A national payer publishes state-specific changes, and that breaks state filters

Filtering payer changes by state looks like a simple question with a simple answer. In practice it has two distinct sub-questions, and conflating them causes most of the confusion.

The first is where a payer operates. The second is which market a particular notice applies to. A national payer answers the first with every state and the second differently on every notice.

Three shapes of notice from one payer

A payer that operates nationally publishes at least three kinds of change:

• Genuinely national policy that applies everywhere the payer does business
• Market-specific notices that apply to one state, often distinguished only by a line in the body
• Plan-line notices where the state is implicit, because the plan only exists in certain markets

A filter keyed on an explicit state tag catches the second group and, depending on how it is built, either includes or excludes the first.

Both failure modes are bad in different ways

If national policy is treated as belonging to no state, it disappears from every state view. A team watching one market sees only market-specific notices and misses the national policy that also governs them.

If a market-specific notice is treated as national because its state was never tagged, it appears in every state view. A team in one state reads about a change that does not apply to them, and the signal-to-noise ratio of the whole view degrades.

The first failure is quiet. The second is loud. Quiet failures last longer.

Regional payers invert the problem

A payer operating in a defined set of states has the opposite characteristic. Its footprint is the answer, and per-notice state tags add little. Treating a regional payer's untagged notice as national puts it in front of everyone, including markets where that payer has no members at all.

So the correct treatment depends on which kind of payer published the notice, which means a state filter is really two rules wearing one label.

The practical read

State is a property of a notice sometimes and a property of a payer other times. Any view that collapses those into one field will be wrong in one direction, and the direction it fails in determines whether anyone notices.