What is underpayment in medical billing?

Financial metrics

What is Underpayment?

Also called: payer underpayment · contract variance

An underpayment is a claim paid below the contracted allowed amount. Unlike a denial it produces no alert, posts cleanly, and closes the claim — which is why systematic underpayment can run for years without anyone noticing. Detection requires comparing every payment against a loaded fee schedule.

Common causes are fee schedule updates the payer applied late or not at all, incorrect multiple-procedure reductions, and modifier-based reductions applied where the contract does not permit them.

The recovery route is the contract, not the appeal process — you are asserting a payment variance, not disputing an adjudication decision, and payers generally have a defined variance process for it.

Where Vizora handles this

Practice analytics

Primary sources

Where "Underpayment" is defined by the bodies that set the rules, rather than by us.

Medicare Physician Fee Schedule lookup (opens in a new tab)
Centers for Medicare & Medicaid Services — Official allowed amounts by CPT/HCPCS code and locality. The reference point most commercial contracts are written against as a percentage.
MGMA DataDive and MGMA Stat (opens in a new tab)
Medical Group Management Association — The practice-level operations benchmarks — days in AR, denial rate, cost to collect — that physician groups are actually measured against.

Last reviewed August 20, 2026

Related terms

Contractual Adjustment

A contractual adjustment is the difference between a provider's billed charge and the contracted allowed amount with that payer. It is not a loss and not collectible from the patient — it is the discount agreed to in the contract, and it must be recorded separately from write-offs.

Allowed Amount

The allowed amount is the maximum a payer recognizes for a covered service under its contract with the provider. It sets the ceiling on total payment — payer portion plus patient responsibility — and the difference between billed charge and allowed amount becomes a contractual adjustment.

Net Collection Rate

Net collection rate is payments received divided by the amount you were contractually entitled to collect, after removing contractual adjustments. It answers the question gross collection rate cannot: of the money you actually had a right to, how much did you get?

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