Guide

Sequestration: the 2% everyone forgets to post correctly

Summary

The reduction billers call the 2 percent is a federal budget-sequestration cut to Medicare's own payment share on a claim, applied after the allowed amount and the patient's coinsurance are already calculated. It doesn't touch what the patient owes and isn't collectible from them. Post it as its own adjustment, separate from the payer's ordinary contractual write-off, and confirm the currently applicable percentage against your MAC's guidance rather than assuming a rate you remember from a prior year still applies.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

What is the 2 percent Medicare sequestration on my remits?

The reduction billers commonly call "the 2 percent" is an across-the-board cut to the Medicare program's own payment share on a claim, required by federal budget-sequestration law rather than by anything about the specific service or patient. Medicare's own claims-processing instructions treat it as a reduction applied after the standard allowed amount and the patient's coinsurance or deductible are already calculated — not a change to what Medicare allows for the service in the first place 1Ref 1Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That CMS program instructions live in the public Internet-Only Manuals, the operative Medicare instruction treating the sequestration reduction as a cut to the program's own payment share applied after the allowed amount and cost-sharing are already calculated, unaffected by the provider's participation status.. Because it shows up as a routine line-level reduction on nearly every Medicare remittance, it's easy to post incorrectly if you don't separate it from the payer's ordinary contractual write-off.

How it's applied, and what it doesn't touch

Sequestration reduces only the government's own reimbursement share — it comes out after the allowed amount and any coinsurance or deductible have already been figured, so the claim's allowed amount, the patient's cost-sharing, and Medicare's actual deposit can all be different figures on the same remit 1Ref 1Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That CMS program instructions live in the public Internet-Only Manuals, the operative Medicare instruction treating the sequestration reduction as a cut to the program's own payment share applied after the allowed amount and cost-sharing are already calculated, unaffected by the provider's participation status.. The reduction applies the same way regardless of your own participation, non-par, opt-out status; it's a cut to the program's payment, not a function of how you're enrolled. It also carries through to crossovers: the coordination-of-benefits data forwarded to a supplemental payer reflects the allowed amount and coinsurance calculated before sequestration, so a secondary payer is never expected to cover the sequestration shortfall either.

Where it shows up on the remit

The reduction posts on your electronic remittance advice as its own adjustment, distinct from the standard write-off between your charge and Medicare's allowed amount. CARCs are the standard code list explaining why a line paid differently than billed, and X12 maintains a public directory of them, so checking your remit against the current list is how you confirm which specific code your payer uses for this reduction, rather than assuming it matches what you've seen from a different payer or a different year 2Ref 2X12 (2026).Claim Adjustment Reason Codes.That CARCs are the standard code list explaining why a claim or service line was paid differently than billed, maintained by X12 with a public list — the lookup method for identifying which specific code a payer's remit uses for the sequestration reduction.. A remark code can accompany it with additional detail, drawn from the same kind of public, X12-maintained list 3Ref 3X12 (2026).Remittance Advice Remark Codes.That RARCs supply the supplemental explanation on an 835 remittance beyond the CARC, maintained by X12 with a public list, which can accompany a sequestration reduction with additional detail.. Don't confuse either of these with a units-based reduction like an MUE — what are mue limits per day for a code is a coding limit, not a payment percentage, and mues: how many units medicare believes are billable posts as an entirely separate remit line.

Posting it correctly: why it isn't a normal write-off

Many practices lump every reduction between the charge and the deposit into one generic contractual-adjustment bucket, which quietly buries the sequestration amount inside ordinary payer write-offs and makes it look like Medicare simply pays less than it actually allowed. A cleaner convention many practices use instead is a distinct ledger code for the sequestration line, separate from the payer's contractual adjustment, so your reports reflect what Medicare actually allowed versus what federal law then trimmed off that allowed amount before deposit. If a posting error ever causes you to collect more than you were actually owed because of a misapplied sequestration entry, refunding medicare follows the same voluntary refund mechanics as any other identified overpayment.

Why you can't shift it to the patient

Because the reduction comes out of Medicare's own payment share rather than out of the allowed amount the patient's coinsurance is calculated against, it is not an amount you bill to the patient — coinsurance and deductible are unaffected by it, and the shortfall isn't collectible from the beneficiary 1Ref 1Centers for Medicare & Medicaid Services (2026).Internet-Only Manuals (IOMs).That CMS program instructions live in the public Internet-Only Manuals, the operative Medicare instruction treating the sequestration reduction as a cut to the program's own payment share applied after the allowed amount and cost-sharing are already calculated, unaffected by the provider's participation status.. It also has nothing to do with when an abn is required: an ABN is a separate, patient-notice mechanism for a service Medicare might not cover at all, while sequestration is a payment-percentage reduction on a service Medicare has already agreed to cover and pay for. Treat the sequestration amount the way you'd treat any other portion of the allowed amount Medicare doesn't ultimately pay out through no fault of the claim: an adjustment absorbed by the practice, not a balance transferred anywhere else.

