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 | |
|---|---|---|---|---|---|
| IPDS | PRINCIPAL DIAGNOSIS REQUIRES SECONDARY DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| IPDU | INVALID PROCEDURE CODE. INCLUDES UNNECESSARY ADDITIONAL DIGIT. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| IPOS | INVALID PLACE OF SERVICE SUBMITTED. SERVICES MUST BE SUBMITTED WITH A VALID TWO DIGIT CODE. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 58 | View → |
| IPRB | INPT REHAB LIMITED TO 90 DAYS PER CALENDER YEAR. |
N640
Exceeds number/frequency approved/allowed within time … |
OA | 119 | View → |
| IPRD | REDUCTION FOR ASSISTANT, CO-, OR TEAM SURGEON. | — | CO | 59 | View → |
| IPRE | PRE-OP EXAM ONE DAY PRIOR TO PROCEDURE IS PART OF THE GLOBAL SURGICAL PACKAGE AND NOT ALLOWED. |
N525
These services are not covered when performed within t… |
CO | 96 | View → |
| IPRV | MISSING PROVIDER ID. | — | CO | 206 | View → |
| IPSC | PATIENT STATUS CODE MISSING OR INVALID |
MA43
Missing/incomplete/invalid patient status. |
CO | 16 | View → |
| IPSX | PATIENT GENDER MISSING OR INVALID |
MA39
Missing/incomplete/invalid gender. |
CO | 16 | View → |
| IRRH | REVENUE CODE ALSO REQUIRES HCPCS CODE. |
M20
Missing/incomplete/invalid HCPCS. |
CO | 16 | View → |
| ISAM | ONLY ONE SURGICAL ASSISTANT IS ALLOWED FOR THIS PROCEDURE. | — | CO | 54 | View → |
| ISAS | PROCEDURE TYPICALLY DOES NOT REQUIRE A SURGICAL ASSISTANT. | — | CO | 54 | View → |
| ISBP | MEDICAID BILATERAL PAYMENT ADJUSTMENT |
N644
Reimbursement has been made according to the bilateral… |
CO | 59 | View → |
| ISDR | MEDICAID DIAGNOSTIC RADIOLOGY REDUCTION | — | CO | 59 | View → |
| ISER | MEDICAID MULTIPLE ENDOSCOPY REDUCTION | — | CO | 59 | View → |
| ISEX | The patient's gender is invalid or missing. |
MA39
Missing/incomplete/invalid gender. |
CO | 16 | View → |
| ISL | THE PROVIDER ADDRESS BILLED IS NOT A VALID SERVICE LOCATION. PLEASE RESUBMIT WITH ACTUAL SERVICE A… |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 16 | View → |
| ISMP | MEDICAID MULTIPLE PROCEDURE REDUCTION | — | CO | 59 | View → |
| ISMU | Per Medicaid Medically Unlikely Edits, the units of service billed for this procedure exceed the a… |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 96 | View → |
| ISNA | INPATIENT SEPARATE PROCEDURE NOT PAID. |
M2
Not paid separately when the patient is an inpatient. |
CO | 96 | View → |
| ISOA | MISSING/INVALID POINT OF ORIGIN |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| ISOP | The HCPCS code on this line is billed for a date of service that is not within the specified approv… |
N56
Procedure code billed is not correct/valid for the ser… |
CO | 181 | View → |
| ISPA | HCPCS DATE OF SERVICE NOT WITHIN FDA APPROVAL DATE. | — | CO | 188 | View → |
| ISSP | SERVICE IS NOT PAYABLE WHEN BILLED SEPARATELY |
N390
This service/report cannot be billed separately. |
CO | 97 | View → |
| ISTR | SURGICAL TRAY NOT BILLABLE FOR THIS PROCEDURE AND THIS PLACE OF SERVICE. |
N34
Incorrect claim form/format for this service. |
CO | 5 | View → |
| ISUB | Add-on procedure code has been submitted without an appropriate primary procedure code. |
N122
Add-on code cannot be billed by itself. |
CO | 234 | View → |
| ISUN | Per Medicaid National Correct Coding Initiative edits, Procedure Code billed has an unbundled relat… |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| ITBP | TERMINATED PROCEDURE SHOULD NOT BE BILLED AS BILATERAL. |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| ITFE | MEDICARE TIMELY FILING | — | CO | 29 | View → |
| ITOA | MISSING OR INVALID TYPE OF ADMISSION |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| ITOB | TYPE OF BILL CODE IS MISSING OR INVALID FOR PLACE OF SERVICE BILLED. |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| ITPR | THESE CHARGES ARE PENDING UNTIL WE RECEIVE A POLICE REPORT WITH PROOF OF IDENTITY THEFT. | — | CO | 224 | View → |
| ITRA | PROCEDURE MAY BE REBUNDLED TO A DIFFERENT CODE. |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| ITRC | TRAUMA REVENUE AND PROCEDURE CODES REQUIRED FOR CRITICAL CARE. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| IUB | PROCEDURE HAS UNBUNDLE RELATIONSHIP WITH ANOTHER PROCEDURE. |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| IUBP | Units greater than one for bilateral procedure billed with modifier 50 are not appropriate |
N644
Reimbursement has been made according to the bilateral… |
CO | 59 | View → |
| IUNB | Procedure code billed has either an incidental, exclusive, or unbundle relationship with the proced… |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| IUNL | PROCEDURE CODE IS AN UNLISTED CODE. PLEASE SUBMIT DOCUMENTATION FOR REVIEW OF PROCEDURE PERFORMED. |
M81
You are required to code to the highest level of speci… |
CO | 189 | View → |
| IUOR | CODE ALLOWED IF ON DIFFERENT PARTS OF BODY . |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| IUPD | DIAGNOSIS IS UNACCEPTABLE AS PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| IVAC | VACCINE CODES MUST BE BILLED IN CORRECT ORDER. |
N349
The administration method and drug must be reported to… |
CO | 16 | View → |
| IVAL | INVALID VALUE CODE |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
CO | 16 | View → |
| J135 | BILLED UNDER INCORRECT TAX IDENTIFICATION NUMBER. |
N209
Missing/incomplete/invalid taxpayer identification num… |
CO | 16 | View → |
| J146 | RECOUPMENT REQUIRED. CLAIMS PAID BY PRIMARY INSURANCE, MEDICARE. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| J18 | RECOUPMENT MADE DUE TO CLAIM PAID IN ERROR |
M86
Service denied because payment already made for same/s… |
CO | 96 | View → |
| J226 | RECOUPMENT MADE FOR INTEREST PAID IN ERROR | — | CO | 45 | View → |
| JBIL | RECOUPMENT HAS BEEN MADE DUE TO BILLING ERROR. |
M81
You are required to code to the highest level of speci… |
CO | 16 | View → |
| JC18 | RECOUPMENT DUE TO DUPLICATE CLAIM/SERVICE. |
M86
Service denied because payment already made for same/s… |
CO | 96 | View → |
| JCCC | RECOUPMENT MADE DUE TO RECEIPT OF CORRECTED CLAIM AND/OR ADDITIONAL INFORMATION FROM PROVIDER. |
MA67
Alert: Correction to a prior claim. |
CO | 129 | View → |
| JCFS | RECOUPMENT HAS BEEN MADE DUE TO AN UPDATE TO THE PROVIDER'S FEE SCHEDULE WHICH NOW RESULTED IN AN O… | — | CO | 45 | 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.