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 | |
|---|---|---|---|---|---|
| HH90 | HOME HEALTH SERVICES ARE LIMITED TO 90 VISITS WITHIN A TWELVE MONTH PERIOD |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| HHDM | HOME HEALTH SERVICES REQUIRE PRIOR AUTH AFTER 32 UNITS HAVE BEEN EXCEEDED. |
M62
Missing/incomplete/invalid treatment authorization cod… |
CO | 197 | View → |
| HHFA | SERVICES SHOULD BE BILLED ON HCFA. |
N34
Incorrect claim form/format for this service. |
CO | 16 | View → |
| HHV | HOME HEALTH VISITS: 1 visit per day, if the CPT code is not listed in the contract it is not paid. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| HMSC | HMS WILL RECOUP DUE TO COB |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| HPCF | HFS - member was not found on Patient Credit File (PCF), therefore services are denied. |
MA43
Missing/incomplete/invalid patient status. |
CO | 177 | View → |
| HPPE | SERVICE NOT PAYABLE WHEN BILLED ON THE SAME CLAIM AS HOSPICE PRE-ELECTION EVAULATION AND COUNSELING. |
N20
Service not payable with other service rendered on the… |
CO | 97 | View → |
| HSPE | PAYMENT IS MADE FOR ONLY ONE CATEGORY OF HOSPICE CARE ON A PARTICULAR DAY. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 222 | View → |
| I10 | PLACE OF SERVICE MAY BE INAPPROPRIATE FOR TREATMENT. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 5 | View → |
| I14 | PROCEDURE IDENTIFIED AS EXCLUSIVE WITH ANOTHER PROCEDURE. PATIENT IS NOT RESPONSIBLE FOR BALANCE. | — | CO | 231 | View → |
| I15 | PROCEDURE IDENTIFIED AS INCIDENTAL TO ANOTHER PROCEDURE. PATIENT IS NOT RESPONSIBLE FOR BALANCE. |
N19
Procedure code incidental to primary procedure. |
CO | 97 | View → |
| I16 | CPT/HCPC CODE IS UNLISTED. PLEASE RESUBMIT WITH VALID CODE. PLEASE INCLUDE COPY OF INVOICE IF APP… |
M81
You are required to code to the highest level of speci… |
CO | 189 | View → |
| I5 | CPT TO ANESTHESIA CROSSWALK CANNOT BE DETERMINED WITHOUT DOCUMENTATION. PLEASE RESUBMIT. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| I7 | PROCEDURE IS TYPICALLY ELECTIVE IN NATURE. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 204 | View → |
| IA11 | ASSISTANT SURGEON NOT REQUIRED FOR THIS PROCEDURE. | — | CO | 54 | View → |
| IA51 | THE T1015 ENCOUNTER CODE MUST BE BILLED FIRST IN SEQUENCE. | — | CO | 16 | View → |
| IAD | INVALID ADMIT DIAGNOSIS. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IAD1 | The Admit Diagnosis code is invalid and not found on the table of valid ICD-9 CM Codes. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IAD2 | The Admit Diagnosis code is invalid: Invalid code, unnecessary 4th/5th digit. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IAD3 | The Admit Diagnosis code is invalid: missing 4th/5th digit. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IAD4 | Admit Diagnosis code invalid: Code invalid; found on ICD-9-CM table, but not valid for patient's ad… |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IAD5 | The Admit Diagnosis code is invalid: Invalid code for date of admission, unnecessary 4th/5th digit. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IAD6 | Admit Diagnosis code invalid: Invalid code for date of admission, missing 4th/5th digit. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IADM | INVALID ADMIT DIAGNOSIS. MISSING NECESSARY ADDITIONAL DIGITS. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IADU | INVALID ADMIT DIAGNOSIS. INCLUDES UNNECESSARY DIGITS. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| IAMB | A0425 DENIED IF BILLED WITHOUT A0428 OR A0429 | — | CO | B15 | View → |
