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 1,401–1,450 of 2,992 remark codes

Remark Code	Description	RA835 Code	Group	Reason Code
X660	DENY ROOM AND BOARD REVENUE CODES WHEN BILLED IN AN OUTPATIENT HOSPITAL SETTING.	N676 Service does not qualify for payment under the Outpati…	CO	60	View →
X661	MEDICAL/SURGICAL SUPPLIES AND DME CANNOT BE BILLED WITH PROFESSIONAL FEE REVENUE CODES (0960-0989) …	N130 Consult plan benefit documents/guidelines for informat…	CO	272	View →
X662	FACILITY SHOULD NOT BILL OP CLAIM.	N676 Service does not qualify for payment under the Outpati…	CO	60	View →
X663	FACILITY SHOULD NOT BILL IP CLAIM.	N130 Consult plan benefit documents/guidelines for informat…	CO	272	View →
X664	PROSTHESIS BILLED WITH MODIFIER K0 OR KO WILL BE DENIED.	N657 This should be billed with the appropriate code for th…	CO	4	View →
X665	DME IS NOT ON THE CAPPED RENTAL LIST AND CANNOT BE BILLED WITH A RENTAL MODIFIER	N519 Invalid combination of HCPCS modifiers.	CO	16	View →
X666	PROSTHESIS AND ORTHOSIS MUST BE BILLED WITH MODIFIERS LT OR RT	N519 Invalid combination of HCPCS modifiers.	CO	16	View →
X667	CAPPED DME RENTAL IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE MODIFIER(RR,KI,KH O…	N519 Invalid combination of HCPCS modifiers.	CO	16	View →
X668	DME SERVICE IS NOT COVERED BY CMS AS A RENTAL OR A PURCHASE WHEN THE ITEM HAS PREVIOUSLY BEEN PAID …	N522 Duplicate of a claim processed, or to be processed, as…	CO	18	View →
X669	WHEEL CHAIR OR ACCESSORY IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE MODIFIER (KX)	N657 This should be billed with the appropriate code for th…	CO	4	View →
X67	INVALID DATE	N301 Missing/incomplete/invalid procedure date(s).	CO	16	View →
X670	CUSHIONS AND POSITIONING ACCESSORIES IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE …	N657 This should be billed with the appropriate code for th…	CO	4	View →
X671	HOSPITAL BED OR ACCESSORY IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE MODIFIER (K…	N657 This should be billed with the appropriate code for th…	CO	4	View →
X672	TOTAL ELECTRIC HOSPITAL BED IS NOT COVERED BY MEDICARE	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X673	WHEEL CHAIR OR ACCESSORY IS NOT COVERED BY MEDICARE WHEN BILLED WITHOUT AN APPROPRIATE MODIFIER (KX)	N657 This should be billed with the appropriate code for th…	CO	4	View →
X674	OXYGEN OR OXYGEN EQUIPMENT IS NOT COVERED WHEN BILLED MORE THAN ONCE PER MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X675	OXYGEN RENTAL EQUIPMENT CPT IS NOT COVERED BY CMS WHEN BILLED WITHOUT RENTAL MODIFIER RR	N657 This should be billed with the appropriate code for th…	CO	4	View →
X676	LARGE VOLUME ULTRASONIC NEBULIZER/ACCESSORIES ARE NOT COVERED BY CMS	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X677	RESPIRATORY ASSIST DEVICE IS NOT COVERED WHEN BILLED WITHOUT MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X678	EXTERNAL INFUSION PUMP/ADMINISTRATION IS NOT COVERED WHEN BILLED WITHOUT MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X679	EXTERNAL INFUSION PUMPS ARE NOT COVERED WHEN BILLED WITHOUT MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X68	DATE OUT OF OCE RANGE	M53 Missing/incomplete/invalid days or units of service.	CO	16	View →
