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 | |
|---|---|---|---|---|---|
| L150 | SERVICE EXCEEDS QUANTITY LIMITATIONS. T4541 ARE LIMITED TO 150 EVERY 30 DAYS |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 119 | View → |
| L200 | SERVICE EXCEEDS QUANTITY LIMITATIONS. INCONTINENCE SUPPLIES ARE LIMITED TO 200 EVERY 30 DAYS |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 119 | View → |
| LCHG | SERVICES PAID ACCORDING TO PROVIDER CONTRACT. NO ADDITIONAL PAYMENT DUE. | — | CO | 20 | View → |
| LEOB | EOB RECEIVED IS NOT LEGIBLE. |
N479
Missing Explanation of Benefits (Coordination of Benef… |
CO | 16 | View → |
| LOA | PAID IN ACCORANCE WITH LETTER OF AGREEMENT. |
N381
Alert: Consult our contractual agreement for restricti… |
CO | P6 | View → |
| LTCI | LTC CLAIMS MUST BE BILLED ON A UB-04/837I FORMAT. |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| M26 | THE PROCEDURE CODE IS MISSING A REQUIRED MODIFIER. |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| MAML | SERVICES ARE LIMITED TO ONE BASELINE MAMMOGRAM FOR AGES 35 AND OVER; OR ONE SCREENING PER YEAR FOR … |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | View → |
| MATF | MEDICATION ASSISTED TREATMENT FREQUENCY EXCEEDED. PER HFS ONLY 1 UNIT IS ALLOWED PER 7 DAYS. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 151 | View → |
| MCSP | THE ROOM CHARGE EXCEEDS THE MOST COMMON SEMI-PRIVATE RATE FOR THIS HOSPITAL. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| MDR | CLAIM HAS BEEN MISDIRECTED. PLEASE SUBMIT CLAIM TO MIRADOR - C/O QHM ATTN: BARBARA SANCHEZ 15280 … |
N418
Misrouted claim. See the payer's claim submission ins… |
CO | 109 | View → |
| MDRD | MCHO HAS REVIEWED THE MEDICAL DOCUMENTATION PROVIDED UPON OUR REQUEST. THE MEDICAL DOCUMENTATION D… |
MA130
Your claim contains incomplete and/or invalid informat… |
CO | 129 | View → |
| MDX | SERVICES ONLY PAYABLE WITH APPROPRIATE MODIFIER(S) AND/OR DIAGNOSIS. |
MA64
Our records indicate that we should be the third payer… |
CO | 252 | View → |
| MEEC | MEMBER NOT ELIGIBLE FOR EXCEPTIONAL CARE - CLAIM DENIED. |
N30
Patient ineligible for this service. |
CO | 177 | View → |
| MEM | MEMBER ID SUBMITTED IS NOT CURRENT. PLEASE RESUBMIT WITH CORRECT MEMBER ID. |
N382
Missing/incomplete/invalid patient identifier. |
CO | 16 | View → |
| MEY | ALL LINES MUST CONTAIN EY MODIFIER. |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| MLTS | SERVICE NOT COVERED UNDER MLTSS PLAN AND/OR BY PROVIDER RENDERING SERVICES. |
N216
We do not offer coverage for this type of service or t… |
CO | 109 | View → |
| MNC | SERVICES NOT COVERED. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 204 | View → |
| MNCP | SERVICES NOT COVERED |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| MNF | SERVICES WILL BE RECONSIDERED WHEN THE INFORMATION REQUESTED FROM THE MEMBER IS RECEIVED. |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| MODF | SERVICES ONLY PAYABLE WITH APPROPRIATE MODIFIER(S). |
N572
This procedure is not payable unless appropriate non-p… |
CO | 16 | View → |
| MODI | THE MODIFIER BILLED IS INAPPROPRIATE FOR THIS CPT CODE. |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| MOR | PROPER MODIFIER IS REQUIRED IN ORDER TO CONSIDER PROCEDURE FOR BENEFITS. |
N572
This procedure is not payable unless appropriate non-p… |
CO | 16 | View → |
