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CO-132 Denial Code: Demonstration Project Adjustment

CO-132 is a prearranged demonstration project adjustment. The payment was changed because the claim fell under a demonstration or pilot program with its own payment terms, agreed in advance between the payer and participating providers.

Code: CO-132 (CARC 132)
Status: Active In use since February 28, 1997.
Code set: Claim Adjustment Reason Codes (CARC)
Group codes: CO (Contractual Obligation): The adjustment follows the demonstration's payment terms, which bind the participating provider. It is not billable to the patient.
Official description: Prearranged demonstration project adjustment.
X12 Claim Adjustment Reason Codes, retrieved September 25, 2026
Last verified: September 24, 2026 against the official X12 list.

What CO-132 means

CARC 132 reads prearranged demonstration project adjustment. Payers, especially Medicare and state Medicaid programs, run demonstration projects to test new payment and care models. Providers who take part agree to the program’s payment terms in advance. When a claim is processed under those terms, the difference from normal payment is reported with CARC 132.

“Prearranged” is the key word. The adjustment should correspond to terms you, or an organization you belong to, agreed to before the service.

Example: a practice participates in a pilot that pays certain services at a different rate. Claims for enrolled patients show a CO-132 adjustment reflecting the program’s pricing.

Common causes

Your practice, hospital, or accountable care organization participates in a demonstration or pilot with its own payment rules.
The patient is attributed or enrolled in a demonstration that changes how the service is paid.
A demonstration is ending, and the payer is applying transition pricing.
The payer flagged the claim or patient as part of a demonstration by mistake.

How to fix it

Confirm participation. Check whether you or an affiliated organization joined the demonstration, and whether the patient is enrolled or attributed.
Review the program terms and compare the adjustment with the expected payment.
If the adjustment is correct, post it as a contractual adjustment.
If you are not a participant or the patient was not enrolled on the date of service, contact the payer and request reprocessing under standard terms.
Do not bill the patient. Demonstration adjustments are between the payer and the provider.

How to prevent problems with CO-132

Keep a register of demonstrations and value-based programs your organization participates in, with start and end dates.
Share program pricing rules with billing and posting staff.
Monitor demonstration-related adjustments with an ERA Analyzer to verify they match program terms.
Watch for program end dates so claims return to standard pricing when a demonstration ends.
Confirm patient enrollment or attribution lists regularly. A patient who left a program but is still flagged, or who joined but is not yet flagged, can cause the wrong pricing on every claim until the list is fixed.
For reading adjustment codes more broadly, see how to read CARC and RARC codes.

Remark codes that may appear with CO-132

MA132 (Adjustment to the pre-demonstration rate.): Adjustment to the pre-demonstration rate.
M116 (Processed under a demonstration project or program.): Processed under a demonstration project that is ending; later services may not be paid under it.
M138 (Patient identified as a demonstration participant but the patient was not enrolled in the demonstration at the time services were rendered.): The patient was identified as a demonstration participant but was not enrolled on the date of service.

CO-45 (Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement.): Standard fee schedule reduction outside any demonstration.
CO-245 (Provider performance program withhold.): Provider performance program withhold, often part of value-based models.
CO-161 (Provider performance bonus): Provider performance bonus under an incentive program.
CO-274 (Fee/Service not payable per patient Care Coordination arrangement.): Fee or service not payable under a patient care coordination arrangement.

CO-132 FAQ

What is a demonstration project?

A pilot program, often run by CMS or a state Medicaid agency, that tests a new payment or care model with participating providers before any wider rollout.

Why am I seeing CO-132 if I did not join a demonstration?

Ask the payer. You may have been enrolled through an affiliated organization, or the payer may have wrongly flagged your claim or patient.

Is CO-132 a denial?

No. It is a payment adjustment made under the terms of the program.

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