How to compare a commercial rate with Medicare

Make the reference reproducible

CMS publishes physician fee schedule files and describes geographic adjustment through RVU components and locality indices. The PFS documentation explains why one code does not imply a single universal dollar amount.

An audit note should name the source file, version, service date, locality, setting and component—not just say “110% of Medicare.” Avoid quietly using the current file for a contract that fixes an older reference year.

Match the reference, not just the percentage

Two reference files can describe the same service but use different settings, components or payment bases. Record the complete reference required by the agreement. A public guide cannot decide which one the parties agreed to use.

Use the Medicare reference tool to see the supported inputs and source information. Do not choose a classification merely because it produces the larger amount. An unclear contract basis is an unresolved assumption, not a reason to guess.

A reference is not the final payment

Reference arithmetic does not incorporate all coverage, units, modifiers, multiple-service rules, carve-outs, participation or benefit allocation. The CMS lookup overview itself explains the reference tool’s limitations.

For example, a whole-service percentage change cannot automatically model a Medicare therapy practice-expense reduction. Apply the correct rule to the correct component, then distinguish the allowed amount from the payer share.

Check the lookup’s supported coverage

The Medicare Benchmark page shows its dataset, supported dates and calculation limits alongside the lookup. Check those details there rather than taking a rate or release number from an article. The percentage comparison is a separate calculation, not proof of the final payment due.

The separate manual worksheet multiplies a reference amount you supply. It does not retrieve or verify that amount against CMS.

Same percentage, different reference

Illustrative example.

The percentage has not changed; the reference has. Neither $100 nor $104 is presented here as a real Medicare rate. A $4.40 benchmark difference does not establish that a payer owes $4.40.

Reference mismatches to watch for

• Using a national reference in place of a required locality.
• Mixing facility and non-facility amounts.
• Using the current year instead of the contractual reference year.
• Ignoring the rate-class or component question.
• Calling a reference result expected cash.

Before using a Medicare comparison

1. Read the clause that defines the reference.
2. Match all reference dimensions and version.
3. Retain the source and calculation date.
4. Apply separate payment rules and benefit allocation only when established.

Keep reading

Reimbursement, step by step

Sources

Apply the agreement and records relevant to your review. Examples explain the method; they do not determine a payment obligation.

• PFS documentation and files
• PFS lookup: geographic adjustment and limitations
• Therapy services: multiple procedure payment reduction