Browse all standardized Remark Codes (RARC) used on Medicare, Medicaid, and commercial payer remittance advice (835 ERA / EOB). Each code includes its RA835 mapping, adjustment group, reason code, and a dedicated resolution guide.
Browse Claim Adjustment Reason Codes — the codes that explain why a payment was reduced or denied.
| Remark Code | Description | RA835 Code | Group | Reason Code | |
|---|---|---|---|---|---|
| Y456 | Service is not payable under the FQHC encounter rate. |
N174
This is not a covered service/procedure/ equipment/bed… |
CO | 96 | View → |
| Y468 | NDC billed is not in the proper format. The NDC must be in the 5-4-2 configuration. (line level de… |
M119
Missing/incomplete/invalid/ deactivated/withdrawn Nati… |
CO | 16 | View → |
| Y469 | NDC billed is not in the proper format. The NDC must be in the 5-4-2 configuration. (claim level d… |
M119
Missing/incomplete/invalid/ deactivated/withdrawn Nati… |
CO | 16 | View → |
| Y471 | Procedure code requires that an NDC must be billed according to NDC billing guidelines. (claim leve… |
N657
This should be billed with the appropriate code for th… |
CO | 16 | View → |
| Y472 | S5190 is for reporting purposes only and is not payable. | — | CO | 246 | View → |
| Y474 | Place of service is illogical. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 16 | View → |
| Y475 | Long Acting Reversible Contraception (LARC) must be billed separately from the encounter. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| Y499 | INSTITUTIONAL CLAIM WAS REGROUPED BASED ON POLICY. FINAL APR-DRG WAS CHANGED. | — | CO | 45 | View → |
| Y5 | THE PATIENT SEX IS INVALID |
MA39
Missing/incomplete/invalid gender. |
CO | 16 | View → |
| Y500 | DIAGNOSTIC/THERAPEUTIC IMAGING RADIOPHARMACEUTICAL / CONTRAST AGENT LINK IS NOT COVERED BY MEDICARE… |
N657
This should be billed with the appropriate code for th… |
CO | 16 | View → |
| Y508 | Drug unit qualifier (unit of measure) is missing or invalid |
M123
Missing/incomplete/invalid name, strength, or dosage o… |
CO | 16 | View → |
| Y517 | Possible improper billing of Accute Kidney Injury claim (Eff. 1/1/2017) |
N657
This should be billed with the appropriate code for th… |
CO | 16 | View → |
| Y518 | Revenue code is no longer valid for this service, please rebill with correct H code. |
M50
Missing/incomplete/invalid revenue code(s). |
CO | 16 | View → |
| Y519 | Place of service is missing or not valid. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 16 | View → |
| Y520 | Procedure code must be billed with Place of Service 55. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 16 | View → |
| Y521 | Series Bill Revenue Code Required |
M50
Missing/incomplete/invalid revenue code(s). |
CO | 16 | View → |
| Y539 | Inpatient Principal Hospital Acquired Condition | — | CO | 233 | View → |
| Y540 | Inpatient Other Hospital Acquired Condition | — | CO | 233 | View → |
| Y546 | THIS LINE ITEM CONFLICTS WITH CCI EDIT POLICY. | — | CO | 16 | View → |
| Y547 | DME CODE BILLED WITH INVALID MODIFIER. |
N572
This procedure is not payable unless appropriate non-p… |
CO | 4 | View → |
| Y548 | PAYMENT FOR DISCONTINUED PROCEDURES IS BASED ON PERCENTAGE OF SERVICE COMPLETED. PLEASE SUBMIT MED… |
N204
Services under review for possible pre-existing condit… |
CO | 163 | View → |
| Y549 | AB CODE IS PART OF AN AUTOMATED PANEL. REIMBURSEMENT IS A PERCENTAGE OF MPFS ALLOWABLE. |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| Y550 | FX MODIFIER (FILM XRAY) HAS A 20% REDUCTION OF THE TC (AND THE TC OF THE GLOABEL FEE) EFFECTIVE 1/1… |
N546
Payment represents a previous reduction based on the E… |
CO | 45 | View → |
| Y551 | THIS IS A DUPLICATE LINE ITEM |
N111
No appeal right except duplicate claim/service issue. … |
CO | 18 | View → |
| Y552 | SUPPLIES FURNISHED BY COMPREHENSIVE OUTPATIENT REHABILITATION FACILITIES (CORFS) OR OUTPATIENT PHYS… |
M15
Separately billed services/tests have been bundled as … |
CO | 97 | View → |
| Y553 | (CERCLAGE REMOVAL) WILL BE DENIED AS INCLUDED IN THE DELIVERY FEE, WHEN THE REMOVAL OF A CERCLAGE I… |
N55
Procedures for billing with group/referring/performing… |
CO | 16 | View → |
| Y554 | PROCEDURE CODE REQUIRES ICD-10 Z00.6 ALSO BE BILLED ON THE CLAIM. |
M76
Missing/incomplete/invalid diagnosis or condition. |
CO | 16 | View → |
| Y555 | DME CODE BILLED WITH MODIFIER WILL BE DENIED BECAUSE SAME EQUIPMENT HAS BEEN PURCHASED WITHIN PAST … |
