Reference Library

Insurance Denial & Adjustment Code Library

When your Explanation of Benefits (EOB) shows a denial or adjustment, it lists a code — but not what it means or what to do about it. This library covers 69 CARC and RARC codes with plain-English explanations and specific action steps.

69Codes Covered
59CARC Codes
10RARC Codes
CARCClaim Adjustment Reason Code — explains why a payment was reduced or denied
RARCRemittance Advice Remark Code — provides additional context or instructions
EOBExplanation of Benefits — the statement your insurer sends after processing a claim

Contractual Obligation

53 codes
CARC1

Deductible Amount

This portion of your bill is being applied to your annual deductible. You owe this amount until your deductible is met for the year.

See action steps →
CARC2

Coinsurance Amount

After your deductible is met, you still owe a percentage of each claim — this is your coinsurance share.

See action steps →
CARC3

Copay Amount

A fixed dollar amount you owe for this visit or service as defined by your plan.

See action steps →
CARC4

The service/equipment is not covered

Your insurance plan does not cover this specific service, item, or procedure at all.

See action steps →
CARC5

The service/treatment is not authorized

Your insurer says no prior authorization was obtained for this service before it was performed.

See action steps →
CARC6

The procedure/revenue code is inconsistent with the modifier

A billing code modifier doesn't match the procedure code, causing the claim to be adjusted or denied.

See action steps →
CARC7

The procedure code is inconsistent with the place of service

The billed procedure doesn't match the type of facility or location where the service was performed.

See action steps →
CARC8

The procedure code is inconsistent with the provider type

The billed service doesn't match the type of provider who performed it according to their license or specialty.

See action steps →
CARC9

The diagnosis is inconsistent with the procedure

The diagnosis code on the claim doesn't medically support the procedure that was billed.

See action steps →
CARC10

The diagnosis is inconsistent with the patient's age

The billed diagnosis doesn't match the patient's age — for example, a pediatric condition billed for an adult.

See action steps →
CARC11

The diagnosis is inconsistent with the patient's gender

The billed diagnosis doesn't match the gender on file for the patient.

See action steps →
CARC12

The diagnosis is inconsistent with the admission type

The diagnosis doesn't match how the admission was categorized (e.g., elective vs. emergency).

See action steps →
CARC15

Payment adjusted because the submitted authorization number is missing, invalid, or does not apply

The prior authorization number on the claim is missing, wrong, or doesn't match what the insurer has on file.

See action steps →
CARC16

Claim/service lacks information or has submission/billing error(s)

The claim is missing required information or contains errors that prevent processing.

See action steps →
CARC18

Duplicate claim/service

Your insurer flagged this claim as a duplicate of one already processed.

See action steps →
CARC19

Claim denied because this is a work-related injury/illness and thus the liability of the Worker's Compensation Carrier

The insurer says this injury or illness should be covered by workers' compensation, not your health plan.

See action steps →
CARC22

This care may be covered by another payer per coordination of benefits

Your insurer thinks another insurance plan — like a spouse's plan — should pay first.

See action steps →
CARC23

The impact of prior payer(s) adjudication including payments and/or adjustments

The payment reflects what's left after another insurer already paid part of this claim.

See action steps →
CARC24

Charges are covered under a capitation agreement/contract

Your provider is paid a fixed monthly rate for your care, so no additional fee-for-service payment is made.

See action steps →
CARC26

Expenses incurred prior to coverage

The service was performed before your insurance coverage was active.

See action steps →
CARC27

Expenses incurred after coverage terminated

Your insurance had already ended when this service was performed.

See action steps →
CARC29

The time limit for filing has expired

The claim was not submitted to the insurer within the required filing deadline.

See action steps →
CARC31

Patient cannot be identified as our insured

The insurer can't match the patient to an active member record.

See action steps →
CARC32

Our records indicate that this dependent is not an eligible dependent as defined

The person receiving care doesn't qualify as a dependent under the plan's rules.

See action steps →
CARC35

Lifetime benefit maximum has been reached

Your plan's lifetime coverage cap for this type of service has been exhausted.

See action steps →
CARC45

Charge exceeds fee schedule/maximum allowable

The provider billed more than the contracted or allowed rate. You're only responsible for your share of the allowed amount — not the billed amount.

See action steps →
CARC47

This (these) diagnosis(es) is (are) not covered, missing, or are invalid

The diagnosis code on the claim is missing, invalid, or not covered by your plan.

See action steps →
CARC49

These are non-covered services because this is a routine exam or screening procedure done in conjunction with a routine exam

Your insurer is treating this service as part of a routine exam rather than a medically necessary visit.

See action steps →
CARC50

These are non-covered services because this is not deemed a 'medical necessity' by the payer

Your insurer decided this service wasn't medically necessary, so they won't pay for it.

See action steps →
CARC51

These are non-covered services because this is a pre-existing condition

The insurer is denying this claim because your condition existed before your coverage started.

See action steps →
CARC55

Procedures or services are not compatible with this type of service

The billed procedure can't be performed or billed alongside another procedure that was already paid.