| IANE | PROCEDURE BILLED BY A PROVIDER NOT LISTED AS ANESTHESIA PROVIDER. |
N95
This provider type/provider specialty may not bill thi… |
CO | 8 | View → |
| IANM | ANESTHESIA CODE REQUIRES APPROPRIATE MODIFIER | — | CO | 4 | View → |
| IAO | PROCEDURE IS AN ADD-ON CODE AND MUST BE BILLED WITH THE PRIMARY PROCEDURE. |
N122
Add-on code cannot be billed by itself. |
CO | 97 | View → |
| IASC | PRIMARY SURGICAL PROCEDURE TYPICALLY PERFORMED IN AN AMBULATORY SURGICAL CENTER. |
N34
Incorrect claim form/format for this service. |
CO | 5 | View → |
| IASD | More than one anesthesia procedure has been billed for the same date of service. Only the anesthesi… | — | CO | 59 | View → |
| IASH | ONLY HIGHER BASE UNIT VALUE ANESTHESIA CODE SHOULDE BE BILLED PER PROCEDURE. | — | CO | 59 | View → |
| IB | PLEASE SUBMIT ITEMIZED BILL |
N26
Missing itemized bill/statement. |
CO | 163 | View → |
| IBDS | SERVICE DATE IS MISSING, INVALID, OR NOT WITHIN THE DATE SPAN ON CLAIM. |
MA31
Missing/incomplete/invalid beginning and ending dates … |
CO | 16 | View → |
| IBFR | FREQUENCY DOES NOT MEET POLICY REQUIREMENTS FOR THIS PROCEDURE |
N435
Exceeds number/frequency approved /allowed within time… |
CO | 119 | View → |
| IBPR | Bilateral payment adjustment has been applied to the claim. |
N644
Reimbursement has been made according to the bilateral… |
CO | 59 | View → |
| IBPS | PLACE OF SERVICE MISSING OR INVALID. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 58 | View → |
| IBSP | Procedure Code is not typically performed by a physician at the billed Place of Service. |
M77
Missing/incomplete/invalid/inappropriate place of serv… |
CO | 16 | View → |
| ICA | CA MODIFIER REQUIRES PATIENT STATUS CODE 20. |
MA43
Missing/incomplete/invalid patient status. |
CO | 16 | View → |
| ICAG | PROCEDURE IS INCONSISTENT WITH THE PATIENT'S AGE. |
N517
Resubmit a new claim with the requested information. |
CO | 9 | View → |
| ICCA | The condition code on the claim is invalid. |
M44
Missing/incomplete/invalid condition code. |
CO | 16 | View → |
| ICCP | PROCEDURE IS A COMPONENT OF A COMPREHENSIVE PROCEDURE AND SHOULD BE DENIED. |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| ICDL | PROCEDURE CODE HAS BEEN DELETED. |
N517
Resubmit a new claim with the requested information. |
CO | 181 | View → |
| ICM | DIAGNOSIS MISSING, INVALID, OR TOO NON-SPECIFIC |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| ICON | CONDITION CODE MISSING/INVALID/OR REQUIRES REVIEW. |
M44
Missing/incomplete/invalid condition code. |
CO | 16 | View → |
| ICOS | Procedure is typically considered cosmetic. Please submit claim documentation. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 204 | View → |
| ICPD | THE CP CODE BILLED IS DUPLICATIVE OF THE E & M CODE BILLED IN THE PATIENT'S HISTORY. |
M86
Service denied because payment already made for same/s… |
CO | 97 | View → |
| ICPT | PROCEDURE CODE IS INVALID, MISSING OR DISABLED. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| ICSX | PROCEDURE INCONSISTENT WITH PATIENT'S GENDER. |
N517
Resubmit a new claim with the requested information. |
CO | 7 | View → |
| IDAC | Age conflict; patient's age and diagnosis code are inconsistent. |
N517
Resubmit a new claim with the requested information. |
CO | 9 | 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.