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 | |
|---|---|---|---|---|---|
| IMD1 | PROCEDURE REQUIRES A REVIEW OF THE MEDICAL NECESSITY OF A SURGICAL ASSISTANT. | — | CO | 54 | View → |
| IMD2 | PROCEDURE REQUIRES A REVIEW OF THE MEDICAL NECESSITY OF TWO SURGEONS. | — | CO | 54 | View → |
| IMD3 | PROCEDURE REQUIRES A REVIEW OF THE MEDICAL NECESSITY OF A SURGICAL TEAM. | — | CO | 54 | View → |
| IMDC | MANIFESTION CODES ARE NOT ALLOWED AS THE ADMISSION DIAGNOSIS. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IMDH | This procedure code and a procedure code in patient's history indicate that multiple imaging servic… | — | CO | 134 | View → |
| IMDT | Per the Medicare Physician Fee Schedule, the submitted Procedure Code describes a diagnostic proced… |
N572
This procedure is not payable unless appropriate non-p… |
CO | 4 | View → |
| IMEO | PROCEDURE IS MUTALLY EXCLUSIVE TO ANOTHER PROCEDURE EITHER ON THIS CLAIM OR A CLAIM IN HISTORY. | — | CO | 231 | View → |
| IMFD | MAXIMUM DAILY FREQUENCY FOR PROCEDURE EXCEEDED. |
N435
Exceeds number/frequency approved /allowed within time… |
CO | 96 | View → |
| IMFH | The maximum frequency for this procedure has been exceeded between this claim and the same procedur… |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| IMFP | Charges are within the Global Follow up days of the procedure performed. |
N525
These services are not covered when performed within t… |
CO | 96 | View → |
| IMFX | MAXIMUM FREQUENCY FOR PROCEDURE EXCEEDED. |
N435
Exceeds number/frequency approved /allowed within time… |
CO | 119 | View → |
| IMGT | Per the Medicare Physician Fee Schedule the procedure code describes the global code of a service o… |
N572
This procedure is not payable unless appropriate non-p… |
CO | 4 | View → |
| IMIC | MODIFIER YZ IS NOT APPROPRIATE FOR THIS SERVCE |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| IMMV | MULTIPLE VISITS CANNOT BE BILLED ON THE SAME DAY FOR THE SAME REVENUE CODE | — | CO | 59 | View → |
| IMP | 50% REDUCTION OF ALLOWED AMOUNT APPLIED TO LINE. | — | CO | 59 | View → |
| IMP5 | OPERATIVE REPORT REQUIRED WHEN MORE THAN 5 PROCEDURES ARE PERFORMED ON SAME DATE OF SERVICE |
M29
Missing operative note/report. |
CO | 252 | View → |
| IMPC | MODIFIER XY IS NOT APPROPRIATE FOR THIS SERVICE. |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| IMPI | PHYSICIAN INTERPRETATION SERVICE NOT PAYABLE IN PLACE OF SERVICE BILLED. | — | CO | 58 | View → |
| IMPT | PHYSICAL THERAPY SERVICE NOT PAYABLE IN PLACE OF SERVICE BILLED. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 5 | View → |
| IMTC | MODIFIER BILLED IS INAPPROPRIATE AS THE PROCEDURE BILLED IS ONLY THE TECHNICAL PORTION OF THIS SERV… |
N572
This procedure is not payable unless appropriate non-p… |
CO | 4 | View → |
| IMTS | TEAM SURGERY IS NOT PERMITTED FOR THIS PROCEDURE. | — | CO | 54 | View → |
| INCD | PROCEDURE IDENTIFIED AS INCIDENTAL TO ANOTHER PROCEDURE. PATIENT IS NOT RESPONSIBLE FOR BALANCE. |
N19
Procedure code incidental to primary procedure. |
CO | 97 | View → |
| INCE | Non-covered based on statutory exclusion. |
N174
This is not a covered service/procedure/ equipment/bed… |
CO | 96 | View → |
| INCS | NOT A COVERED SERVICE UNDER THE PLAN BENEFITS. |
N174
