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 | |
|---|---|---|---|---|---|
| Y17 | A MANIFESTATION CODE CAN NOT BE USED AS THE PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y174 | SAME CLAIM - THE E/M CODE WAS BILLED ON THE SAME DATE OF SERVICE OR ONE DAY PRIOR TO A DIFFERENT PR… |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| Y18 | THE PRINCIPAL DIAGNOSIS IS NOT NORMALLY SUFFICIENT JUSTIFICATION FOR ADMISSION TO A HOSPITAL. |
N569
Not covered when performed for the reported diagnosis. |
CO | 96 | View → |
| Y19 | THE DIAGNOSIS CODE IS NOT ACCEPTABLE AS A PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y193 | THE MODIFIER IS DISABLED/NOT VALID |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| Y2 | PRINCIPAL DIAGNOSIS: THE PRINCIPAL DIAGNOSIS IS INVALID OR DISABLED. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y20 | THE DIAGNOSIS CODE IS NOT ACCEPTABLE AS A PRINCIPAL DIAGNOSIS UNLESS A SECONDARY DIAGNOSIS IS PRESE… |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| Y208 | PER MEDICARE GUIDELINES, THE HCPCS CODE IS IDENTIFIED AS AN AMBULANCE CODE AND REQUIRES AN AMBULANC… |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| Y209 | THE DIAGNOSTIC PROCEDURE CODE BILLED BY A PHYSICIAN REQUIRES A 26 MODIFIER WHEN PERFORMED IN A FACI… |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| Y21 | HAC STATUS: ONE OR MORE HAC CRITERIA MET, FINAL DRG CHANGES |
N647
Adjusted based on diagnosis-related group (DRG). |
CO | 96 | View → |
| Y210 | THE PAYMENT MODIFIER IS REQUIRED TO BE IN THE FIRST POSITION WHEN BILLED UNLESS ANOTHER PAYMENT MOD… |
M81
You are required to code to the highest level of speci… |
CO | 16 | View → |
| Y22 | THE PRINCIPAL DIAGNOSIS CODE INDICATES THAT A WRONG PATIENT PROCEDURE WAS PERFORMED |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 11 | View → |
| Y23 | THE OTHER DIAGNOSIS CODE INDICATES THAT A WRONG PATIENT PROCEDURE WAS PERFORMED |
N657
This should be billed with the appropriate code for th… |
CO | 11 | View → |
| Y24 | THE ADMISSION DIAGNOSIS IS A NONSPECIFIC DIAGNOSIS CODE AND REQUIRES A FOURTH AND/OR FIFTH DIGIT. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| Y25 | THE PRINCIPAL DIAGNOSIS IS A NONSPECIFIC DIAGNOSIS CODE AND REQUIRES A FOURTH AND/OR FIFTH DIGIT. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y26 | THE OTHER DIAGNOSIS IS A NONSPECIFIC DIAGNOSIS CODE AND REQUIRES A FOURTH AND/OR FIFTH DIGIT. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| Y27 | THERE IS NO ADMISSION DIAGNOSIS LISTED FOR THIS PROCEDURE. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| Y28 | THERE IS NO PRINCIPAL DIAGNOSIS LISTED FOR THIS PROCEDURE. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y29 | THE PRINCIPAL DIAGNOSIS CODE IS NON-EXEMPT AND REQUIRES A VALID POA INDICATOR. |
N434
Missing/Incomplete/Invalid Present on Admission indica… |
CO | 16 | View → |
| Y296 | Co-Surgeon modifier 62 indicates a 50% reduction of the state maximum shoud be applied. | — | CO | 45 | View → |
| Y297 | Co-Surgeon modifier 62 not applicable for procedure code. Line item not reimbursed. |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| Y299 | Assistant Surgeon modifier not applicable for procedure code. Line item not reimbursed. |
N657
This should be billed with the appropriate code for th… |
CO | 4 | View → |
| Y3 | OTHER DIAGNOSIS: THE OTHER DIAGNOSIS IS INVALID OR DISABLED. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| Y30 | THE OTHER DIAGNOSIS CODE IS NON-EXEMPT AND REQUIRES A VALID POA INDICATOR. |
N434
Missing/Incomplete/Invalid Present on Admission indica… |
CO | 16 | View → |
