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A supplier invoice has three parts: the header (who, when, and on what terms), the line items (what you bought, in what unit, at what price), and the footer (everything added on top). The hidden fees in medical supply invoices are almost never truly hidden. They sit in the footer, in the unit of measure, or in the payment terms, where nobody checks them. To see what you really pay, turn every invoice into a delivered cost per usable unit.
Here is how to read each part, which charges to question, and a checklist you can use on your next invoice.
What should the invoice header tell you?
The header sets the rules for everything below it. Check:
- Supplier legal name and address. It should match the supplier you verified and set up. An unfamiliar entity name on an invoice for prescription products deserves a question.
- Bill-to and ship-to. Especially for multi-location practices, confirm the order went to the right site and account.
- Your PO or order reference. If your practice uses purchase approvals, every invoice should trace back to an approved order.
- Payment terms. "Due on receipt", "Net 30" and early-payment discounts change what the order really costs. More on this below.
- Price basis. Some suppliers bill at the price in effect on the ship date, not the order date. On a backordered item, that can mean a higher price than you were quoted.
What should every line item tell you?
Each line should let you identify exactly what you received and compare it with another offer. Look for:
| Field | Why it matters |
|---|---|
| Product name and strength | Confirms the exact product, e.g. vial size or syringe volume |
| Identifier | NDC for drugs, or manufacturer part number or GTIN for devices and supplies |
| Unit of measure | Each, box, case. The single most common source of apparent price changes |
| Pack size | How many usable units are in one unit of measure |
| Quantity | Ordered versus shipped versus backordered |
| Unit and extended price | Unit price × quantity should equal the extended price |
| Lot and expiry | Often on the packing slip rather than the invoice. Needed for recalls and stock rotation |
The unit-of-measure trap. A glove price of $9.50 might be per box of 100 on one invoice and $85 per case of 10 boxes on another. That is $0.095 versus $0.085 per glove. Always convert to the smallest usable unit before comparing.
Which fees and surcharges commonly appear?
Most extra charges fall into a handful of categories. Some are pass-through costs you cannot avoid. Many are negotiable or avoidable.
| Charge | What it is | Often avoidable or negotiable? |
|---|---|---|
| Shipping and handling | Carrier cost plus the supplier's packing charge | Often, via order consolidation or free-freight thresholds |
| Cold-chain packaging | Insulated shippers, gel packs, dry ice for temperature-sensitive products | Sometimes, by consolidating cold items into fewer shipments |
| Dry-ice surcharge | Carrier fee for shipments packed with dry ice | Rarely, if the product needs it |
| Fuel surcharge | Carrier percentage charge tied to published fuel prices | Rarely; smaller when base freight is lower |
| Small-order or minimum fee | Charge when an order falls below a dollar or quantity threshold | Yes, by planning reorders |
| Split-shipment freight | Separate freight for backordered items that ship later | Yes, ask for backorders to ship free or with the next order |
| Credit card surcharge | Fee for paying by credit card | Sometimes, by paying by ACH or check |
| Restocking fee | Charge for accepting a return | Negotiate before you order, not after |
| Late fee or finance charge | Charge for paying after the due date | Yes, with an approval and payment calendar |
| Sales tax | Varies by state and by product type | No, but confirm it is applied correctly |
A few of these deserve a closer look.
Fuel surcharges are set by carriers, not suppliers. FedEx, for example, bases its fuel surcharges on weekly published fuel price averages, adjusts them weekly, and applies them as a percentage to the package rate plus certain other surcharges. If a supplier passes carrier charges through, the fuel line will move from week to week even when you order the same thing.
Dry ice is regulated as a dangerous good when shipped by air, and packages must be marked "UN 1845" along with "Dry ice" or "carbon dioxide, solid". FedEx lists a separate dry-ice surcharge for shipments without other dangerous goods. When cold-chain products ship, some of this cost is legitimate. It is still worth consolidating cold items so you pay it less often. For what the product labels actually require, see our post on cold-chain storage for injectables.