N417
This service is allowed 1 time in a 5-year period. |
CO | 119 | View → |
| Y556 | (STERILE SALINE) BILLED WITH ORORPHARYNGEAL SUCTION CATHETER WHEN A TRACHEAL SUCTION CATHETER HAS N… |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 16 | View → |
| Y557 | (MASTECTOMY BRA) WILL BE DENIED IF BREAST PROSTHESIS HAS NOT BEEN BILLED WITHIN THE PREVIOUS TWO (2… |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 16 | View → |
| Y558 | () IS DENIED BECAUSE THE SAME PROCEDURE HAS BEEN RENDERED TO THE MEMBER ON WITHIN THE PREVIOUS FIVE… |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y559 | (DME REPAIR) IS DENIED BECAUSE THE MEMBER HAS DURABLE MEDICAL EQUIPMENT PURCHASE ON THE SAME SERVIC… |
M86
Service denied because payment already made for same/s… |
CO | 16 | View → |
| Y560 | (DME REPAIR) IS DENIED BECAUSE IT WAS BILLED WITH A FREQUENTLY SERVICED RENTAL ITEM APPENDED WITH M… |
MA114
Missing/incomplete/invalid information on where the se… |
CO | 16 | View → |
| Y561 | (POWER WHEELCHAIR ACCESSORY) IS DENIED BECAUSE POWER WHEELCHAIR WAS NOT FOUND IN CLAIM HISTORY WITH… |
MA114
Missing/incomplete/invalid information on where the se… |
CO | 151 | View → |
| Y562 | STATIONARY OXYGEN SYSTEM IS NOT COVERED BY CMS WHEN BILLED MORE THAN ONCE WITHIN THE SAME MONTH. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y563 | PORTABLE OXYGEN SYSTEM IS NOT COVERED BY CMS WHEN BILLED MORE THAN ONCE WITHIN THE SAME MONTH. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y564 | OXYGEN ACCESSORY IS NOT COVERED BY CMS WHEN BILLED WITH OXYGEN RENTAL SYSTEM ON THE SAME MONTH. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y565 | STATIONARY OXYGEN CONTENTS IS NOT COVERED BY CMS WHEN BILLED WITH STATIONARY OXYGEN RENTAL SYSTEM O… |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y566 | NEBULIZER IS NOT COVERED IF BILLED MORE THAN ONCE EVERY MONTHS |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y567 | RESPIRATORY ASSIST DEVICE IS NOT COVERED IF BILLED MORE THAN ONCE EVERY MONTHS |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y568 | TENS DEVICE IS NOT COVERED BY CMS AS A PURCHASE IF IT HAS NOT BEEN BILLED WITH A RENTAL MODIFIER (R… |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y569 | TENS SUPPLIES ARE NOT COVERED BY CMS BECASE A TENS DEVICE WAS BILLED ON ANOTHER CLAIM. |
N522
Duplicate of a claim processed, or to be processed, as… |
CO | 18 | View → |
| Y570 | TENS SUPPLIES ARE NOT COVERED BY CMS BECAUSE "A4595" WAS BILLED ON ANOTHER CLAIM. |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 16 | View → |
| Y571 | REPLACEMENT LEAD WIRES ARE NOT COVERED BY CMS BECAUSE A TENS DEVICE WAS BILLED ON ANOTHER CLAIM. |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 272 | View → |
| Y572 | PRESSURE REDUCING SUPPORT SURFACE IS NOT COVERED BY CMS WHEN BILLED MORE THAN ONCE WITHIN THE SAME … |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| Y573 | ORTHOSES ADDITION CODES ARE NOT ELIGIBLE FOR SEPARATE PAYMENT. |
N15
Services for a newborn must be billed separately. |
CO | 97 | View → |
| Y574 | ORTHOSES ADDITION CODES ARE INCLUDED IN PRIMARY PROCEDURE. |
M75
Multiple automated multichannel tests performed on the… |
CO | 236 | View → |
| Y575 | E/M PROCEDURE WAS BILLED ON THE SAME DATE OF SERVICE WITH CARDIOVASCUALR SERVICE WITHOUT AN APPROPR… |
N572
This procedure is not payable unless appropriate non-p… |
CO | 16 | View → |
| Y576 | E/M PROCEDURE WAS BILLED ON THE SAME DATE OF SERVICE WITH CARDIOVASCUALR SERVICE ON HISTORY CLAIM ,… |
N13
Payment based on professional/technical component modi… |
CO | 16 | View → |
| Y577 | VERTEBRAL AXIAL DECOMPRESSION, PER SESSION, IS A NON-COVERED SERVICE. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 204 | View → |
Remark Codes (RARC) are used on the 835 ERA and paper EOB to provide supplemental information about a claim adjustment. They always accompany a CARC (denial code) and clarify the reason for payment differences.
A Denial Code (CARC) explains why payment was adjusted. A Remark Code (RARC) provides additional context or instructions. Both appear together on remittance — look for the CARC first, then the RARC for detail.
Search by code number or keyword, or filter by adjustment group (CO, PR, OA…). Click any code to see its full RA835 mapping, common causes, step-by-step resolution guide, and appeal tips.