See action steps →
CARC58

Treatment was deemed by the payer to have been rendered in an inappropriate or invalid place of service

The location where this service was performed isn't appropriate for this type of care per your insurer.

See action steps →
CARC59

Processed based on multiple or concurrent procedure rules

When multiple procedures are performed at the same time, the payment for secondary procedures is reduced.

See action steps →
CARC101

Predetermination: anticipated payment upon completion of services or claim adjudication

This EOB is a pre-determination of what your insurance would pay — not a final claim decision.

See action steps →
CARC107

The related or qualifying claim/service was not identified on this claim

A required reference to a related claim (like a referring provider or parent claim) is missing.

See action steps →
CARC109

Claim/service not covered by this payer/contractor. You must send the claim/service to the correct payer/contractor.

You submitted the claim to the wrong insurance company.

See action steps →
CARC119

Benefit maximum for this time period or occurrence has been reached

You've used all the allowed visits, days, or dollar amount for this type of benefit this year.

See action steps →
CARC125

Submission/billing error(s). At least one Remark Code must accompany this code.

There's a billing or submission error — the remark code on the same line explains the specific issue.

See action steps →
CARC133

The disposition of this claim/service is pending further review

Your insurer hasn't made a final decision yet — the claim is still under review.

See action steps →
CARC140

Patient/insured health identification number and name do not match

The name and insurance ID number on the claim don't match what's in the insurer's system.

See action steps →
CARC151

Payment adjusted because the payer deems the information submitted does not support this many/frequency of services

Your insurer says the number or frequency of services billed doesn't seem clinically reasonable based on the information submitted.

See action steps →
CARC170

Payment is denied when performed/billed by this type of provider

This service isn't covered when performed by the type of provider who billed it.

See action steps →
CARC171

Payment denied for absence of, or exceeded, precertification/authorization

Prior authorization wasn't obtained, or the service went beyond what was authorized.

See action steps →
CARC176

Services not related to the specific accident/illness

The service doesn't appear to be connected to the injury or illness for which you're being treated under a specific claim or benefit.

See action steps →
CARC185

Do not resubmit; we will reprocess this claim after the contract is finalized

Your insurer is asking you to wait — the provider's contract is being resolved and the claim will be reprocessed automatically.

See action steps →
CARC192

Non-standard adjustment code from paper remittance

This adjustment was made based on information from a paper (non-electronic) process and doesn't have a standard code.

See action steps →
CARC197

Precertification/authorization/notification/pre-treatment absent

Required advance approval wasn't obtained before this service was performed.

See action steps →
CARC200

Expenses incurred during lapse in coverage

Coverage had lapsed at the time the service was performed — usually due to a missed premium.

See action steps →
CARC226

Information requested from the Billing/Rendering Provider was not provided or not provided timely or was insufficient/incomplete

The insurer asked the provider for more information but didn't get it in time.

See action steps →
CARC252

An attachment/other documentation is required to adjudicate this claim/service

Your insurer needs additional documents from the provider to process this claim.

See action steps →
CARC253

Sequencing of therapy and/or diagnostic treatment is incorrect

Your insurer says the order in which treatments were tried doesn't follow their required clinical pathway.

See action steps →
CARCB7

This provider was not certified/eligible to be paid for this procedure/service on this date of service

The provider who performed this service wasn't credentialed or eligible to bill for it on the date of your visit.

See action steps →
CARCB9

Services not covered because the patient is enrolled in a Hospice program

If a patient is in hospice, most curative treatments are no longer covered by Medicare or the plan.

See action steps →

Non-Covered

6 codes

Remark

10 codes
RARCN1

Alert: You may appeal this decision

You have the right to file a formal appeal of this payment decision.

See action steps →
RARCN30

Patient ineligible for this service

The patient doesn't meet the eligibility requirements for this specific service.

See action steps →
RARCN115

This decision was based on a Local Coverage Determination (LCD)

A Medicare local policy in your geographic area was used to decide whether to cover this service.

See action steps →
RARCN130

Consult plan benefit documents/summary plan description for further information

Check your plan documents for the specific rule that caused this adjustment.

See action steps →
RARCN517

Resubmit a separate claim for this service

This service needs to be billed on its own separate claim — it can't be included with the current one.

See action steps →
RARCMA01

If you do not agree with what we approved for these services, you may appeal our decision

You can formally challenge the payment amount or denial decision.

See action steps →
RARCMA04

Secondary payment cannot be considered without the identity of or payment information from the primary payer

The secondary insurer can't process this until they get the primary insurer's payment information.

See action steps →
RARCMA07

Alert: This claim has been forwarded to the patient's additional plan

Your insurer has automatically sent this claim to your secondary insurance for additional processing.

See action steps →
RARCMA61

Missing/incomplete/invalid social security number or health insurance claim number

The patient's Social Security Number or Medicare claim number on the form is missing or incorrect.

See action steps →
RARCMA62

Alert: This claim has been split for processing

Your insurer divided this claim into multiple parts for processing.

See action steps →

Got a denial code on your EOB?

Upload your Explanation of Benefits and our analyzer will identify every adjustment code, explain what it means, and tell you if it’s worth disputing.

Analyze My EOB Free →