The electronic remittance and where the reduction actually lives

Most practices receive this information through the standardized electronic remittance transaction rather than a paper explanation of benefits, and CAQH CORE operating rules are what require payers to support that standardized ERA/EFT format in the first place 4Ref 4CAQH (2026).CAQH CORE Operating Rules.That CAQH CORE operating rules standardize the ERA/EFT electronic remittance transaction payers must support, which is why a sequestration reduction posts as a consistent, separately identifiable field across payers that follow the standard.. That standardization is also why the reduction posts consistently field by field across payers who follow it, which matters if you're building an automated posting rule in your practice-management system: the sequestration adjustment should land in its own field, not get folded into the same bucket as the payer's ordinary contractual write-off.

Confirming the current rate

If a reduction looks larger or smaller than what you've seen on other Medicare remits, confirm the applicable percentage against your MAC's current published guidance rather than assuming it hasn't changed — the rate is set by federal law and has changed and been suspended before, so an internally remembered figure can go stale. Medicare claims administration is regionalized, and CMS publishes which mac processes my medicare claims for each jurisdiction, so your mac's own bulletins are the fastest way to confirm the currently applicable percentage without waiting for a coding vendor or a colleague to notice it changed 5Ref 5Centers for Medicare & Medicaid Services (2026).Medicare Administrative Contractors.That Medicare claims administration is regionalized across MACs and CMS publishes which MAC serves each jurisdiction, so a solo can confirm the currently applicable sequestration percentage from their own MAC's published guidance..

Common questions

It's an across-the-board cut to the Medicare program's own payment share on a claim, required by federal budget-sequestration law. It's applied after the allowed amount and the patient's coinsurance or deductible are already calculated, so it reduces only what Medicare itself pays out — not the amount the claim was allowed for, and not what the patient owes.

No. The reduction comes out of Medicare's payment share, not the allowed amount the patient's coinsurance is calculated against, so it isn't a collectible patient balance. Post it as an adjustment absorbed by the practice, the same way you'd treat any other portion of the allowed amount Medicare doesn't ultimately pay through no fault of the claim.

It posts as its own line, separate from the payer's ordinary contractual write-off. CARCs are the standard code list explaining why a line paid differently than billed, and checking your remit against the current X12-maintained list confirms which specific code your payer uses, rather than assuming it matches a code you've seen elsewhere.

Many practices instead use a separate ledger code for it. Folding it into the same bucket as the payer's contractual write-off buries the amount and makes your reports understate what Medicare actually allowed for the service. A distinct code keeps the allowed amount, the contractual adjustment, and the sequestration cut visible as three separate figures.

Yes — it's set by federal law and has changed and been suspended before, so it isn't a number to memorize permanently. Confirm the currently applicable percentage against your MAC's published guidance rather than assuming a rate from a prior year still applies.

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References

1.Centers for Medicare & Medicaid Services (2026). Internet-Only Manuals (IOMs). Centers for Medicare & Medicaid Services (CMS). link ✓That CMS program instructions live in the public Internet-Only Manuals, the operative Medicare instruction treating the sequestration reduction as a cut to the program's own payment share applied after the allowed amount and cost-sharing are already calculated, unaffected by the provider's participation status.
2.X12 (2026). Claim Adjustment Reason Codes. X12. link ✓That CARCs are the standard code list explaining why a claim or service line was paid differently than billed, maintained by X12 with a public list — the lookup method for identifying which specific code a payer's remit uses for the sequestration reduction.
3.X12 (2026). Remittance Advice Remark Codes. X12. link ✓That RARCs supply the supplemental explanation on an 835 remittance beyond the CARC, maintained by X12 with a public list, which can accompany a sequestration reduction with additional detail.
4.CAQH (2026). CAQH CORE Operating Rules. CAQH CORE. link ✓That CAQH CORE operating rules standardize the ERA/EFT electronic remittance transaction payers must support, which is why a sequestration reduction posts as a consistent, separately identifiable field across payers that follow the standard.
5.Centers for Medicare & Medicaid Services (2026). Medicare Administrative Contractors. Centers for Medicare & Medicaid Services (CMS). link ✓That Medicare claims administration is regionalized across MACs and CMS publishes which MAC serves each jurisdiction, so a solo can confirm the currently applicable sequestration percentage from their own MAC's published guidance.

https://www.gale.care/for-providers/cm-medicare-sequestration-2pct · 5 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

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