| MR | PLEASE SUBMIT MEDICAL RECORDS FOR CLAIM CONSIDERATION. |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| MRF | MEMBER/PROVIDER REIMBURSEMENT FORM NOT COMPLETE |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| MS | PAYMENT REDUCED FOR MULTIPLE PROCEDURES. | — | CO | 59 | View → |
| MS2 | PRE - AUTHORIZATION REQUIRED FOR MLTSS PLAN. |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| MSO | OTHER MSO LIABILITY | — | CO | 109 | View → |
| MT12 | SERVICES ARE LIMITED TO 12 MANIPULATION THERAPY VISITS PER YEAR. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| MUE | UNITS EXCEED MEDICARE'S UNLIKELY EDITS. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| MX | PROCESSED PER PARTICIPATING CONTRACT OR FEE SCHEDULE. SERVICES WITH NO ASSIGNED FEE OR WHICH ARE C… |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 45 | View → |
| N34 | INCORRECT CLAIM FORM/FORMAT FOR THIS SERVICE |
N34
Incorrect claim form/format for this service. |
CO | 16 | View → |
| N615 | ALERT: THIS ENROLLEE RECEIVING ADVANCE PAYMENTS OF THE PREMIUM TAX CREDIT IS IN THE GRACE PERIOD OF… |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| N616 | ALERT: THIS ENROLLEE IS IN THE FIRST MONTH OF THE ADVANCE PREMIUM TAX CREDIT GRACE PERIOD. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| N617 | THIS ENROLLEE IS IN THE SECOND OR THIRD MONTH OF THE ADVANCE PREMIUM TAX CREDIT GRACE PERIOD. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| N618 | ALERT: THIS CLAIM WILL AUTOMATICALLY BE REPROCESSED IF THE ENROLLEE PAYS THEIR PREMIUMS. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| NAB | ADDITIONAL INFORMATION RECEIVED AND REVIEWED. NO ADDITIONAL BENEFIT DUE. | — | CO | 193 | View → |
| NC | INVALID OR MISSING CPT4 OR HCPCS PROCEDURE CODE. THIS CLAIM CANNOT BE PROCESSED UNTIL A CORRECT CL… |
M20
Missing/incomplete/invalid HCPCS. |
CO | 16 | View → |
| NCHA | NEW CENTURY HEALTH AUTHORIZATION REQUIRED. |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| NCIS | INVESTIGATIONAL SERVICE, NOT COVERED |
N623
Not covered when deemed unscientific/unproven/outmoded… |
CO | 55 | View → |
| NCLI | RENDERING PROVIDER MUST PROVIDE CLINICAL INFORMATION FOR THESE SERVICES. PLEASE SUBMIT TO: MAINE C… |
M25
The information furnished does not substantiate the ne… |
CO | 16 | View → |
| NCMP | SERVICES NOT COVERED BY BENEFIT PLAN | — | CO | 204 | View → |
| NCON | THIS SERVICE IS NOT COVERED UNDER THE PROVIDER'S CONTRACT. THE PATIENT IS NOT RESPONSIBLE. |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 147 | View → |
| NCPV | SERVICES DO NOT MEET THE GENDER/AGE/DIAGNOSIS REQUIREMENTS FOR THE PREVENTIVE SERVICES BENEFIT. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| NCS | SERVICES NOT COVERED BY BENEFIT PLAN | — | CO | 204 | View → |
| NCUC | NOT COVERED UNDER THE TERMS OF THIS AGREEMENT | — | CO | 204 | View → |
| NCVS | NONCOVERED VISION CARE SERVICES UNDER THE PLAN. PATIENT MAY BE RESPONSIBLE UP TO BILLED CHARGES. | — | CO | 204 | View → |
| NDC | NDC NUMBER IS REQUIRED. THIS CLAIM CANNOT BE PROCESSED UNTIL A CORRECT CLAIM HAS BEEN RECEIVED. |
N56
Procedure code billed is not correct/valid for the ser… |
CO | 16 | View → |
| NDCR | THE NDC NUMBER, DRUG NAME, STRENGTH OF PRESCRIPTION AND QUANTITY IS REQUIRED TO COMPLETE REVEIW OF … |
M119
Missing/incomplete/invalid/ deactivated/withdrawn Nati… |
CO | 16 | View → |
| NDCX | HCPCS MUST BE BILLED WITH A VALID NDC NUMBER. |
M119
Missing/incomplete/invalid/ deactivated/withdrawn Nati… |
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.