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 | |
|---|---|---|---|---|---|
| X128 | Claim lacks required primary code | — | CO | 16 | View → |
| X129 | Claim lacks required device code or required procedure code |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X13 | ADMISSION DIAGNOSIS IS NOT TYPICAL FOR A PATIENT OF THIS GENDER. | — | CO | 10 | View → |
| X130 | Manifestation code not allowed as principal diagnosis |
MA66
Missing/incomplete/invalid principal procedure code. |
CO | 16 | View → |
| X131 | Skin substitute application procedure without appropriate skin substitute product code |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X132 | payment code not reported for FQHC claim |
M79
Missing/incomplete/invalid charge. |
CO | 16 | View → |
| X133 | FQHC claim lacks required qualifying visit code |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X134 | Incorrect revenue code reported for FQHC payment code |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X135 | Item or service not covered under FQHC PPS | — | CO | 96 | View → |
| X136 | Device-dependent procedure reported without device code |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X137 | PER MEDICARE'S UNLIKELY EDITS POLICY, THE UNITS OF SERVICE BILLED FOR THE PROCEDURE EXCEEDS THE ALL… |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 45 | View → |
| X138 | Item or service expected to be denied as not reasonable and necessary. |
N227
Incomplete/invalid Certificate of Medical Necessity. |
CO | 50 | View → |
| X139 | MULTIPLE MEDICAL VISITS (BASED ON UNITS AND/OR LINES) ARE PRESENT ON THE SAME DAY WITH THE SAME REV… |
M86
Service denied because payment already made for same/s… |
CO | 16 | View → |
| X14 | PRINCIPAL DIAGNOSIS IS NOT TYPICAL FOR A PATIENT OF THIS GENDER. |
N517
Resubmit a new claim with the requested information. |
CO | 10 | View → |
| X142 | THE HISTORICAL PROCEDURE CODE SHOULD BE REVIEWED FOR A POTENTIAL MULTIPLE PROCEDURE REDUCTION. |
M15
Separately billed services/tests have been bundled as … |
CO | 59 | View → |
| X143 | This service is not appropriate for medicare patients in an ambulatory surgery center setting |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 5 | View → |
| X144 | Service does not meet the guidelines for TOB 14x. |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 59 | View → |
| X146 | The surgical procedure code has been crosswalked to an anesthesia procedure code for analysis of th… | N29 | CO | 16 | View → |
| X147 | THE PROCEDURE WAS BILLED BY A PROVIDER NOT LISTED AS AN ANESTHESIOLOGY PROVIDER. |
N95
This provider type/provider specialty may not bill thi… |
CO | 8 | View → |
| X148 | AN ANESTHESIA SERVICE WITH AN EQUAL OR HIGHER BASE UNIT VALUE WAS BILLED ON PREVIOUS CLAIM. ONLY TH… | — | CO | 59 | View → |
| X149 | HISTORICAL - AN ANESTHESIA SERVICE WITH AN EQUAL OR HIGHER BASE UNIT VALUE WAS BILLED ON A PREVIOU… |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 59 | View → |
| X15 | OTHER DIAGNOSIS IS NOT TYPICAL FOR A PATIENT OF THIS GENDER. |
N517
Resubmit a new claim with the requested information. |
CO | 10 | View → |
| X150 | THE SYSTEM WAS UNABLE TO CROSSWALK THE SURGICAL CODE TO AN ANESTHESIA CODE SINCE THE ANESTHESIA CRO… |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X151 | THE PROCEDURE CODE REQUIRES A CROSSWALK TO AN ANESTHESIA CODE PRIOR TO EDITING. REPLACE THE SURGIC… | N29 | CO | 16 | View → |
| X152 | ANESTHESIA MODIFIER REDUCTION POLICY (THE MODIFIER ON THIS CLAIM LINE INDICATES THE SERVICE SHOULD … | — | CO | 144 | View → |
| X153 | ANESTHESIA CODE ON THIS LINE REQUIRES AN APPROPRIATE MODIFIER. |
N13
Payment based on professional/technical component modi… |
CO | 4 | View → |
| 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 → |
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.