Most practices discover a directory problem when claims start denying with reason codes that reference network status or provider enrollment — not a letter, not a warning, just a denial queue that takes weeks to trace back to a lapsed attestation or a silent payer drop.
Payer directories are maintained by the payer, not by the provider. When a payer's internal processes generate a status change — a network termination, an address mismatch, a failed auto-renewal — the provider is often the last to know. CAQH attestation lapses are the most common trigger: most commercial payers pull credentialing data from CAQH, and a lapsed attestation can cascade across eight payers at once.