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 1,451–1,500 of 2,818 remark codes in group CO

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Remark Code	Description	RA835 Code	Group	Reason Code
X819	PHOTOPHERESIS, EXTRACORPOREAL BILLED WITHOUT A DIAGNOSIS FOR THE UNDERLYING CAUSE WILL BE DENIED.	M64 Missing/incomplete/invalid other diagnosis.	CO	16	View →
X82	INCONSISTENCY BETWEEN IMPLANTED DEVICE OR ADMINISTERED SUBSTANCE AND IMPLANTATION OR ASSOCIATED PRO…	M51 Missing/incomplete/invalid procedure code(s).	CO	236	View →
X820	PHOTOPHERESIS, EXTRACORPOREAL BILLED WITH GRAFT-VERSUS-HOST-DISEASE WITHOUT A DIAGNOSIS OF COMPLICA…	M64 Missing/incomplete/invalid other diagnosis.	CO	16	View →
X821	TAPE (A4450, A4452) IS DENIED WHEN BILLED WITHOUT MODIFIERS AU, AV, AW, AX.	N657 This should be billed with the appropriate code for th…	CO	4	View →
X822	OSTEOGENESIS STIMULATORS DESCRIBED BY HCPCS CODES E0747, E0748, AND E0760 ARE CLASSIFIED AS CLASS I…	N657 This should be billed with the appropriate code for th…	CO	4	View →
X823	DIAGNOSTIC SERVICES OR OP NON-REHABILITATION SERVICES BILLED WITH THERAPY SERVICES MODIFIERS WILL B…	N657 This should be billed with the appropriate code for th…	CO	4	View →
X824	SERVICE INAPPROPRIATELY BILLED WITH TELEHEALTH SERVICE MODIFIER.	N657 This should be billed with the appropriate code for th…	CO	4	View →
X825	CPT CARE PLAN OVERSIGHT SERVICES WHEN BILLED WITHIN THE SAME CALENDAR MONTH OF A MONTHLY ESRD SERVI…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X826	CPT (INJECTION, LEVOCARNITINE) MUST BE BILLED WITH APPROPRIATE DIAGNOSIS.	M64 Missing/incomplete/invalid other diagnosis.	CO	16	View →
X827	PHYSICIAN RECERTIFICATION FOR HOME HEALTH SERVICES (G0179) IS DENIED IF BILLED MORE THAN ONCE EVERY…	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X828	T1001 (NURSING ASSESSMENT EVALUATION) CANNOT BE BILLED MORE THAN ONCE A MONTH.	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X829	EXCISION/DESTRUCTION/CRYOTHERAPY OF BENIGN OR PREMALIGNANT SKIN LESIONS BILLED WITH INAPPROPRIATE P…	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	16	View →
X83	MUTUALLY EXCLUSIVE PROCEDURE THAT WOULD BE ALLOWED BY NCCI IF APPROPRIATE MODIFIER WERE PRESENT	N519 Invalid combination of HCPCS modifiers.	CO	4	View →
X830	EXCISION/DESTRUCTION/CRYOTHERAPY OF BENIGN OR PREMALIGNANT SKIN LESIONS BILLED WITH INAPPROPRIATE P…	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	16	View →
X831	MAX OF ONE FECAL OCCULT BLOOD TEST CPT IS ALLOWED PER YEAR.	M90 Not covered more than once in a 12 month period.	CO	151	View →
X832	MAX OF ONE SIGMOIDOSCOPY OR BARIUM ENEMA CPT IS ALLOWED EVERY FOUR YEARS.	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X833	BARIUM ENEMA HIGH RISK ALTERNATIVE TO SCREENING COLONOSCOPY CPT IS NOT COVERED WHEN BILLED WITHOUT …	M64 Missing/incomplete/invalid other diagnosis.	CO	16	View →
X834	WHEN THE DIAGNOSIS IS NOT MULTIPLE GESTATION, THE MAXIMUM UNIT ALLOWED FOR PROCEDURE IS 1 PER DAY.	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X835	WHEN THE DIAGNOSIS IS MULTIPLE GESTATION, ULTRASOUNDS HAVE MAXIMUM UNITS PER DAY RESTRICTIONS.	M53 Missing/incomplete/invalid days or units of service.	CO	222	View →
X836	CPT ADVANCED KNEES, ANKLES AND FEET WITHOUT AN APPROPRIATE K3 OR K4 FUNCTIONAL MODIFIER WILL BE DEN…	N572 This procedure is not payable unless appropriate non-p…	CO	4	View →
X837	MORE SPECIFIC CODING AVAILABLE	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X838	PRIVATE DUTY NURSING WILL NOT EXCEED 96 UNITS PER 24 HOUR	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X839	PRIVATE DUTY NURSING WILL NOT EXCEED 8000 UNITS PER CALENDAR YEAR	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X84	CODE2 OF A CODE PAIR THAT WOULD BE ALLOWED BY NCCI IF APPROPRIATE MODIFIER WERE PRESENT	M86 Service denied because payment already made for same/s…	CO	97	View →