This is not a covered service/procedure/ equipment/bed… |
CO | 96 | View → |
| INDR | INFORMATIONAL CODE ONLY. PATIENT IS NOT RESPONSIBLE FOR SERVICE | — | CO | B1 | View → |
| INFA | ASC billing needs to be billed by facility not individual provider |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| INFD | CLAIM MUST BE BILLED WITH INFUSION DRUG OR APPROPRIATE REV CODE |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| INFO | THIS IS A NON-REIMBURSABLE INFORMATIONAL CODE ONLY |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| INFX | THE PLAN DOES NOT PROVIDE BENEFITS RELATED TO INFERTILITY. |
N174
This is not a covered service/procedure/ equipment/bed… |
CO | 96 | View → |
| INJ | INJECTIONS MUST BE BILLED WITH INJECTED DRUG CODE |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| INPD | DIAGNOSIS NOT TO BE LISTED AS THE PRIMARY. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| INPT | NEW PATIENT VISIT BILLED FOR AN ESTABLISHED PATIENT; REBILL CORRECT CODE. |
m51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| INR | INTERVENTIONAL SURGERY PROCEDURE CODE MUST BE BILLED |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| INRS | HCPCS CODE BILLED IS NOT PAYABLE FOR TYPE OF BILL |
MA30
Missing/incomplete/invalid type of bill. |
CO | 282 | View → |
| INT | INTEREST PAYMENT APPLIED TO CLAIM. INITIAL PAYMENT EXCEEDED 30 DAYS. | — | CO | 225 | View → |
| INV | PLEASE SUBMIT THE M.S.R.P. OR MANUFACTUROR'S INVOICE FOR THESE SERVICES. |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| IOAP | OBSERVATION HCPCS CODE MISSING FROM CLAIM PER HFS GUIDELINES. |
M20
Missing/incomplete/invalid HCPCS. |
CO | 16 | View → |
| IOID | INVALID OTHER DIAGNOSES. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| IOIS | ONLY INCIDENTAL SERVICES WERE BILLED ON THIS CLAIM. THESE SERVICES ARE TO BE PAID AS PART OF ANOTHE… |
N122
Add-on code cannot be billed by itself. |
CO | 234 | View → |
| IORP | ALERT (ORP): Entity's National Provider Identifier (NPI). Missing or invalid information. | — | OA | 206 | View → |
| IOSR | PRIMARY SURGICAL PROCEDURE TYPICALLY PERFORMED IN AN OFFICE SETTING. |
N34
Incorrect claim form/format for this service. |
CO | 5 | View → |
| IPAT | PATIENT ID MISSING. |
N382
Missing/incomplete/invalid patient identifier. |
CO | 16 | View → |
| IPC | INVALID PROCEDURE CODE. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| IPCD | CODE NOT WITHIN APPROVAL DATE. |
N175
Missing review organization approval. |
CO | 251 | View → |
| IPCM | MODIFIER -26 IS NOT APPROPRIATE FOR THIS PROCEDURE BECAUSE THE PROCEDURE IS DEFINED AS 100% PROFESS… |
N572
This procedure is not payable unless appropriate non-p… |
CO | 4 | View → |
| IPD | INVALID PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| IPDE | E CODES ARE NOT ALLOWED AS PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| IPDI | DIAGNOSTIC INTERVIEW WILL BE DENIED AS PART OF CONSULTATION WHEN BILLED WITHIN 30 OF THAT CONSULT B… |
N174
This is not a covered service/procedure/ equipment/bed… |
CO | 96 | View → |
| IPDM | MANIFESTATION CODES NOT ALLOWED AS PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| IPDQ | PRINCIPAL DIAGNOSIS IS FOR QUESTIONABLE ADMISSION. |
MA63
Missing/incomplete/invalid principal diagnosis. |
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.