Remark Codes — Complete List & Lookup

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.

2,992

Total Remark Codes

Adjustment Groups

835

RA835 Mapped

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Looking for Denial Codes (CARC)?

Browse Claim Adjustment Reason Codes — the codes that explain why a payment was reduced or denied.

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Showing 2,201–2,250 of 2,992 remark codes

Remark Code	Description	RA835 Code	Group	Reason Code
Y578	HAIR ANALYSIS IS A NON-COVERED SERVICE.	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y579	BACTERIAL URINE CULTURE IS NOT COVERED BY MEDICARE	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y580	HUMAN IMUNODEFICIENCY VIRUS (HIV) TESTING IS NOT COVERED BY MEDICARE	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y581	HUMAN IMMUNODEFICIENCY VIRUS (HIV) TESTING (PROGNOSIS INCLUDING MONITORING) IS NOT COVERED BY MEDIC…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y582	BLOOD COUNTS TESTING IS NOT COVERED BY MEDICARE WHEN BILLED WITH UNSUPPORTED DIAGNOSIS	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y583	PARTIAL THROMBOPLASTIN TIME (PTT) IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT SUPPORTING DIAGNOS…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y584	PROTHROMBIN TIME (PT) IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT SUPPORTING DIAGNOSIS	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y585	PROCEDURE HAS A MAXIMUM FREQUENCY OF SERVICES	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y586	PROTHROMBIN TIME (PT) HAS A MAXIMUM FREQUENCY OF SERVICE UNITS PER FREQUENCY VALUE QUALIFIER	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y587	SERUM IRON STUDIES ARE NOT COVERED BY MEDICARE WITHOUT AN APPROPRIATE DIAGNOSIS	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y588	SERUM IRON STUDIES ARE NOT COVERED BY MEDICARE WHEN BILLED MORE THAN ONCE IN A 90 DAY INTERVAL.	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y589	COLLAGEN CROSSLINKS ARE NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE SUPPORTING DIAGN…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y590	GLYCATED HEMOGLOBIN/GLYCATED PROTEIN ARE NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y591	THYROID TESTING IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE SUPPORTING DIAGNOSIS	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y592	DIGOXIN THERAPEUTIC DRUG ASSAY IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE SUPPOR…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y593	ALPHA-FETOPROTEIN IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE SUPPORTING DIAGNOSIS	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y594	CARCINOEMBRYONIC ANTIGEN IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE SUPPORTING D…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y595	TUMOR ANTIGEN BY IMMUNOASSAY CA 125 IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE S…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y596	TUMOR ANTIGEN BY IMMUNOASSAY CA 19-9 IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE …	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y597	PROSTATE SPECIFIC ANTIGEN IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE SUPPORTING …	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y598	PROSTATE SPECIFIC ANTIGEN IS NOT COVERED BY MEDICARE WHEN BILLED MORE THAN ONCE IN A 12 MONTH PERIOD	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y599	GAMMA GLUTAMYL TRANSFERASE IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE SUPPORTING…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y6	ADMISSION DIAGNOSIS DESCRIBES AN EXTERNAL CAUSE OR REQUIRES THE ICD CODE FOR THE FIRST UNDERLYING D…	MA63 Missing/incomplete/invalid principal diagnosis.	CO	16	View →
Y600	HEPATITIS PANEL/ACUTE HEPATITIS PANEL IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE…	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y601	ALUMINUM LAB TEST IS NOT COVERED BY MEDICARE WHEN BILLED MORE THAN ONCE WITHIN A 3 MONTH PERIOD	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y602	HEARTSBREATH TEST IS NOT REASONABLE AND NECESSARY AND IS NOT COVERED BY CMS	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y603	BRACHYTHERAPY SOURCES PROCEDURE REQUIRES A VALID BRACHYTHERAPY PROCEDURE.	M84 Medical code sets used must be the codes in effect at …	CO	16	View →
Y604	DIRECT ADMISSION OF PATIENT FOR HOSPITAL OBSERVATION CARE WHEN BILLED WITH CRITICAL CARE, EVALUATIO…	N55 Procedures for billing with group/referring/performing…	CO	16	View →
Y605	DMEPOS ITEMS BILLED BY A DMEMAC PROVIDER WITH INVALID POS WILL BE DENIED.	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	5	View →
Y606	MANUAL WHEELCHAIR OR WHEELCHAIR-SPECIAL SIZE MUST BE BILLED WITH MODIFIER KX	N572 This procedure is not payable unless appropriate non-p…	CO	16	View →
Y607	GLYCATED HEMOGLOBIN/GLYCATED PROTEIN PROCEDURE IS NOT COVERED BY MEDICARE WHEN BILLED MORE THAN ONC…	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y608	CARCINOEMBRYONIC ANTIGEN IS NOT COVERED BY MEDICARE WHEN BILLED MORE THAN TWICE WITHIN A PATIENT'S …	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y609	A4606 (RE-USABLE PULSE OXIMETER) WITH MODIFIER U5 - 1 UNIT EVERY SIX CALENDAR MONTHS	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y610	A4606 (RE-USABLE PULSE OXIMETER) WITH NO MODIFIER - 4 PER MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y611	A4623 (TRACHEOSTOMY, DISPOSABLE INNER CANNULA) WITH MODIFIER U3 - 31 PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y612	A4623 (TRACHEOSTOMY, DISPOSABLE INNER CANNULA) WITH NO MODIFIER - 1 PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y613	A7520 â 1 UNIT PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y614	A7520 WITH MODIFIER U1 - 1 PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y615	A7520 WITH MODIFIER U2 - 1 PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y616	A7521 - 1 PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y617	A7521 WITH MODIFIER U1 - 1 PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y618	A7521 WITH MODIFIER U2 - 1 PER CALENDAR MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y619	E0445 (OXIMETER DEVICE) WITH MODIFIER U4 - 1 PER FIVE ROLLING YEARS	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y620	E0445 WITH NO MODIFIER - 1 EVERY 6 MONTHS	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
Y621	IT IS INAPPROPRIATE TO PROVIDE HEPATITIS A/B VACCINES, INFLUENZA VACCINES OR PNEUMOCOCCAL PNEUMONIA…	N428 Not covered when performed in this place of service.	CO	5	View →
Y622	A COMBINATION OF MODIFIERS GN, GO, OR GP CANNOT BE REPORTED ON THE SAME SERVICE LINE ON INSTITUTION…	N519 Invalid combination of HCPCS modifiers.	CO	16	View →
Y623	THERAPY SERVICES MUST BE BILLED WITH A MODIFIER APPROPRIATE TO THE REVENUE CODE.	N572 This procedure is not payable unless appropriate non-p…	CO	16	View →
Y624	ACCORDING TO CMS POLICY, PROCEDURES THAT ARE REDUCED SERVICES (MODIFIER 52) OR DISCONTINUED PRIOR T…	M53 Missing/incomplete/invalid days or units of service.	CO	222	View →
Y625	MODIFIER Q0 OR MODIFIER Q1 CAN ONLY BE BILLED WHEN CONDITION CODE 30 AND BILL TYPE 0130-013Z (HOSPI…	N519 Invalid combination of HCPCS modifiers.	CO	16	View →
Y626	BRACHYTHERAPY SOURCE BILLED WITHOUT AN APPROVED ASC SURGICAL PROCEDURE.	M84 Medical code sets used must be the codes in effect at …	CO	16	View →

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What is a Remark Code?

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.

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Remark Code vs. Denial Code

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.

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How to Use This List

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.