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 | |
|---|---|---|---|---|---|
| NDDC | NAME OF RENDERING PHYSICIAN AND RENDERING NPI IS REQUIRED FOR CLAIM PROCESSING. PLEASE RESUBMIT WI… |
N289
Missing/incomplete/invalid rendering provider name. |
CO | 16 | View → |
| NEAP | SERVICES NOT BILLED WITH APL CODE. SERVICES MUST BE BILLED ON HCFA. |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| NEG | THIS IS A NEGOTIATED DISCOUNT. YOU ARE NOT RESPONSIBLE FOR THIS AMOUNT. | — | CO | 131 | View → |
| NEM | Non-Emergency Transportation is not covered services under Hoosier Healthwise Package C benefits. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| NEUR | MUST BILL NEUROSTIMULATOR IMPLANT DEVICE |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| NEW | NEWBORN CHARGES HAVE BEEN PROCESSED UNDER THE MOTHER'S ID. |
M15
Separately billed services/tests have been bundled as … |
CO | 97 | View → |
| NHLD | ADMINISTRATIVE HOLD REMOVED. CLAIM RECONSIDERED. |
N10
Adjustment based on the findings of a review organizat… |
CO | 169 | View → |
| NIB | PLEASE SUBMIT AN ITEMIZED BILLTO: MAINE COMMUNITY HEALTH OPTIONS, MAIL STOP 200, PO BOX 1121, LEWIS… |
N26
Missing itemized bill/statement. |
CO | 163 | View → |
| NID | THE ORIGINAL CLAIM WAS PROCESSED UNDER AN INVALID ID#. THIS EOP CONTAINS BOTH A NEGATIVE PAYMENT A… |
MA130
Your claim contains incomplete and/or invalid informat… |
CO | 129 | View → |
| NMOB | NON-MEDICALLY NECESSARY DELIVERY PRIOR TO 39 WEEKS GESTATION. |
N174
This is not a covered service/procedure/ equipment/bed… |
CO | 50 | View → |
| NPI | PROVIDER NPI NUMBER IS MISSING AND/OR THE NPI NUMBER SUBMITTED DOES NOT BELONG TO THE PROVIDER ON T… | — | CO | 206 | View → |
| NPIN | INDIVIDUAL PROVIDER NPI NUMBER DOES NOT MATCH NAME OF PROVIDER BILLED PER NPPES. | — | CO | 206 | View → |
| NPP | ALL EXCLUDED SERVICES SHALL BE PROVIDED BY NETWORK/PARTICIPATING PROVIDER, WHO MUST BILL DIRECTLY F… |
N174
This is not a covered service/procedure/ equipment/bed… |
CO | 96 | View → |
| NUB | INCORRECT BILL TYPE, PLEASE RESUBMIT ON A CMS 1500 FORM. PER HFS CLINICAL VISITS SHOULD NOT BE BILL… |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| NUC | MUST BILL RADIOPHARMECEUTICAL PROCEDURE WITH NUCLEAR MEDICINE PROCEDURE |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| NUNA | SERVICES DENIED. NUTRITIONAL COUNSELING NOT AUTHORIZED. | — | CO | 167 | View → |
| OBEA | OBSERVATION UNITS NOT BEING BILLED CORRECTLY PER HFS GUIDELINES. |
M53
Missing/incomplete/invalid days or units of service. |
CO | 16 | View → |
| OBNC | OBSERVATION CLAIM NOT BILLED PER HFS BILLING GUIDELINES EFFECTIVE 01/01/2017. |
M20
Missing/incomplete/invalid HCPCS. |
CO | 16 | View → |
| OBPM | PRIOR AUTH IS REQUIRED AFTER 3 SERVICES WITHIN EPISODE OF CARE. |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| OBSD | PAYMENT WILL NOT BE ALLOWED FOR OBSERVATION CARE FOR CONSECUTIVE DATES OF SERVICE. ALSO, ONLY ONE O… |
N435
Exceeds number/frequency approved /allowed within time… |
CO | 96 | View → |
| OBU3 | Prior authorization is required after three services within episode of care. |
N761
This provider is not authorized to receive payment for… |
CO | 197 | View → |
| OCU | MUST BILL OCCULAR PROSTHESIS WITH IMPLANT PROCEDURE |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| OERD | DIALYSIS REVENUE CODE CANNOT BE BILLED WITH ER OR OBSERVATION SERVICES. |
M50
Missing/incomplete/invalid revenue code(s). |
CO | 16 | View → |
| OMID | MISSING OR INVALID MEDICAID ID FOR ORDERING PROVIDER BILLED | — | CO | 256 | View → |
