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 | |
|---|---|---|---|---|---|
| X385 | EAPG- Surgical placement of device for clinical brachytherapy has been coded. Ensure that applicat… |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X386 | EAPG- Skin substitute is coded. Ensure that application of the skin substitute is also coded. |
M84
Medical code sets used must be the codes in effect at … |
CO | 16 | View → |
| X387 | EAPG - NCCI Medicaid FAC - Procedure code pair conflict is allowed if an appropriate NCCI modifier … |
N519
Invalid combination of HCPCS modifiers. |
CO | 16 | View → |
| X388 | Corneal tissue processing reported without cornea transplant procedure |
N525
These services are not covered when performed within t… |
CO | 234 | View → |
| X389 | Biosimilar HCPCS reported without biosimilar modifier |
N517
Resubmit a new claim with the requested information. |
CO | 4 | View → |
| X390 | Partial hospitalization claim span is equal to or more than 4 days with insufficient number of hour… |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | View → |
| X391 | Partial hospitalization interim claim from and through dates must span more than 4 days |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | View → |
| X392 | Partial hospitalization services are required to be billed weekly | — | CO | 16 | View → |
| X393 | Claim with pass-through device, drug or biological lacks required procedure |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X394 | Claim with pass-through or non-pass-through drug or biological lacks OPPS payable procedure |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X396 | Service is not separately billable for RHC/FQHC patients. |
N390
This service/report cannot be billed separately. |
CO | 97 | View → |
| X397 | Procedure code was billed with more than one assistant surgeon. Only one surgical assistant is all… | — | CO | 54 | View → |
| X398 | Procedure code is not typical for a patient's gender. |
MA39
Missing/incomplete/invalid gender. |
CO | 7 | View → |
| X399 | Procedure code is not typical for a patient's age. |
N129
Not eligible due to the patient's age. |
CO | 6 | View → |
| X4 | THE PATIENT AGE IS INVALID |
N129
Not eligible due to the patient's age. |
CO | 6 | View → |
| X40 | PROCEDURE CODE IS LIMITED COVERAGE OR IS ASSOCIATED WITH A LIMITED COVERAGE DIAGNOSIS CODE ON THE C… |
N657
This should be billed with the appropriate code for th… |
CO | 11 | View → |
| X400 | Procedure code typically does not require an assistant surgeon. | — | CO | 54 | View → |
| X401 | Procedure code is allowed 1 unit per 6 rolling months for same provider/same diagnosis. |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 222 | View → |
| X402 | T1015 procedure code must be billed as the first procedure code on the claim. |
N182
This claim/service must be billed according to the sch… |
CO | 16 | View → |
| X403 | Claim does not contain the appropriate ER, observation or psychiatric clinic services for Illinois … |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| X404 | Bill type is incompatible with with revenue codes and/or services being billed. |
MA30
Missing/incomplete/invalid type of bill. |
CO | 16 | View → |
| X405 | DOS must be no more than 7 days prior to the date of death. |
N330
Missing/incomplete/invalid patient death date. |
CO | 16 | View → |
| X406 | Home Health services provided outside of Indiana are non-covered services. |
N424
Patient does not reside in the geographic area require… |
CO | 96 | View → |
| X408 | Outpatient services performed three days prior to inpatient admission. | — | CO | 60 | View → |
| X409 | Procedure code is not appropriate for place of service. |
N428
Not covered when performed in this place of service. |
CO | 5 | View → |
| X41 | ICD-10: PROCEDURE CODE IS LIMITED COVERAGE OR IS ASSOCIATED WITH A LIMITED COVERAGE DIAGNOSIS CODE … |
N657
This should be billed with the appropriate code for th… |
CO | 11 | View → |
| X410 | Procedure code is not appropriate for the age of the patient. |
N129
Not eligible due to the patient's age. |
CO | 6 | View → |
| X411 | Procedure code requires manual pricing. |
N10
Adjustment based on the findings of a review organizat… |
CO | 44 | View → |
| X412 | Procedure code requires that an NDC must be billed according to NDC billing guidelines. |
M119
Missing/incomplete/invalid/ deactivated/withdrawn Nati… |
CO | 16 | View → |
| X413 | Taxonomy cannot bill in an outpatient hospital setting. |
N94
Claim/Service denied because a more specific taxonomy … |
CO | 16 | View → |
| X414 | The procedure code billed is an inpatient only code. | — | CO | 5 | View → |
| X415 | EPSDT claim requires one of the following CPT codes to be the first procedure code billed on the cl… |
N182
This claim/service must be billed according to the sch… |
CO | 16 | View → |
| X416 | NDC billed is not in the proper format. The NDC must be in the 5-4-2 configuration. |
M119
Missing/incomplete/invalid/ deactivated/withdrawn Nati… |
CO | 16 | View → |
| X417 | A Multiple procedure reduction applies to procedure code. | — | CO | 59 | View → |
| X418 | Procedure Code is part of a bi-latteral procedure and is paid at 150% of ASC grouping rate. |
N644
Reimbursement has been made according to the bilateral… |
CO | 59 | View → |
| X419 | Modifier indicates supervision of more than one procedure. Line is reimbursed at 30% of the physici… |
N644
Reimbursement has been made according to the bilateral… |
CO | 59 | View → |
| X42 | THE PROCEDURE CODE SHOULD NOT BE REPORTED WHEN THE PATIENTâS LENGTH OF STAY IS LESS THAN FOUR DAY… |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| X420 | Modifier indicates medical direction of service performed by CRNA. Line is reimbursed at 60% of the… | — | CO | 203 | View → |
| X421 | Modifier indicates a surgical assistant. Line is reimbursed at 20% of the physician fee schedule. | — | CO | 203 | View → |
| X422 | Modifier indicates a co-surgeon. Line is reimbursed at 62.5% of the physician fee schedule. | — | CO | 203 | View → |
| X423 | Taxonomy reimburses at a variable percentage of physician fee schedule. | — | CO | 203 | View → |
| X424 | Place of Service reimbursed at a reduced rate. Line is reimbursed at 80% of the physician fee sched… |
N381
Alert: Consult our contractual agreement for restricti… |
CO | 144 | View → |
| X425 | Service is packaged into another billed procedure. |
M15
Separately billed services/tests have been bundled as … |
CO | 234 | View → |
| X426 | Modifier not applicable for procedure code. Line item not reimbursed. |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| X427 | Bilateral procedure code with modifier 50 cannot exceed 1 unit. |
N644
Reimbursement has been made according to the bilateral… |
CO | 59 | View → |
| X428 | Code is not separately reimbursable. |
M15
Separately billed services/tests have been bundled as … |
CO | 97 | View → |
| X429 | First 30 minutes of waiting time is not reimbursed. |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| X43 | ASSIGN DRG ONLY IF MISSING ON INSTITUTIONAL INPATIENT CLAIM | — | CO | 16 | View → |
| X430 | Hospice rate reduction for services exceeding 60 days. |
N640
Exceeds number/frequency approved/allowed within time … |
CO | 119 | View → |
| X431 | IHCP allows a maximum of one unit per service, per revenue code, per date of service. |
N640
Exceeds number/frequency approved/allowed within time … |
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.