Direct comparison
Alternating Pressure vs Low Air Loss Mattress
Alternating pressure vs low air loss mattress: FDA classes one, Medicare codes both as E0277, plus the 5-inch cell rule. Not medical advice.
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How do Alternating pressure mattress, Low air loss mattress compare side by side?
The table below compares Alternating pressure mattress, Low air loss mattress across 11 procurement-relevant dimensions, from plain-language description through source.
Side-by-side comparison
| Dimension | Alternating pressure mattress | Low air loss mattress |
|---|---|---|
| Plain-language description | A mattress with multiple air cells that a control unit fills and empties in an alternating pattern, giving regular, frequent, automatic changes in the distribution of body pressure (wording of 21 CFR 880.5550). | No definition in 21 CFR 880.5550. Medicare lists low air loss beside alternating pressure as a type of powered pressure reducing mattress; suppliers describe it as an air-cell surface with continuous airflow. |
| FDA identification | Named and defined in 21 CFR 880.5550 as an "alternating pressure air flotation mattress." | That regulation does not mention low air loss, so it has no separate identification there. |
| FDA classification | Class II (special controls); exempt from premarket notification (510(k)) procedures, subject to 21 CFR 880.9. | Not addressed by 21 CFR 880.5550. |
| Intended use in the FDA definition | The regulation states the device is used to prevent and treat decubitus ulcers (bed sores). | Not addressed by that regulation. |
| Medicare code for a powered mattress | HCPCS E0277: "a powered pressure reducing mattress (alternating pressure, low air loss, or powered flotation without low air loss)." | Same code, E0277. Policy Article A52490 states that either alternating pressure or low air loss mattresses are coded using E0277. |
| Medicare powered overlays (Group 1) | Article A52489 covers "powered pressure reducing mattress overlay systems (alternating pressure or low air loss)" under codes including E0181 and E0182 (with A4640), and requires a pump or blower providing sequential inflation and deflation of air cells. | Included in the same overlay category; the article accepts, alternatively, a low interface pressure throughout the overlay in place of sequential inflation and deflation. |
| Medicare mattress-replacement characteristics (Group 2) | For E0277: inflated air-cell height of 5 inches or greater, a surface designed to reduce friction and shear, and placement directly on a hospital bed frame. | The same characteristics apply, because both types fall under E0277. |
| Bottoming-out check in the coverage policy | LCD L33642 defines bottoming out as the point where an outstretched hand can readily palpate the bony prominence beneath the mattress or overlay. | The same definition applies to the surface whichever type it is. |
| Medicare Group 2 coverage conditions (US payer rule, not clinical advice) | Covered where, for example, there are multiple stage 2 pressure ulcers on the trunk or pelvis that failed to improve over the past month on a comprehensive program that included a Group 1 surface; large or multiple stage 3 or 4 ulcers on the trunk or pelvis; or a recent myocutaneous flap or skin graft (generally limited to 60 days from surgery). | Identical conditions; the coverage policy does not use the alternating pressure or low air loss label to separate them. |
| When to pick each | Pick between them with the treating clinician, not by label alone: the FDA and Medicare documents above define the surface by category (powered or nonpowered, overlay or replacement, cell height, friction and shear features) rather than by the name. | The same applies. A supplier's product can combine features, so check the product's own instructions for use and the order or coverage rules that apply to your setting. |
| Source | 21 CFR 880.5550 (eCFR/Cornell LII, read 2026-10-30); CMS Medicare Coverage Database Policy Article A52490 (read 2026-10-30); CMS Policy Article A52489 (read 2026-10-30); CMS LCD L33642 (read 2026-10-30). URLs: ecfr.gov/current/title-21/part-880/section-880.5550; cms.gov/medicare-coverage-database (articleid=52490, 52489; lcdid=33642). | Same sources. Regulatory and Medicare statements are attributed and dated; supplier descriptions are not primary sources. |
Common questions
Common questions about Alternating pressure mattress vs Low air loss mattress
What is an airflow mattress?
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It is a common name for a powered air-cell mattress, not a term defined by FDA or Medicare. Their documents use "alternating pressure air flotation mattress" (21 CFR 880.5550) and "powered pressure reducing mattress" (E0277, which lists alternating pressure, low air loss and powered flotation without low air loss). Suppliers use "airflow" mainly for surfaces that move air through the cells. General information, not medical advice.
Going deeper