X680	COMMODE MUST BE BILLED WITH MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X681	SPEECH GENERATING DEVICE MUST BE BILLED WITH MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X682	HIGH FREQUENCY CHEST WALL OSCILLATION DEVICE MUST BE BILLED WITH MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X683	AUTOMATIC EXTERNAL DEFIBRILLATOR IS NOT COVERED WHEN BILLED WITHOUT MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X684	MISCELLANEOUS DME SUPPLY/ACCESSORY IS NOT COVERED WHEN BILLED WITH WEARABLE, AUTOMATIC EXTERNAL DEF…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X685	HOME GLUCOSE MONITORING SUPPLIES MUST BE BILLED WITH AN APPROPRIATE MODIFIER.	N657 This should be billed with the appropriate code for th…	CO	4	View →
X686	SUCTION VALVE BILLED WITH A LOCKING MECHANISM IS NOT COVERED.	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X687	GASTROSTOMY/JEJUNOSTOMY TUBE IS NOT COVERED BY CMS WHEN BILLED MORE THAN ONCE IN A 90 DAY PERIOD.	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X688	ENTERAL FEEDING KITS IS NOT COVERED BY CMS WHEN BILLED MORE THAN ONCE PER MONTH.	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X689	ANKLE-FOOT ORTHOSIS/KNEE-ANKLE-FOOT ORTHOSIS MUST BE BILLED WITH MODIFIER KX.	N657 This should be billed with the appropriate code for th…	CO	4	View →
X69	PATIENT AGE INVALID	N329 Missing/incomplete/invalid patient birth date.	CO	6	View →
X690	ORTHOPEDIC FOOTWEAR IS NOT COVERED BY CMS.	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X691	ORTHOPEDIC SHOES ARE NOT COVERED BY CMS WHEN BILLED WITHOUT A KX MODIFIER	N657 This should be billed with the appropriate code for th…	CO	4	View →
X692	THERAPEUTIC SHOES/INSERTS/MODIFICATIONS FOR DIABETICS ONLY IS NOT COVERED BY CMS WHEN BILLED WITHOU…	M64 Missing/incomplete/invalid other diagnosis.	CO	16	View →
X693	THERAPEUTIC INSERT FOR DIABETICS ONLY IS NOT COVERED BY CMS WHEN BILLED WITH L5000 ON THE SAME CLAI…	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X694	NEGATIVE WOUND THERAPY PRESSURE PUMP MUST BE BILLED WITH MODIFIER KX.	N657 This should be billed with the appropriate code for th…	CO	4	View →
X695	NON-DME CODE BILLED BY A DME PROVIDER WILL BE DENIED.	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X696	PROCEDURE BILLED IN INPATIENT OR FACILITY PLACES OF SERVICE WILL BE DENIED.	N130 Consult plan benefit documents/guidelines for informat…	CO	96	View →
X697	CAPPED DME RENTAL IS NOT COVERED BY MEDICARE WHEN BILLED MORE THAN ONCE PER MONTH	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X698	CAPPED DME RENTAL IS NOT COVERED BY MEDICARE WHEN BILLED MORE THAN ONCE 21 DAY PERIOD	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X699	CAPPED DME RENTAL IS NOT COVERED BY MEDICARE WHEN BILLED MORE THAN 7 TIMES IN A 13 MONTH PERIOD	N640 Exceeds number/frequency approved/allowed within time …	CO	151	View →
X7	PRINCIPAL DIAGNOSIS DESCRIBES AN EXTERNAL CAUSE OR REQUIRES THE ICD CODE FOR THE FIRST UNDERLYING D…	MA63 Missing/incomplete/invalid principal diagnosis.	CO	16	View →
X70	PATIENT SEX INVALID	MA39 Missing/incomplete/invalid gender.	CO	7	View →
X700	HOSPITAL BED REQUIRES APPROPRIATE CODE WHEN BILLED WITH SIDE RAILS	N130 Consult plan benefit documents/guidelines for informat…	CO	16	View →
X701	KNEE ORTHOSIS AND ORTHOTIC ADDITIONS MUST BE BILLED WITH MODIFIER KX	N657 This should be billed with the appropriate code for th…	CO	4	View →
X702	THERAPEUTIC SHOES/INSERTS/MODIFICATIONS FOR DIABETICS ONLY ARE NOT COVERED BY CMS WHEN BILLED WITHO…	N657 This should be billed with the appropriate code for th…	CO	4	View →
X703	THERAPEUTIC SHOE/INSERT/MODIFICATION FOR DIABETICS ONLY IS NOT COVERED BY CMS WHEN BILLED WITHOUT A…	N657 This should be billed with the appropriate code for th…	CO	4	View →
X704	SURGICAL DRESING MODIFIER CAN CAN ONLY BE BILLED WITH SURGICAL DRESSING CODE	N519 Invalid combination of HCPCS modifiers.	CO	4	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.