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 | |
|---|---|---|---|---|---|
| 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| X318 | EAPG- From date is out of date range for grouper.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 → |
| X336 | EAPG- Sex conflict - procedure only valid for female patients. May require condition code 45 and m… | — | CO | 7 | View → |
| X338 | EAPG- From date is invalid or blank. This is a required field. |
M52
Missing/incomplete/invalid 'from' date(s) of service. |
CO | 16 | View → |
| X339 | EAPG- Through date is invalid or blank. This is a required field. |
M59
Missing/incomplete/invalid 'to' date(s) of service. |
CO | 16 | View → |
| X34 | THE OTHER PROCEDURE CODE IS NOT TYPICAL FOR THIS PATIENT GENDER. |
M67
Missing/incomplete/invalid other procedure code(s). |
CO | 16 | View → |
| X340 | EAPG- Line item service date is invalid or blank. This is a required field. |
N301
Missing/incomplete/invalid procedure date(s). |
CO | 16 | View → |
| X341 | EAPG- Line item service date is not within the from-through dates. |
MA31
Missing/incomplete/invalid beginning and ending dates … |
CO | 16 | View → |
| X342 | EAPG- From date cannot be after through date. |
M52
Missing/incomplete/invalid 'from' date(s) of service. |
CO | 16 | View → |
| X343 | EAPG- Terminated bilateral procedure. Do not use modifier -50 when reporting a terminated procedure. |
N519
Invalid combination of HCPCS modifiers. |
CO | 16 | View → |
| X344 | EAPG- Terminated bilateral procedure. Do not use modifier -50 when reporting a terminated procedure. |
N519
Invalid combination of HCPCS modifiers. |
CO | 16 | View → |
| X345 | EAPG- Primary or principal diagnosis code is blank; must be a valid code. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| X346 | EAPG- Type of bill is invalid, may affect claim processing. |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| X347 | EAPG- Duplicate lab or pathology code. Add modifier 59, 91, XE, XP, XS, or XU if documentation supp… |
M86
Service denied because payment already made for same/s… |
CO | 18 | View → |
| X349 | EAPG- Duplicate radiology code. Add modifier if documentation supports use to differentiate service… |
M86
Service denied because payment already made for same/s… |
CO | 18 | View → |
| X35 | PROCEDURE CODE IS NON-COVERED. THE BENEFICIARY IS OVER AGE 60. |
N129
Not eligible due to the patient's age. |
CO | 96 | View → |
| X350 | EAPG- PRESENCE OF AN ANATOMIC SITE MODIFIER/OR CODE(s) IS SUPPRESSION NCCI EDIT. CHECK DOCUMENTATIO… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X351 | EAPG- Presence of the same anatomic site modifier and code(s) is suppressing NCCI edit. Check docum… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X352 | EAPG- Inherent bilateral code, report code once. Do not report with modifier -50. |
N644
Reimbursement has been made according to the bilateral… |
CO | 4 | View → |
| X353 | EAPG- Multiple E/M codes same day without modifier -27. Evaluate adding to second and subsequent E/… |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| X354 | EAPG- Inherent bilateral procedure. Consider removing modifier -50 from this code. |
N644
Reimbursement has been made according to the bilateral… |
CO | 4 | View → |
| X355 | EAPG- Duplicate lab or pathology code. Add modifier 59, 91, XE, XP, XS, or XU if documentation sup… |
M86
Service denied because payment already made for same/s… |
CO | 18 | View → |
| X357 | EAPG- ADD ON CODE REPORTED WITHOUT BASE PROCEDURE. |
M20
Missing/incomplete/invalid HCPCS. |
CO | 16 | View → |
| X358 | EAPG- Modifier -25 is reported for a Medical Visit EAPG with no Significant Procedure EAPG present … |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X359 | EAPG- DIAGNOSIS CODE IS REPORTED. ENSURE THAT MODIFIER PA, PB, OR PC IS ALSO REPORTED. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X36 | PROCEDURE CODE IS NON-COVERED. THE DESIGNATED DIAGNOSIS IS PRESENT. |
N569
Not covered when performed for the reported diagnosis. |
CO | 96 | View → |
| X360 | EAPG- MODIFIER PA, PB, OR PC IS REPORTED. ENSURE THAT DIAGNOSIS CODE IS ALSO REPORTED. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X361 | EAPG- Duplicate diagnostic or therapeutic procedures. Add modifier if documentation supports use t… |
M86
Service denied because payment already made for same/s… |
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.