The notify list isn't the shortage list

A product code can sit at the center of an actual national device shortage and a search across FDA’s 510(k), enforcement, warning-letter, and Federal Register records will not surface the word. That is not a gap in any one of those four records. It is a fifth and sixth category, and they are not the same list as each other either.

The list of who has to talk

The CARES Act, signed March 27, 2020, added Section 506J to the FD&C Act: an obligation on manufacturers of certain devices to notify FDA, in advance of or during a declared public health emergency, of a permanent discontinuance or an interruption likely to cause a meaningful supply disruption. Which manufacturers that reaches was left to a separate list — one Congress ordered built two and a half years later, in Section 2514(c) of the Consolidated Appropriations Act, 2023, and one FDA finished implementing with guidance finalized January 7, 2025. The result is the 506J Device List: roughly 285 product codes, from airway connectors to wound dressings, each one obligating its manufacturer to notify FDA of a qualifying interruption. A code on this list carries a duty. It does not carry a fact.

The list of what’s actually short

Section 506J separately directs FDA to keep a public, up-to-date list of devices it has determined are actually in shortage — the Medical Device Shortages List. A code lands there only after FDA concludes demand for it in the United States exceeds supply, and comes off again only when FDA concludes it no longer does. That is a determination, made and revisited on FDA’s own timetable, not a standing registry of who might someday have to report something.

One list says a manufacturer has to tell FDA if something goes wrong. The other says FDA already looked, and something has.

Two lists, and not even the same codes

The gap runs in both directions. FDA’s own account of recent years is direct on the point: several of the more significant device shortages involved products that were never on the 506J Device List at all, surfaced instead through voluntary reports from manufacturers, hospitals, distributors, and group purchasing organizations that owed FDA no notification under the statute. A code’s absence from the obligation list is not evidence its supply is fine, and a code’s presence on it is not evidence its supply is not.

The practice

Watching a portfolio’s product codes for a supply problem means checking two FDA pages, not one, and not confusing which question each one answers. The 506J Device List answers “does a manufacturer of this code owe FDA a warning if something interrupts” — useful for knowing whose voice would be the first one heard, not for knowing whether anything currently has. The Medical Device Shortages List answers “has FDA already concluded this code is short” — the closer thing to the question a supply-risk review is usually actually asking, and the one no product-code search of a recall, clearance, or warning-letter record will ever surface on its own.

Neither list sits behind an API FDA Radar or any comparable monitor reads — both are pages FDA maintains and updates directly, outside the four sources this product ingests on a schedule. Whether a specific shortage or a specific manufacturer’s notification duty changes how a portfolio should respond is, as with the rest of this record, a judgment for the regulatory or supply-chain professional holding the file — this is regulatory intelligence about what two government lists each certify, never regulatory advice about a specific product code.