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 | |
|---|---|---|---|---|---|
| X362 | EAPG- MODIFIER REPORTED FOR THIS CODE IS SUPPRESSING NCCI EDIT. REVIEW DOCUMENTATION TO DETERMINE I… |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 97 | View → |
| X363 | EAPG- Revenue code reported requires Reason for Visit diagnosis code. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| X364 | EAPG- Modifier 59 is reported. Consider reporting modifier XE, XP, XS, or XU instead if more approp… |
N519
Invalid combination of HCPCS modifiers. |
CO | 16 | View → |
| X365 | EAPG- Units of service for ancillary observation hours must be reported in the range of 8 to 24 hou… |
M53
Missing/incomplete/invalid days or units of service. |
CO | 16 | View → |
| X367 | EAPG- This mutually exclusive code is paired with another code to trigger edit 3019. |
M80
Not covered when performed during the same session/dat… |
CO | 97 | View → |
| X368 | EAPG- This mutually exclusive code is paired with another code to trigger edit 3020. |
M80
Not covered when performed during the same session/dat… |
CO | 231 | View → |
| X369 | EAPG- This mutually exclusive code is paired with another code to trigger edit 3039. | — | CO | 231 | View → |
| X37 | PROCEDURE CODE IS NON-COVERED. THE NO EXEMPTION CODE IS PRESENT ON CLAIM |
N643
The services billed are considered Not Covered or Non-… |
CO | 96 | View → |
| X370 | EAPG- This Column 1 code is paired with a Column 2 code to trigger edit 3040. | — | CO | 231 | View → |
| X371 | EAPG- Corneal transplant coded. Ensure that if appropriate, acquisition of the corneal tissue is al… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X372 | EAPG- Transfusion is coded. Ensure that blood and blood products transfused are also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X373 | EAPG- Brachytherapy is coded. Ensure that brachytherapy seeds or radioelement is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X374 | EAPG- Nuclear medicine is coded. Ensure that radiopharmaceuticals used in nuclear medicine procedur… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X375 | EAPG- Infusion therapy is coded. Ensure that the substance infused is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X376 | EAPG- Chemotherapy is coded. Ensure that chemotherapeutic agents and other supportive drugs are als… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X377 | EAPG- Vaccination is coded. Ensure that the vaccine administered is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X378 | EAPG- Injection is coded. Ensure that the substance injected is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X379 | EAPG- Lens implant is coded. Ensure that the intraocular lens is also coded if applicable. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X38 | PROCEDURE CODE IS NON-COVERED. |
N643
The services billed are considered Not Covered or Non-… |
CO | 96 | View → |
| X380 | EAPG- Neurostimulator implantation is coded. Ensure that the neurostimulator is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X381 | EAPG- Insertion of prosthesis is coded. Ensure that the penile prosthesis is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X382 | EAPG- Radiology procedure with contrast is coded. Ensure that the contrast material is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X383 | EAPG- Interventional radiology procedure is coded. Ensure that the surgical intervention is also co… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X384 | EAPG- A 3D rendering radiology procedure is coded. Ensure that the base radiology procedure is also… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X385 | EAPG- Surgical placement of device for clinical brachytherapy has been coded. Ensure that applicat… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X386 | EAPG- Skin substitute is coded. Ensure that application of the skin substitute is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X387 | EAPG - NCCI Medicaid FAC - Procedure code pair conflict is allowed if an appropriate NCCI modifier … |
N519
Invalid combination of HCPCS modifiers. |
CO | 16 | View → |
| X388 | Corneal tissue processing reported without cornea transplant procedure |
N525
These services are not covered when performed within t… |
CO | 234 | View → |
| X389 | Biosimilar HCPCS reported without biosimilar modifier |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| X390 | Partial hospitalization claim span is equal to or more than 4 days with insufficient number of hour… |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | View → |
| X391 | Partial hospitalization interim claim from and through dates must span more than 4 days |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | View → |
| X392 | Partial hospitalization services are required to be billed weekly | — | CO | 16 | View → |
| X393 | Claim with pass-through device, drug or biological lacks required procedure |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X394 | Claim with pass-through or non-pass-through drug or biological lacks OPPS payable procedure |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X396 | Service is not separately billable for RHC/FQHC patients. |
N390
This service/report cannot be billed separately. |
CO | 97 | View → |
| X397 | Procedure code was billed with more than one assistant surgeon. Only one surgical assistant is all… | — | CO | 54 | View → |
| X398 | Procedure code is not typical for a patient's gender. |
MA39
Missing/incomplete/invalid gender. |
CO | 7 | View → |
| X399 | Procedure code is not typical for a patient's age. |
N129
Not eligible due to the patient's age. |
CO | 6 | View → |
| X4 | THE PATIENT AGE IS INVALID |
N129
Not eligible due to the patient's age. |
CO | 6 | View → |
| X40 | PROCEDURE CODE IS LIMITED COVERAGE OR IS ASSOCIATED WITH A LIMITED COVERAGE DIAGNOSIS CODE ON THE C… |
N657
This should be billed with the appropriate code for th… |
CO | 11 | View → |
| X400 | Procedure code typically does not require an assistant surgeon. | — | CO | 54 | View → |
| X401 | Procedure code is allowed 1 unit per 6 rolling months for same provider/same diagnosis. |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | View → |
| X402 | T1015 procedure code must be billed as the first procedure code on the claim. |
N182
This claim/service must be billed according to the sch… |
CO | 16 | View → |
| X403 | Claim does not contain the appropriate ER, observation or psychiatric clinic services for Illinois … |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X404 | Bill type is incompatible with with revenue codes and/or services being billed. |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| X405 | DOS must be no more than 7 days prior to the date of death. |
N330
Missing/incomplete/invalid patient death date. |
CO | 16 | View → |
| X406 | Home Health services provided outside of Indiana are non-covered services. |
N424
Patient does not reside in the geographic area require… |
CO | 96 | View → |
| X408 | Outpatient services performed three days prior to inpatient admission. | — | CO | 60 | View → |
| X409 | Procedure code is not appropriate for place of service. |
N428
Not covered when performed in this place of service. |
CO | 5 | View → |
| X41 | ICD-10: PROCEDURE CODE IS LIMITED COVERAGE OR IS ASSOCIATED WITH A LIMITED COVERAGE DIAGNOSIS CODE … |
N657
This should be billed with the appropriate code for th… |
CO | 11 | 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.