy 5% to 7% lab cost. Under 11% is strong. Above 14% is worth investigating, starting with whether the expenses are coded correctly before you assume prices went up.
Net production, the value of the dentistry you did after contractual write-offs. Collections move with insurance payment timing, so a ratio built on them changes for reasons unrelated to cost. Net production is also the base your collection ratio uses, so all of your ratios line up on the same denominator.
Often not. That pattern is the signature of in-house production, such as milling your own crowns, and it is what the economics are supposed to look like when the equipment is being used. Add the two together before you react. If the combined number is inside 10% to 14%, the equipment is doing its job. If the combined number is fine but the split moved suddenly without any change in how you produce cases, suspect a coding error instead.
The test is whether the item is made for one identified patient to a prescription, or pulled from stock and used on anyone. A custom abutment or a clear aligner case is fabricated for a specific patient, so it is a lab fee. A stock abutment, composite, and burs are inventory, so they are supplies. Either way both land inside clinical cost, which is one more reason the combined number is harder to get wrong.
Monthly, on a trailing basis, alongside your other practice KPIs. A single month swings with bulk orders and lab billing timing. A trailing three or twelve month view shows you the trend, which is the part you can actually act on.