| Y300 | Lab Panel reduction applied to line item. | — | CO | 45 | View → |
| Y301 | Code is part of Panel billed on same day. Line item not reimbursed. |
M15
Separately billed services/tests have been bundled as … |
CO | 97 | View → |
| Y302 | The Procedure code is reimbursed under an alternate therapy procedure code for therapists. The Proc… |
N130
Consult plan benefit documents/guidelines for informat… |
CO | 96 | View → |
| Y303 | Modifier 26 billed for a code that does not have a professional component per the fee schedule. |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| Y305 | UNITS EXCEEDS STATE MAXIMUM ALLOWED. |
N362
The number of Days or Units of Service exceeds our acc… |
CO | 96 | View → |
| Y306 | Dasa Services billed with unacceptable primary diagnosis. Acceptable primary diagnosis codes: F10-F… |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y307 | HOSPICE (K17): Hospice Services provided for 61 or more days. Rates for Routine Home Care will be … | — | CO | 203 | View → |
| Y308 | HOSPICE (K16): Service Intensity Add-on Billing Invalid: 1. 055X or 056X is billed but the Pati… |
MA43
Missing/incomplete/invalid patient status. |
CO | 16 | View → |
| Y309 | HOSPICE: REVENUE CODE(S) REQUIRES THAT VALUE CODE SPECIFYING THE CORE BASED STATISTIC AREA (CBSA). |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
CO | 16 | View → |
| Y31 | THE PRINCIPAL PROCEDURE CODE IS INVALID OR DISABLED. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y310 | Dasa Services require a Value Code of 80 specifying the number of covered treatment days. |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
CO | 16 | View → |
| Y311 | PROCEDURE CODE REQUIRES THAT AN NDC MUST BE BILLED ACCORDING TO NDC BILLING GUIDELINES. |
M49
Missing/incomplete/invalid value code(s) or amount(s). |
CO | 16 | View → |
| Y312 | EAPG- EXTERNAL CAUSE OF MORBIDITY CODE CANNOT BE USED AS PRIMARY OR PRINCIPAL DIAGNOSIS. |
MA63
Missing/incomplete/invalid principal diagnosis. |
CO | 16 | View → |
| Y313 | EAPG- INVALID PROCEDURE CODE. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| Y314 | EAPG- Invalid procedure code. |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| Y315 | EAPG - NCCI MEDICARE FAC - PROCEDURE CODE PAIR CONFLICT. COMBINATION IS NOT ALLOWED EVEN IF APPROP… |
M51
Missing/incomplete/invalid procedure code(s). |
CO | 16 | View → |
| Y316 | EAPG- MEDICAL VISITS REPORTED WITHOUT MODIFIER -25 OR -27 ON THE SAME DAY AS A SIGNIFICANT PROCEDUR… |
N519
Invalid combination of HCPCS modifiers. |
CO | 16 | View → |
| Y317 | EAPG- MODIFIER IS INVALID. |
N519
Invalid combination of HCPCS modifiers. |
CO | 4 | View → |
| Y318 | EAPG- From date is out of date range for grouper. |
N301
Missing/incomplete/invalid procedure date(s). |
CO | 16 | View → |
| Y319 | EAPG- Invalid age. |
N329
Missing/incomplete/invalid patient birth date. |
CO | 16 | View → |
| Y32 | THE OTHER DIAGNOSIS CODE IS INVALID OR DISABLED. |
M64
Missing/incomplete/invalid other diagnosis. |
CO | 16 | View → |
| Y320 | EAPG- Invalid sex. |
MA39
Missing/incomplete/invalid gender. |
CO | 16 | View → |
| Y321 | EAPG- REVENUE CODE IS INVALID. |
M50
Missing/incomplete/invalid revenue code(s). |
CO | 16 | View → |
| Y323 | EAPG- Units of service greater than one is inappropriate for bilateral procedure reported with modi… |
M53
Missing/incomplete/invalid days or units of service. |
CO | 16 | View → |
| Y324 | EAPG- Invalid diagnosis code, 4th or 5th digit required. |
MA65
Missing/incomplete/invalid admitting diagnosis. |
CO | 16 | View → |
| Y325 | EAPG- Invalid diagnosis code. |
M64
Missing/incomplete/invalid other 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.