This page mirrors the rule set the CMS-1500 cross-check engine evaluates every filing against — every Box, every citation, and the change-log summary behind the current version. Use it before you trust a cross-check report: if the rule version on this page does not match the one cited at the top of a filing, the engine and the report are out of step.
Citations back every check — the column on the right is what a reviewer cites when they push back on a flag.