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 | |
|---|---|---|---|---|---|
| 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 → |
| X311 | PROCEDURE CODE REQUIRES THAT AN NDC MUST BE BILLED ACCORDING TO NDC BILLING GUIDELINES. |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
CO | 16 | View → |
| X312 | EAPG- EXTERNAL CAUSE OF MORBIDITY CODE CANNOT BE USED AS PRIMARY OR PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X313 | EAPG- INVALID PROCEDURE CODE. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X314 | EAPG- SERVICE CONSIDERED AN INPATIENT PROCEDURE. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X315 | EAPG - NCCI MEDICARE FAC - PROCEDURE CODE PAIR CONFLICT. COMBINATION IS NOT ALLOWED EVEN IF APPROP… |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X316 | EAPG- MEDICAL VISITS REPORTED WITHOUT MODIFIER -25 OR -27 ON THE SAME DAY AS A SIGNIFICANT PROCEDUR… |
N519
Invalid combination of HCPCS modifiers. |
CO | 16 | View → |
| X317 | EAPG- MODIFIER IS INVALID. |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| X318 | EAPG- From date is out of date range for grouper. |
N301
Missing/incomplete/invalid procedure date(s). |
CO | 16 | View → |
| X319 | EAPG- Invalid age. |
N329
Missing/incomplete/invalid patient birth date. |
CO | 16 | View → |
| X32 | THE OTHER DIAGNOSIS CODE IS INVALID OR DISABLED. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X320 | EAPG- Invalid sex. |
MA39
Missing/incomplete/invalid gender. |
CO | 16 | View → |
| X321 | EAPG- REVENUE CODE IS INVALID. |
M50
Missing/incomplete/invalid revenue code(s). |
CO | 16 | View → |
| X322 | EAPG- REVENUE CODE IS REQUIRES HCPCS CODE ON SAME LINE. |
M20
Missing/incomplete/invalid HCPCS. |
CO | 16 | View → |
| X323 | EAPG- UNITS OF SERVICE GREATER THAN ONE IS INAPPROPRIATE FOR BILATERAL PROCEDURE REPORTED WITH MODI… |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 96 | View → |
| X324 | EAPG- Invalid diagnosis code, 4th or 5th digit required. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| X325 | EAPG- Invalid diagnosis code. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X326 | EAPG- Age conflict - diagnosis considered only for newborns, age <1 year. |
N657
This should be billed with the appropriate code for th… |
CO | 9 | View → |
| X327 | EAPG- Age conflict - diagnosis considered only for pediatric patients, age <18 years |
N657
This should be billed with the appropriate code for th… |
CO | 9 | View → |
| X328 | EAPG- Age conflict - diagnosis considered only for maternity, females 12-55 years. |
N657
This should be billed with the appropriate code for th… |
CO | 9 | View → |
| X329 | EAPG- Age conflict - diagnosis considered only for adults, age 15 and up. |
N657
This should be billed with the appropriate code for th… |
CO | 9 | View → |
| X33 | THE PRINCIPAL PROCEDURE CODE IS NOT TYPICAL FOR THIS PATIENT GENDER. |
MA39
Missing/incomplete/invalid gender. |
CO | 16 | View → |
| X330 | EAPG- Sex conflict - diagnosis code is only valid for male patients. May require condition code 45… | — | CO | 10 | View → |
| X332 | EAPG- Sex conflict - diagnosis code is only valid for female patients. May require condition code … | — | CO | 10 | View → |
| X334 | EAPG- Sex conflict - procedure only valid for male patients. May require condition code 45 and mod… | — | CO | 7 | 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.