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 2,101–2,150 of 2,818 remark codes in group CO

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Remark Code	Description	RA835 Code	Group	Reason Code
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 →
Y627	CONDITION CODE 44 (INPATIENT ADMISSION CHANGED TO OUTPATIENT) CAN ONLY BE BILLED WITH BILL TYPES 01…	MA30 Missing/incomplete/invalid type of bill.	CO	5	View →
Y628	PER THE MEDICARE PHYSICIAN FEE SCHEDULE, PROCEDURE CODE DESCRIBES A PHYSICAL THERAPY SERVICES SUBMI…	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	5	View →
Y629	MODIFIER ON PROC CODE INDICATES A REDUCTION.	N546 Payment represents a previous reduction based on the E…	CO	45	View →
Y630	PER CMS POLICY, PROCEDURE CODE DESCRIBES HYPERTHERMIA SERVICES WHICH ARE ONLY COVERED WHEN BILLED I…	M84 Medical code sets used must be the codes in effect at …	CO	16	View →
Y631	(HOSPITAL DISCHARGE SERVICES) WAS BILLED ON PRIOR DAY ON CLAIM.	N522 Duplicate of a claim processed, or to be processed, as…	CO	18	View →
Y632	CO-SURGEONS COULD BE PAID, THOUGH SUPPORTING DOCUMENTATION IS REQUIRED TO ESTABLISH THE MEDICAL NEC…	N706 Missing documentation.	CO	163	View →
Y633	PER THE MEDICARE PHYSICIAN FEE SCHEDULE, PROCEDURE CODE DESCRIBES A PHYSICIAN INTERPRETATION FOR SE…	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	5	View →
Y634	PER CMS GUIDELINES, CO-SURGEON CLAIMS WHEN BOTH SURGEONS HAVE THE SAME SUBSPECIALTY FOR PROCEDURES …	N130 Consult plan benefit documents/guidelines for informat…	CO	204	View →
Y635	PER AMA GUIDELINES, INITIAL HOSPITAL OR BIRTHING CENTER CARE WILL BE DENIED WHEN THE NEWBORN HAS RE…	M84 Medical code sets used must be the codes in effect at …	CO	16	View →
Y636	ROOM & BOARD REVENUE CODES IN AN OUTPATIENT HOSPITAL SETTING	N676 Service does not qualify for payment under the Outpati…	CO	60	View →
Y637	DROP VCE.49953 (040CCO - MODIFIER 59)	N519 Invalid combination of HCPCS modifiers.	CO	16	View →
Y638	DROP VCE.49953 (040CCO COPY - MODIFIER TC)	N519 Invalid combination of HCPCS modifiers.	CO	16	View →
Y639	DROP VCE.21210 (PATIENT AGE GREATER THAN 70)	N129 Not eligible due to the patient's age.	CO	272	View →
Y640	DROP VCE.20603 (NPT - EXCLUDE PREVENTATIVE CODES)	N130 Consult plan benefit documents/guidelines for informat…	CO	272	View →
Y641	DROP VCE.21205 (SUB 90680 - ADMIN CODES)	N130 Consult plan benefit documents/guidelines for informat…	CO	272	View →
Y642	INSTITUTIONAL CLAIM IS A POSSIBLE DUPLICATE OF CLAIM .	N522 Duplicate of a claim processed, or to be processed, as…	CO	18	View →
Y643	PROCEDURE CODE IS A POSSIBLE DUPLICATE OF CLAIM LINE. PROCEDURE SHOULD BE BILLED IN THE SAME SERVIC…	N522 Duplicate of a claim processed, or to be processed, as…	CO	18	View →
Y644	PROCEDURE LINE IS A POSSIBLE DUPLICATE OF CLAIM. PROCEDURE CAN NOT BE BILLED ON SAME DOS WITH DIFFE…	N522 Duplicate of a claim processed, or to be processed, as…	CO	18	View →
Y645	INJECTIONS, LABS REPORTS, AND TESTS MUST BE BILLED WITH SPECIFIC PROCEDURE CODE ON ONE SERVICE SECT…	N381 Alert: Consult our contractual agreement for restricti…	CO	16	View →
Y646	THERAPY MUST BE BILLED WITH ONE SERVICE SECTION FOR EACH ITEM (PT, OT OR ST) OR SERVICE PROVIDED TO…	N381 Alert: Consult our contractual agreement for restricti…	CO	272	View →
Y647	MODIFIER 25/59 CAN NOT BE BILLED MULTIPLE TIMES FOR THE SAME SERVICE RENDERED ON THE SAME DOS.	N130 Consult plan benefit documents/guidelines for informat…	CO	272	View →
Y648	PRICING MODIFIERS SHOULD NOT BE SUBMITTED MULTIPLE TIMES ON THE SAME PROCEDURE.	N130 Consult plan benefit documents/guidelines for informat…	CO	272	View →
Y649	IMPROPER BILLING OF BILATERAL PROCEDURE. UNITS MUST BE 1.	M53 Missing/incomplete/invalid days or units of service.	CO	222	View →
Y650	AUDIOLOGY INPATIENT CHARGES ARE INCLUDED IN THE REIMBURSEMENT TO A HOSPITAL AND ARE NOT TO BE BILLE…	N130 Consult plan benefit documents/guidelines for informat…	CO	272	View →
Y651	PROVIDER TAXONOMY CANNOT BILL IN PLACE OF SERVICE .	N288 Missing/incomplete/invalid rendering provider taxonomy.	CO	8	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.