What is Underpayment (payment variance)?
A claim the payer paid, but paid below the contracted allowed amount — a denial that never announces itself.
Definition
An underpayment happens when the allowed amount on the remittance is less than the rate in your contract for that code. Nothing denies, nothing rejects, and the claim closes as paid. The only way to detect it is to compare every allowed amount against the contracted rate, line by line.
Causes are usually systemic rather than one-off: a fee schedule the payer never loaded after a contract renewal, incorrect multiple-procedure ranking, out-of-network pricing applied to an in-network provider. Because the cause is systemic, the same underpayment repeats across every affected claim until someone notices.
Why it matters
Underpayments are invisible to any workflow organised around denials, which means they can run unchecked for years. They are the highest-yield thing to look for the first time a practice loads its contracts.
Denial codes to know
Related terms
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