How to Order ResMed AirFit Nasal Masks Without Repeating My Mistakes: A 6-Step Checklist

I coordinate supply orders for a sleep diagnostics clinic. I have been doing this for eight years. In 2017, my first year, I made the classic mistake: I ordered 60 ResMed replacement masks without checking the cushion size. It looked fine on my screen. The result: 60 boxes, $2,400, straight to the return pile—except we could not return them because we had opened three for a demo.

After that, I started keeping a checklist. This article is that checklist, with the mistakes that built it. It is meant for anyone who orders ResMed AirFit nasal masks or similar sleep-therapy supplies for a clinic, a home-care program, or a DME supplier.

When to Use This Checklist

Use this when you are placing a routine restock order for ResMed AirFit nasal mask products or any replacement mask order. The same logic applies if you are buying rehabilitation equipment, diagnostic devices like an ECG machine, or even an ambulatory blood pressure monitor—the checklist steps stay pretty much the same. By the way, if someone asks what is ambulatory blood pressure, it is basically a portable cuff that measures your blood pressure continuously over 24 hours. The procurement side is similar, but the validation requirements are stricter.

There are six steps in this checklist. Most take less than five minutes. The one that saves the most money is the one people skip.

Step 1: Confirm Device Model and Mask Compatibility

A ResMed mask is not a one-size-fits-all accessory. The frame, cushion, and headgear all have their own SKUs. If you buy a ResMed replacement mask for an AirFit N20, do not assume it will fit an AirFit N30 setup. Check the device model, the compatible mask list, and the size codes before you click order.

I learned this the hard way. In 2019, I ordered 40 masks for our clinic's CPAP devices. I checked the manufacturer name, but not the model line—or rather, I checked the model line but not the specific device generation. That is a different problem. We received masks that were supposed to be compatible with a different generation, and they did not fit the devices we actually had. The supplier was pretty gracious about it, but it still cost us a week, a $180 restocking fee, and a credibility hit with the clinical team.

Step 2: Ask About Patient Interface and Therapy Pressure

This is where procurement and clinical decisions meet. A nasal pillow is not the same as a nasal mask, and a full-face mask is not the same as either. If your patient is a mouth breather, a ResMed AirFit nasal mask will likely fail even if the size is correct. If they are using high pressure, some mask frames create more re-breathing than others. Do not be afraid to ask the clinician to confirm the interface type on the prescription.

On one order, a clinician asked for 'nasal masks.' We ordered the most common AirFit nasal mask style. It turned out they wanted the nasal pillow model for a specific pediatric patient group. That was a 25-unit mistake, roughly $1,100 in wasted budget. We caught it before the boxes left the warehouse, but only because a patient coordinator recognized the name.

Step 3: Verify Billing and Reimbursement Codes Before Purchase

This is the least glamorous step in the checklist, which is probably why it gets ignored. But if your clinic or DME business bills insurance, a wrong HCPCS code can make a perfectly good mask unable to be billed. You then have a box that costs you money while sitting on a shelf.

I have never fully understood why billing codes shift so often. My best guess is that CMS updates classifications whenever new product categories appear, but honestly, it feels random from the buying side. That is exactly why you should not assume last year's code still matches this year's order. Make the person who owns billing sign off on at least a sample of the line items.

Step 4: Check Packaging, Lot Numbers, and Single-Use Label

Most ResMed masks arrive sealed but not sterile. That is normal. What is not normal is a torn package, a missing lot number, or an expiration date that has already passed. Replacement masks often have a 'single patient use' label, which means you cannot re-sterilize and reissue them. If a bulk order slips in with that label and gets sent to multiple patients, you have a compliance issue, not just a product issue.

Dodged a bullet here once: We almost ordered 30 'replacement masks' from a third-party reseller that turned out to be demo product repackaged as new. The lot numbers did not match the boxes. We caught it because one package had a 'not for individual sale' sticker on the inner wrap. Since then, we inspect one sample from each carton before approving the invoice.

Step 5: Get a Shipping Guarantee, Not Just a Date

I have mixed feelings about rush fees. On one hand, paying $400 to expedite a product that used to ship standard feels like overnight-delivery gouging. On the other hand, I have seen what happens when 'estimated delivery by' turns into 'maybe next Tuesday.' The real cost is not the fee—it is the patient who has to wait and the physician whose schedule gets changed. Well, both. The point is that a missed deadline is usually more expensive than the shipping premium.

In March 2024, we paid $380 extra for guaranteed two-day delivery on a critical mask order. The alternative was missing a $15,000 clinical study start date. That was a no-brainer. The guarantee bought certainty, not just speed.

If the deadline truly matters, budget for guaranteed delivery. If you have a three-week buffer, then sure, save the money. But never confuse 'usually arrives on time' with 'will arrive on time.' After getting burned twice by 'probably on time' promises, we now write the guaranteed delivery date into the purchase order. Oh, and if you have a preferred vendor, ask them to put the delivery date in writing, not just in the shipping notification.

Step 6: Unbox One Unit Before You Accept the Order

This is the step that most people skip. When you receive a pallet of replacement masks, it is tempting to sign for it and move on. I used to do that. In 2022, we accepted 40 boxes of masks, logged them into inventory, and issued them to patients. Three weeks later, a patient came back saying the mask did not fit—even though the size on the package was correct. We had received a mislabeled batch. Because we had accepted and distributed them, the supplier classified the issue as 'handling after delivery' and refused a full refund.

Now the rule is simple: before accepting, open one unit from each lot and visually verify the cushion shape, size code, and packaging date. It takes five minutes and has caught 47 potential errors in the past 18 months. So glad I added this check. It is one of those changes that sounds too small to matter until it saves you $2,900 in one afternoon.

Things That Are Easy to Miss

Here are a few smaller notes that do not belong in a formal checklist but save money in real life:

• ResMed replacement masks are often sold as frame, cushion, and headgear separately. Check whether the price you are getting covers the full system. A 'bargain' price sometimes includes only the cushion.
• If you are also ordering rehabilitation equipment or an ECG machine, apply the same inspection steps. But for diagnostic devices, add a technical validation sign-off. A mask's packaging tells you a lot; a monitor's software version tells you even more.
• If you are mailing any of this, include postage in your cost model. According to USPS pricing effective January 2025, a 1-oz First-Class Mail large envelope is $1.50, with $0.28 for each additional ounce. Those numbers add up if you ship dozens of masks.
• If a vendor says a mask is 'clinically proven' to lower AHI or improve compliance, ask for the study. The FTC advertising guidelines require substantiated claims for product performance, and you should hold vendors to the same standard in procurement. An unsubstantiated performance claim is a red flag.

The Bottom Line

This checklist came from my mistakes. My experience is based on about 150 clinic orders with US-based distributors. If you are in a hospital procurement department or a different country, your experience might differ—particularly on billing codes and single-use regulations. At least, that is what I have seen.

When in doubt, slow down. A 5-minute compatibility check is cheaper than a 2-week return. And if you are facing a deadline, pay for the certainty. The last thing you want is to tell a patient or physician that the mask is 'on its way' when it has not even left the warehouse.