Credit card surcharges are governed by card network rules and state law. Visa's U.S. rules cap a credit card surcharge at the lower of the merchant's discount rate or 3%, do not allow surcharges on Visa debit or prepaid cards, and require the surcharge to be disclosed, including as a separate charge on the receipt. Several states restrict surcharging further. If you see a card surcharge on a debit card payment, ask about it.
How do you calculate delivered cost per unit?
Delivered cost is the only fair way to compare suppliers. Here is a worked example with hypothetical numbers.
Hypothetical invoice:
- Line A: 2 boxes of syringes at $24 each = $48
- Line B: 4 vials of a refrigerated injectable at $300 each = $1,200
- Shipping and handling: $25
- Cold-pack packaging: $15
- Fuel surcharge: $6
- Subtotal of order-level charges: $46
Step 1: allocate order-level charges by value. Line B is $1,200 of $1,248 in goods, about 96%. Cold-pack packaging applies only to Line B, so assign it there directly. Split the remaining $31 by value: about $1.19 to Line A and $29.81 to Line B.
Step 2: calculate delivered cost per unit.
- Line A: ($48 + $1.19) ÷ 2 boxes = $24.60 per box
- Line B: ($1,200 + $15 + $29.81) ÷ 4 vials = $311.20 per vial
That vial costs you about 3.7% more than its list price. If a competing offer lists the same vial at $305 with free cold-chain shipping, it is the better deal, even though the list price difference looks small.
What are the red flags on a supplier invoice?
Watch for these patterns:
- Quantity shipped differs from quantity billed. Always reconcile against the packing slip.
- Unit of measure changed between orders without explanation.
- Backorders shipped separately with freight on each shipment.
- A price increase with no notice, or a promotional price that silently expired.
- Card surcharge on a debit payment, or a surcharge that was never disclosed.
- Charges with vague names such as "service fee" or "admin fee". Ask what they cover.
- An unfamiliar seller name on prescription products. The FDA states that federal law requires health care providers who dispense or administer prescription drugs to purchase them only from authorized sources. See our guide on spotting counterfeit toxins and fillers.
How do payment terms change what you pay?
Payment terms are part of the price. "Net 30" means payment is due 30 days after the invoice date. Some suppliers offer an early-payment discount, for example a small percentage off if you pay within 10 days. Others add finance charges after the due date. When comparing two offers, note the terms: a slightly higher price on Net 30 can be better for cash flow than a lower price due on receipt, and a missed early-payment discount is money left on the table.
On Pink Kiwi, eligible practices can apply for Net-30 terms.
Your supplier invoice checklist
Use this on every invoice before approving payment:
- Supplier name matches a verified vendor on your approved list.
- Invoice ties to an approved PO or order.
- Every line has a product identifier, unit of measure and pack size.
- Quantity billed equals quantity received on the packing slip.
- Unit price matches the quote or your last price, in the same unit of measure.
- Every order-level charge is identified, and you know whether it was avoidable.
- Card surcharges, if any, are disclosed and apply only to credit cards.
- Payment terms and any early-payment discount are noted on your calendar.
- Lot numbers and expiry dates for regulated items are recorded at receiving.
- Delivered cost per unit is logged for your top items so you can spot drift.
For the bigger picture on where these charges add up, read where medspa supply spend leaks, and for setting up approvals that catch invoice problems before payment, see purchasing approvals and monthly budgets.
Where does Pink Kiwi fit?
Pink Kiwi shows offers from verified suppliers side by side, so you can compare the same product before you order and check out along the cheapest route. The simplest way to see what your current invoices are costing you is a free savings analysis: upload an invoice (PDF, photo, CSV or spreadsheet), review the extracted lines, and we show exactly where you would save. If we cannot find savings, we tell you. You can also browse the catalog or read the medspa supply buying guide.
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About the author
Pink Kiwi Editorial Team
The Pink Kiwi editorial team researches and writes practical buying, compliance, and operations guidance for aesthetic practices, citing manufacturer labeling, regulators, and other primary sources.