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 | |
|---|---|---|---|---|---|
| X154 | PAYMENT FOR THE PROCEDURE CODE IS ALWAYS BUNDLED INTO PAYMENT FOR OTHER SERVICES NOT SPECIFIED AND … |
N390
This service/report cannot be billed separately. |
CO | 234 | View → |
| X155 | PER MEDICARE GUIDELINES THE PROCEDURE CODE IS AN ITEM OR SERVICE THAT HAS NO SEPARATE PAYMENT UNDER… |
N390
This service/report cannot be billed separately. |
CO | 234 | View → |
| X156 | MEDICARE CONSIDERS THE PROCEDURE CODE AS A BUNDLED SERVICE WHEN OTHER PAYABLE SERVICES ARE BILLED O… |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| X157 | PER CCI GUIDELINES, PROCEDURE CODE HAS AN UNBUNDLE RELATIONSHIP WITH PROCEDURE CODE WITH ANOTHER CO… |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| X158 | PER CCI GUIDELINES, HISTORY PROCEDURE CODE ON HISTORY CLAIM HAS AN UNBUNDLE RELATIONSHIP WITH THE P… |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| X159 | PER MEDICARE GUIDELINES, THE PROCEDURE CODE IS BUNDLED WITH AN ALL INCLUSIVE AMBULANCE SERVICE. |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| X16 | A MANIFESTATION CODE CAN NOT BE USED AS THE ADMITTING DIAGNOSIS. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| X160 | ADULT/MATERNITY/NEWBORN/PEDIATRIC DIAGNOSIS IS NOT TYPICAL FOR THE PATIENT'S AGE. |
N517
Resubmit a new claim with the requested information. |
CO | 9 | View → |
| X161 | THE DIAGNOSIS IS INVALID OR DISABLED. |
M76
Missing/incomplete/invalid diagnosis or condition. |
CO | 16 | View → |
| X162 | THERE IS NO PRIMARY DIAGNOSIS LISTED FOR THIS PROCEDURE. |
M76
Missing/incomplete/invalid diagnosis or condition. |
CO | 16 | View → |
| X163 | THE DIAGNOSIS IS A NONSPECIFIC DIAGNOSIS CODE AND REQUIRES MORE DIGITS |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X164 | THE DIAGNOSIS IS NOT TYPICAL FOR THE PATIENT'S GENDER. |
N517
Resubmit a new claim with the requested information. |
CO | 9 | View → |
| X165 | THE DIAGNOSIS DESCRIBES AN EXTERNAL CAUSE, OR REQUIRES THE ICD CODE FOR THE FIRST UNDERLYING DISEAS… |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X166 | THE DIAGNOSIS CODE COULD INVOLVE THIRD PARTY LIABILITY AND/OR SUBROGATION OF BENEFITS |
N23
Alert: Patient liability may be affected due to coordi… |
CO | 22 | View → |
| X167 | USE OF MODIFIER 59 MAY REQUIRE SUPPORTING DOCUMENTATION | — | CO | 251 | View → |
| X17 | A MANIFESTATION CODE CAN NOT BE USED AS THE PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X173 | THE E/M CODE WAS BILLED ON THE SAME DATE OF SERVICE OR ONE DAY PRIOR TO A DIFFERENT PROCEDURE WITHO… |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| X174 | SAME CLAIM - THE E/M CODE WAS BILLED ON THE SAME DATE OF SERVICE OR ONE DAY PRIOR TO A DIFFERENT PR… |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| X175 | THIS PATIENT RECEIVED CARE BY PROVIDER WITHIN THE LAST THREE YEARS. AN ESTABLISHED PATIENT E/M CODE… |
MA130
Your claim contains incomplete and/or invalid informat… |
CO | 16 | View → |
| X176 | ONLY ONE E&M SERVICE MAY BE REPORTED UNLESS THE EVALUATION AND MANAGEMENT SERVICES ARE FOR UNRELATE… |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| X177 | THE PROCEDURE WAS BILLED ON THE SAME DATE OF SERVICE OR ONE DAY PRIOR TO AN E/M CODE WITHOUT AN APP… |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| X178 | THE E&M PROCEDURE CODE IS WITHIN THE GLOBAL PERIOD OF THE DAYS OF THE PROCEDURE CODE PERFORMED, BY … |
N525
These services are not covered when performed within t… |
CO | 96 | View → |
| X18 | THE PRINCIPAL DIAGNOSIS IS NOT NORMALLY SUFFICIENT JUSTIFICATION FOR ADMISSION TO A HOSPITAL. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X180 | THE PROCEDURE IS WITHIN THE GLOBAL PERIOD OF DAYS OF THE PROCEDURE CODE WAS PERFORMED, BY THE SAME … |
N525
These services are not covered when performed within t… |
