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 | |
|---|---|---|---|---|---|
| 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 → |
| X260 | PATIENT GENDER IS MISSING OR NOT VALID. |
MA39
Missing/incomplete/invalid gender. |
CO | 16 | View → |
| X261 | PLACE OF SERVICE IS MISSING OR NOT VALID. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 16 | View → |
| X262 | ONLY ONE PRINCIPAL DIAGNOSIS IS ALLOWED PER CLAIM. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X263 | ONLY ONE PRINCIPAL PROCEDURE IS ALLOWED PER CLAIM. |
MA66
Missing/incomplete/invalid principal procedure code. |
CO | 16 | View → |
| X264 | AGE IS INVALID; NOT IN RANGE OF 0 - 124 YEARS. |
N329
Missing/incomplete/invalid patient birth date. |
CO | 16 | View → |
| X266 | NPI IS MISSING OR NOT VALID. | — | CO | 208 | View → |
| X27 | THERE IS NO ADMISSION DIAGNOSIS LISTED FOR THIS PROCEDURE. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| X272 | AMBULANCE CLAIM BILLED ON A HCFA REQUIRES A VALID PICK UP LOCATION ZIP CODE. |
N53
Missing/incomplete/invalid point of pick-up address. |
CO | 16 | View → |
| X28 | THERE IS NO PRINCIPAL DIAGNOSIS LISTED FOR THIS PROCEDURE. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X29 | THE PRINCIPAL DIAGNOSIS CODE IS NON-EXEMPT AND REQUIRES A VALID POA INDICATOR. |
N434
Missing/Incomplete/Invalid Present on Admission indica… |
CO | 16 | View → |
| X296 | Co-Surgeon modifier 62 indicates a 50% reduction of the state maximum shoud be applied. | — | CO | 45 | View → |
| X297 | Co-Surgeon modifier 62 not applicable for procedure code. Line item not reimbursed. |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| X299 | Assistant Surgeon modifier not applicable for procedure code. Line item not reimbursed. |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| X3 | OTHER DIAGNOSIS: THE OTHER DIAGNOSIS IS INVALID OR DISABLED. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X30 | THE OTHER DIAGNOSIS CODE IS NON-EXEMPT AND REQUIRES A VALID POA INDICATOR. |
N434
Missing/Incomplete/Invalid Present on Admission indica… |
CO | 16 | View → |
| X300 | Lab Panel reduction applied to line item. | — | CO | 45 | View → |
| X301 | Code is part of Panel billed on same day. Line item not reimbursed. |
M15
Separately billed services/tests have been bundled as … |
CO | 97 | View → |
| X302 | The Procedure code is reimbursed under an alternate therapy procedure code for therapists. The Proc… |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| X303 | Modifier 26 billed for a code that does not have a professional component per the fee schedule. |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| X305 | UNITS EXCEEDS STATE MAXIMUM ALLOWED. |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 96 | View → |
| X306 | Dasa Services billed with unacceptable primary diagnosis. Acceptable primary diagnosis codes: F10-F… |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X307 | HOSPICE (K17): Hospice Services provided for 61 or more days. Rates for Routine Home Care will be … | — | CO | 203 | View → |
| X308 | HOSPICE (K16): Service Intensity Add-on Billing Invalid: 1. 055X or 056X is billed but the Pati… |
MA43
Missing/incomplete/invalid patient status. |
CO | 16 | View → |
| X309 | HOSPICE: REVENUE CODE(S) REQUIRES THAT VALUE CODE SPECIFYING THE CORE BASED STATISTIC AREA (CBSA). |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
CO | 16 | View → |
| X31 | THE PRINCIPAL PROCEDURE CODE IS INVALID OR DISABLED. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X310 | Dasa Services require a Value Code of 80 specifying the number of covered treatment days. |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
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.