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 | |
|---|---|---|---|---|---|
| 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 → |
| X225 | MEDICARE REQUIRES THAT AN OPERATIVE REPORT BE SUBMITTED WHEN MORE THAN 5 PROCEDURES HAVE BEEN PERFO… |
M29
Missing operative note/report. |
CO | 252 | View → |
| X226 | PER CMS GUIDELINES, THE PRESENSE OF MODIFIER 54 INDICATES THAT ONLY INTRA-OPERATIVE PORTION OF THE … |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| X227 | PER CMS GUIDELINES, THE PRESENSE OF MODIFIER 55 INDICATES THAT ONLY POST-OPERATIVE PORTION OF THE G… |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| X228 | PER CMS GUIDELINES, THE PRESENSE OF MODIFIER 56 INDICATES THAT ONLY PRE-OPERATIVE PORTION OF THE GL… |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| X229 | PER CMS GUIDELINES, THE PRESENSE OF MODIFIER 78 INDICATES THAT ONLY INTRA-OPERATIVE PORTION OF THE … |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| X23 | THE OTHER DIAGNOSIS CODE INDICATES THAT A WRONG PATIENT PROCEDURE WAS PERFORMED |
N657
This should be billed with the appropriate code for th… |
CO | 11 | View → |
| X239 | GENERAL SYSTEM ERROR | — | CO | 16 | View → |
| X24 | THE ADMISSION DIAGNOSIS IS A NONSPECIFIC DIAGNOSIS CODE AND REQUIRES A FOURTH AND/OR FIFTH DIGIT. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| X240 | NPI PROVIDER INFO NOT FOUND |
MA81
Missing/incomplete/invalid provider/supplier signature. |
CO | 16 | View → |
| X241 | FEDERAL/STATE PROGRAM RATE IS NOT FOUND. |
n130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| X243 | NPI IS NOT VALID. | — | CO | 207 | View → |
| X245 | WAGE INDEX FOR THIS CLAIM IS NOT DEFINED |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| X246 | MEDICAID/PROGRAM STATE FACTOR FOR THIS CLAIM IS NOT DEFINED |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| X25 | THE PRINCIPAL DIAGNOSIS IS A NONSPECIFIC DIAGNOSIS CODE AND REQUIRES A FOURTH AND/OR FIFTH DIGIT. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X250 | ADMIT/STATEMENT FROM DATE MISSING OR NOT VALID |
MA40
Missing/incomplete/invalid admission date. |
CO | 16 | View → |
| X251 | DISCHARGE/STATEMENT TO DATE IS MISSING OR NOT VALID. |
N318
Missing/incomplete/invalid discharge or end of care da… |
CO | 16 | View → |
| X252 | ADMIT/STATEMENT FROM DATE CANNOT BE GREATER THAN THE DISCHARGE/STATEMENT DATE. |
MA40
Missing/incomplete/invalid admission date. |
CO | 16 | View → |
| X253 | DISCHARGE/STATEMENT DATE EXCEEDS THE MAXIMUM 12 MONTHS STATUTORY REQUIREMENT FOR TIMELY FILING. | — | CO | 29 | View → |
| X255 | DATE OF BIRTH IS MISSING OR INVALID |
N329
Missing/incomplete/invalid patient birth date. |
CO | 16 | View → |
| X256 | THE VALUE CODE(S) PRESENT ON THE CLAIM ARE NOT VALID |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
CO | 16 | View → |
| X257 | THE CONDITION CODE(S) PRESENT ON THE CLAIM ARE NOT VALID. |
M44
Missing/incomplete/invalid condition code. |
CO | 16 | View → |
| X258 | SOURCE OF ADMISSION IS MISSING OR NOT VALID. |
MA42
Missing/incomplete/invalid admission source. |
CO | 16 | View → |
| X259 | TYPE OF ADMISSION IS MISSING OR NOT VALID. |
MA41
Missing/incomplete/invalid admission type. |
CO | 16 | View → |
| X26 | THE OTHER DIAGNOSIS IS A NONSPECIFIC DIAGNOSIS CODE AND REQUIRES A FOURTH AND/OR FIFTH DIGIT. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | 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.