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Update to CARC and RARC codes for use with MREP 4.6

February 25, 2026
An updated remittance advice remark code (RARC) and claim adjustment reason code (CARC) “Codes.ini” file is now available for download.

Returned or rejected as unprocessable claims affect timely filing

February 16, 2026
A claim must be submitted to Medicare no later than one year after the date of service to be considered filed timely. Claims returned or rejected as unprocessable have not been filed successfully.

Process for pathology, laboratory, and other codes

March 11, 2026
Avoid negative impacts to your claims by providing the medical records for the laboratory, pathology and other codes claims submissions indicated in this article. First Coast requests specific documentation with submission of these codes. P…

Avoiding hospice claim rejects

January 27, 2026
Providers billing Medicare should determine if a patient is enrolled in hospice before billing Medicare Part A. This article has tips on checking patient eligibility and avoiding hospice claim rejects.

Process for supplying invoice amount on certain HCPCS codes - avoid rejected claims

May 12, 2026
The supply codes list has been updated.

Avoid negative impacts to your claims -- review LCD L39073 and billing and coding article A58812 pharmacogenomics testing

March 6, 2026
Important information you must know if you bill for pharmacogenomics testing.

Tips to prevent claim adjustment reason code (CARC) CO 22

March 17, 2026
CARC 22 - This care may be covered by another payer per coordination of benefits. This denial was received because Medicare records indicate that Medicare is the secondary payer.

Tips to prevent claim adjustment reason code (CARC) CO 97

December 23, 2025
There are a few scenarios that exist for denial reason code CO 97, as outlined below. Please review the associated remittance advice remark code (RARC) noted on the remittance advice for your claim and then refer to the specific resources a…

Tips to prevent reject reason code C7010

March 10, 2026
Read this article for tips on how to prevent reject reason code C7010.

Tips to prevent claim adjustment reason code (CARC) PR 49

March 17, 2026
Read this article for tips on how to prevent claim adjustment reason code (CARC) PR 49.
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