The allowed amount is the number a claim actually prices against. A provider’s billed charge is a starting point, not a price — what the plan pays, what the member owes, and what the provider has to write off are all calculated from the allowed amount, never from the billed charge directly. Get this one number wrong at adjudication and every figure downstream of it — plan payment, member responsibility, the EOB line items — is wrong too.
Where the number comes from
The allowed amount isn’t set by the provider and isn’t looked up from a single universal table. It comes from whichever pricing source applies to that specific claim:
- A fee schedule, when the provider has a contracted or plan-defined rate on file for that procedure code. This is the first place adjudication looks, and when it matches, that contracted rate is the allowed amount.
- A usual-and-customary (U&C) benchmark, when no fee schedule applies — typically an out-of-network provider or a code outside any contract. The plan falls back to a percentile of what’s typically charged for that code in that geography. See usual and customary for how that percentile gets derived.
- A negotiated one-off rate, when neither of the above exists and the plan negotiates a specific price with an out-of-network provider for a single case. See single case agreement for how that works.
- A reference-based pricing benchmark, when the plan prices claims off a public benchmark — most often a percentage of Medicare — instead of a negotiated network contract. See reference-based pricing for why that’s a structurally different pricing source, not just a different rate on the same kind of table.
Whichever source applies, the output is the same kind of number: a plan-recognized price for that service, on that claim, that’s frequently lower than what was billed.
A worked example
A provider bills CPT 99215 (a higher-complexity office visit) at $280. Three different pricing scenarios for the identical billed charge:
| Scenario | Pricing source | Allowed amount | Gap from billed |
|---|---|---|---|
| In-network, contracted rate on file | Fee schedule | $165 | $115 write-off, member not billed |
| Out-of-network, no contract | Usual and customary (80th percentile) | $210 | $70 gap — possible balance billing |
| Out-of-network, plan negotiates a one-time rate | Single case agreement | $230 | $50 gap, terms set by the SCA |
Same code, same billed charge, three different allowed amounts — because the allowed amount is a function of which pricing source governs the claim, not a property of the service itself. Cost-sharing (deductible, coinsurance, copay) applies against whichever allowed amount actually governed that claim, never against the $280 billed figure.
Why the gap matters
What happens to the difference between billed and allowed depends entirely on whether a network agreement covers that gap. When a contracted provider agrees to a fee schedule rate, the gap becomes a write-off the provider absorbs as a condition of network participation — the member never sees it. When there’s no contract, that gap is where balance billing risk lives: absent a network agreement or a specific legal protection, the provider can bill the member directly for the difference between what they charged and what the plan allowed.
Why this matters operationally
The allowed amount is upstream of nearly every other figure a claims platform produces — it’s what an EOB shows as the plan’s recognized rate, what coordination of benefits coordinates against when a member has dual coverage, and what a fee schedule exists to set in advance. A claims adjudication engine that resolves the correct allowed amount at pricing time — checking fee schedule first, falling back to U&C, applying an SCA when one exists — is what keeps every downstream calculation consistent and auditable, rather than reconstructing “what should this have priced at” after a member or provider disputes the EOB.