Assignment (Medicare)
In Medicare, assignment is an agreement by which a provider or supplier accepts the Medicare-approved amount as full payment for a covered service, billing Medicare directly and limiting what the patient owes to applicable deductible and coinsurance.
Updated
Assignment is the arrangement under which a physician, practitioner, or supplier agrees to accept the Medicare-approved amount for a covered service as payment in full. Under this arrangement, Medicare pays its share directly to the provider, and the beneficiary is responsible only for cost-sharing amounts such as any unmet deductible and coinsurance rather than the difference between the provider's charge and the approved amount.
Whether a provider accepts assignment relates to their Medicare participation status. Under original (fee-for-service) Medicare, a "participating" provider has agreed to accept assignment on all covered services, while a "non-participating" provider may accept assignment on a case-by-case basis and, when not accepting it, is subject to federal limits on what may be charged to the beneficiary. The specific approved amounts, cost-sharing figures, and charge limits are set by CMS and change over time, so the authoritative CMS fee schedules and manuals should be consulted rather than any fixed number.
The concept is defined and administered through CMS rules, including the Medicare claims processing manuals and Medicare Learning Network materials. It applies to how a claim is paid and how patient liability is calculated; it is distinct from whether a service is covered in the first place.
In practice
In billing operations, assignment affects who receives Medicare's payment and how patient balances are calculated. When a claim is submitted on an assigned basis, Medicare remits its portion to the provider and the remittance advice shows the approved amount, the Medicare payment, and the beneficiary's cost-sharing responsibility. Billing staff reconcile these amounts and bill the patient only for allowed cost-sharing, not for amounts above the approved rate.
Because participation status and any applicable charge limits are governed by federal rules that CMS updates periodically, billing teams typically verify a provider's current enrollment and participation status through the CMS enrollment system and rely on current CMS fee schedules and manuals to determine correct patient liability. Specific dollar thresholds, limiting-charge percentages, and payment differentials vary by year and by locality and should be taken from the authoritative CMS source in effect for the date of service.
Commonly confused with
- Participation (PAR) status: Participation is a provider's standing agreement with Medicare to accept assignment on all covered services; assignment is the payment arrangement itself, which a non-participating provider can still choose on individual claims.
- Assignment of benefits: In commercial and general insurance contexts, an assignment of benefits is a patient authorization directing an insurer to pay the provider; Medicare assignment is a narrower, statutorily defined agreement to accept the Medicare-approved amount as payment in full.
- Coverage / medical necessity: Assignment governs how a covered claim is paid and how much the patient owes, not whether Medicare covers the service; a service can be covered yet billed with or without assignment.