CO | 96 | View → |
| X19 | THE DIAGNOSIS CODE IS NOT ACCEPTABLE AS A PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X190 | DISCREPANCY DETECTED BETWEEN THE NUMBER OF UNITS ON THIS CLAIM LINE AND THE DIFFERENCE BETWEEN BEGI… |
M53
Missing/incomplete/invalid days or units of service. |
CO | 16 | View → |
| X192 | THE MODIFIER CANNOT BE ON THE SAME LINE AS OTHER MODIFIERS. |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| X193 | THE MODIFIER IS DISABLED/NOT VALID |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| X2 | PRINCIPAL DIAGNOSIS: THE PRINCIPAL DIAGNOSIS IS INVALID OR DISABLED. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X20 | THE DIAGNOSIS CODE IS NOT ACCEPTABLE AS A PRINCIPAL DIAGNOSIS UNLESS A SECONDARY DIAGNOSIS IS PRESE… |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X207 | THE PRESENCE OF MODIFIER GZ INDICATES THIS IS NOT ELIGIBLE FOR PAYMENT. |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| X208 | PER MEDICARE GUIDELINES, THE HCPCS CODE IS IDENTIFIED AS AN AMBULANCE CODE AND REQUIRES AN AMBULANC… |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| X209 | THE DIAGNOSTIC PROCEDURE CODE BILLED BY A PHYSICIAN REQUIRES A 26 MODIFIER WHEN PERFORMED IN A FACI… |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| X21 | HAC STATUS: ONE OR MORE HAC CRITERIA MET, FINAL DRG CHANGES |
N647
Adjusted based on diagnosis-related group (DRG). |
CO | A8 | View → |
| X210 | THE PAYMENT MODIFIER IS REQUIRED TO BE IN THE FIRST POSITION WHEN BILLED UNLESS ANOTHER PAYMENT MOD… |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| X211 | THE PROCEDURE CODE DOES NOT TYPICALLY REQUIRE PERFORMANCE BY A PHYSICIAN IN PLACE OF SERVICE SPECIF… |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 58 | View → |
| X212 | THE PROCEDURE CODE IS A PHYSICAL THERAPY SERVICE. NO PAYMENT IS MADE IF PROVIDED IN PLACE OF SERVIC… |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 58 | View → |
| X213 | THE PROCEDURE CODE IS NOT TYPICALLY PERFORMED BY A PHYSICIAN AT THIS PLACE OF SERVICE. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 58 | View → |
| X214 | THE PROCEDURE CODE HAS BEEN DELETED OR NOT VALID. |
N517
Resubmit a new claim with the requested information. |
CO | 181 | View → |
| X215 | THE PRIMARY PROCEDURE CODE IN HISTORY THAT IS ASSOCIATED WITH THIS ADD-ON HAS RECEIVED AN EDIT WITH… | — | CO | 234 | View → |
| X216 | THE PROCEDURE CODE IS NOT COVERED BY MEDICARE. | — | CO | 204 | View → |
| X217 | THE PROCEDURE CODE IS NOT VALID FOR MEDICARE PURPOSES. |
N643
The services billed are considered Not Covered or Non-… |
CO | 96 | View → |
| X218 | THE ADD-ON PROCEDURE CODE HAS BEEN SUBMITTED WITHOUT AN APPROPRIATE PRIMARY PROCEDURE |
N122
Add-on code cannot be billed by itself. |
CO | 16 | View → |
| X219 | THE PROCEDURE CODE DOES NOT HAVE A MEDICARE ALLOWABLE |
N448
This drug/service/supply is not included in the fee sc… |
CO | 96 | View → |
| X22 | THE PRINCIPAL DIAGNOSIS CODE INDICATES THAT A WRONG PATIENT PROCEDURE WAS PERFORMED |
N350
Missing/incomplete/invalid description of service for … |
CO | 16 | View → |
| X220 | THE PROCEDURE CODE IS AN UNLISTED PROCEDURE OR SERVICE |
M81
You are required to code to the highest level of speci… |
CO | 189 | View → |
| X221 | THE PROCEDURE CODE IS NOT REIMBURSED BY MEDICARE. | — | CO | 96 | View → |
| X222 | THE PROCEDURE CODE IS PART OF A BILATERAL PROCEDURE AND A REDUCTION WAS APPLIED. |
N644
Reimbursement has been made according to the bilateral… |
CO | 203 | View → |
| X223 | THIS PROCEDURE CODE INDICATES THAT MULTIPLE SERVICES WERE PERFORMED. PER CMS, A REDUCTION OF TECHNI… | — | CO | 203 | View → |
| X224 | THIS PROCEDURE CODE QUALIFIES FOR A MULTIPLE ENDOSCOPY REDUCTION AND PAYMENT SHOULD BE REDUCED BY T… | — | CO | 59 | 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.