X840	DENTAL CODES HAVE A COVERAGE LIMIT OF ONCE PER YEAR	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X841	DENTAL SEALANT PER TOOTH - MAXIMUM UNITS PAYABLE = 8	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X843	MOD 79 INDICATES A 2ND PROCEDURE BY SAME PHYS IS UNRELATED TO A PRIOR PROCEDURE, BUT NO PRIOR PROCE…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X844	PROC BILLED WITH MOD 54, 55 OR 56 IS DENIED BECAUSE IT WAS BILLED PREVIOUSLY, WITHOUT A MODIFIER, O…	N657 This should be billed with the appropriate code for th…	CO	4	View →
X845	MOD 76 INDICATES REPEAT PROCEDURE BY SAME PHYS, BUT NO PRIOR INSTANCE OF THIS PROCEDURE WAS FOUND (…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X846	MOD 77 INDICATES A REPEAT PROCEDURE BY A DIFFERENT PHYS, BUT NO PRIOR INSTANCE OF THIS PROCEDURE WA…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X847	MOD 77 INDICATES A REPEAT PROCEDURE BY A DIFFERENT PHYS. PROCEDURE {0} IS DENIED BECAUSE IT WAS BIL…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X848	PROCS WITHOUT MOD 54, 55 OR 56 ARE DENIED WHEN SAME PROC WAS PREVIOUSLY BILLED BY ANOTHER PHYS WITH…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X849	MODIFIER 51 SUBMITTED WITH AN ADD-ON PROCEDURE CODE WILL BE DENIED.	M20 Missing/incomplete/invalid HCPCS.	CO	4	View →
X85	INVALID REVENUE CODE	M50 Missing/incomplete/invalid revenue code(s).	CO	16	View →
X850	CPT ADVANCED KNEES, ANKLES AND FEET WITHOUT AN APPROPRIATE K2, K3 OR K4 FUNCTIONAL MODIFIER WILL BE…	N657 This should be billed with the appropriate code for th…	CO	4	View →
X851	CPT SPINAL ORTHOSIS PROCEDURES MUST BE BILLED WITH CG MODIFIER	N657 This should be billed with the appropriate code for th…	CO	4	View →
X852	PROCEDURES WITH MODIFIER 55 OR 56, IN ADDITION TO MODIFIER 78, ARE DENIED.	N657 This should be billed with the appropriate code for th…	CO	4	View →
X853	DEVICE IS INTEGRAL TO A COVERED ASC SURGICAL PROCEDURE, BUT NO CORRESPONDING ASC SURGICAL PROCEDURE…	M51 Missing/incomplete/invalid procedure code(s).	CO	16	View →
X854	EVALUATION AND MANAGEMENT SERVICES ARE NOT SEPARATELY PAYABLE WHEN BILLED WITH 93701 (BIOIMPEDANCE,…	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	16	View →
X855	E&M CODE IS NOT COVERED BY CMS WHEN BILLED IN A PLACE OF SERVICE ON CLAIM.	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	16	View →
X856	HOME HEALTH/HOME INFUSION PROCEDURE REQUIRES A VALID MODIFIER SS AND A VALID PLACE OF SERVICE.	N130 Consult plan benefit documents/guidelines for informat…	CO	16	View →
X857	G0446 (ANNUAL, FACE-TO-FACE IBT FOR CVD) IS DENIED WHEN POS IS NOT 11, 22, 49, 50, 71, 72	M77 Missing/incomplete/invalid/inappropriate place of serv…	CO	16	View →
X858	SURGICAL AND MEDICAL SERVICE IS DENIED BECAUSE IT WAS BILLED WITHIN DAY GLOBAL POST OPERATIVE PERIO…	N525 These services are not covered when performed within t…	CO	96	View →
X859	ONLY ONE TECHNICAL COMPONENT FOR THE SAME SERVICE MAY BE BILLED. A SIMILAR SERVICE WAS BILLED ON CL…	N522 Duplicate of a claim processed, or to be processed, as…	CO	18	View →
X86	MULTIPLE MEDICAL VISITS ON SAME DAY WITH SAME REVENUE CODE WITHOUT CONDITION CODE G0	N657 This should be billed with the appropriate code for th…	CO	236	View →
X860	CPT 93701 (BIOIMPEDANCE, THORACIC, ELECTRICAL) IS DENIED WHEN BILLED ON THE SAME DATE OF SERVICE AS…	M64 Missing/incomplete/invalid other diagnosis.	CO	16	View →
X861	CPT 93701 (BIOIMPEDANCE, THORACIC, ELECTRICAL) IS DENIED WHEN THE ONLY DIAGNOSIS ON THE CLAIM IS AO…	M64 Missing/incomplete/invalid other diagnosis.	CO	16	View →
X862	CORRECT NDC CODE REQUIRED.	M119 Missing/incomplete/invalid/ deactivated/withdrawn Nati…	CO	4	View →
X863	HCPCS CODE IS NOT ON THE ASP DRUG SCHEDULE AND NDC IS NOT ON NOC SO THE CHARGE IS NOT COVERED.	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X864	INAPPROPRIATE CODING FOR CONTRACT AGREEMENT: HCPCS CATEGORY II CODE IS REQUIRED	N657 This should be billed with the appropriate code for th…	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.