| ONMC | PROCESSED IN ACCORDANCE WITH OUT OF NETWORK REIMBURSEMENT RULES. SERVICES WITH NO ASSIGNED FEE OR … | — | CO | 59 | View → |
| OONC | PAID IN ACCORDANCE WITH THE HEALTH PLANS OUT OF NETWORK RULES | — | CO | 59 | View → |
| OPNF | Ordering Provider Not Found |
N265
Missing/incomplete/invalid ordering provider primary i… |
CO | 206 | View → |
| ORAU | PRE-AUTHORIZATION REQUIRED FOR ORTHOTICS BILLED CHARGES $250.00 OR MORE |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| ORTH | ORTHOTICS REVIEW. PA REQUIRED IF TOTAL CLAIM IS GREATER THAN $250. |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| OS2 | PREAUTHORIZATION REQUIRED FOR OUT OF NETWORK SERVICES. |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| OT10 | BILLABLE BY FQHC/RHC/ENCOUNTER RATE CLINIC ONLY. NOT BILLING WITH APPROPRIATE ADDRESS/NPI. | — | CO | 272 | View → |
| P01 | PROVIDER NOT ELIGIBLE FOR CATEGORY OF SERVICE. |
N238
Incomplete/invalid physician certified plan of care. |
CO | B7 | View → |
| P03 | PROVIDER NOT ENROLLED FOR CATEGORY OF SERVICE OR DATE OF SERVICE. IF THERE IS A DISCREPANCY, PLEASE… |
N238
Incomplete/invalid physician certified plan of care. |
CO | B7 | View → |
| PANC | PATIENT IS OUTSIDE THE AGE LIMITATIONS FOR THIS PROCEDURE. |
N129
Not eligible due to the patient's age. |
CO | 6 | View → |
| PC01 | SERVICES NOT PROVIDED OR AUTHORIZED BY DESIGNATED PCP (PRIMARY CARE PROVIDER) |
N450
Covered only when performed by the primary treating ph… |
CO | 242 | View → |
| PCMX | PROCESSED PER PARTICIPATING CONTRACT OR FEE SCHEDULE |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| PCP | SERVICES NOT PROVIDED OR AUTHORIZED BY DESIGNATED PCP (PRIMARY CARE PROVIDER) | — | CO | 242 | View → |
| PD | PER DIEM RATE PAID |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 59 | View → |
| PE | PRIMARY INSURANCE PAYMENT IS GREATER THAN OR EQUAL TO HFS/IL MEDICAID PAYABLE BENEFIT. NO ADDITIONA… | — | CO | 45 | View → |
| PE51 | SERVICE MUST BE BILLED WITH AN APPROPRIATE REVENUE CODE TO BE ELIGIBLE FOR EAPG REIMBURSEMENT. |
M50
Missing/incomplete/invalid revenue code(s). |
CO | 16 | View → |
| PEAP | CLAIM HAS BEEN PRICED PER EAPG CALCULATION. |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| PHV | CLAIM HAS BEEN MISDIRECTED FOR NON-PHARMACY SERVICES. | — | CO | 109 | View → |
| PI | PAYMENT FOR SERVICES INCLUDED AS PART OF PER DIEM/DRG |
M15
Separately billed services/tests have been bundled as … |
CO | 97 | View → |
| PID | PRIMARY INSURANCE'S EOB IS LACKING DENIAL REASON FOR NON-PAYMENT OF CLAIM. |
MA04
Secondary payment cannot be considered without the ide… |
CO | 16 | View → |
| PNV | PRENATAL VISIT IS ONLY PAYABLE WITH CODE 0502F. |
M20
Missing/incomplete/invalid HCPCS. |
CO | 181 | View → |
| PO | VERIFY PLACE OF SERVICE AND/OR CPT CODES. INCONSISTANT WITH RELATED CHARGES AND/OR AUTHORIZATION. | — | CO | 58 | View → |
| POAI | THE POA INDICATOR SUBMITTED IS INVALID. PLEASE REVIEW ALL ICD10 CODE FOR POA APPLICABILITY. THIS … |
N434
Missing/Incomplete/Invalid Present on Admission indica… |
CO | 16 | View → |
| POAM | POA INDICATORS ARE REQUIRED. PLEASE REVIEW ALL ICD10 CODES FOR POA APPLICABILITY. THIS CLAIM CANN… |
N434
Missing/Incomplete/Invalid Present on Admission indica… |
CO | 16 | View → |
| POD | PODIATRIC SERVICES REQUIRE PA AFTER 6 VISITS |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| PODI | INITIAL VISIT ONLY COVERED ONCE PER PATIENT PER PROVIDER OR PROVIDER GROUP |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | 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.