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N650RARC CodeEligibility Last Reviewed August 2026 Source: X12 / WPC

N650 Remark Code — Policy Not in Effect for Date of Loss

N650 is a Remittance Advice Remark Code (RARC) that appears alongside a CARC (usually CO-26, CO-27, or CO-28) to explain that the insurance policy was not active on the date of loss or date of service. This code is most common on auto insurance, property, and workers compensation claims, but can also appear on health claims when coverage eligibility is date-specific. The payer is stating that no coverage exists under this specific policy for the date in question.

Resolution Steps Appeal GuidanceFAQ

Quick Answer

N650 means the insurance policy was not in effect on the date of loss or service. This is a remark code (RARC), not a denial code — it appears alongside a CARC like CO-26, CO-27, or CO-28. To resolve it, verify the correct policy number and effective dates, check if coverage exists under a different policy or insurer, and bill the correct insurer or the patient if no coverage exists.

Official Definition

This policy was not in effect for this date of loss. No coverage is available.

Code Type
RARC — Other Adjustment
Category
Eligibility

What This Code Means

N650 is a Remittance Advice Remark Code (RARC) that appears alongside a CARC (usually CO-26, CO-27, or CO-28) to explain that the insurance policy was not active on the date of loss or date of service. This code is most common on auto insurance, property, and workers compensation claims, but can also appear on health claims when coverage eligibility is date-specific. The payer is stating that no coverage exists under this specific policy for the date in question.

Status

Review Eligibility

Recommended Action

1Review the denial message and the exact date of service.
2Verify eligibility, effective and termination dates, product or plan, member ID, and any managed-care or Medicare Advantage enrollment relevant to the claim.
3Check for other active coverage, retroactive changes, COB, or payer assignment before moving the balance.
4Correct or rebill only when the research identifies the actual coverage or claim-data error. Do not assume the patient is responsible from an eligibility code alone.

Same standard code · different claim context

How N650 can be investigated across specialties

CARCs and RARCs are not separate code sets for radiology, gastro, hospital, or professional billing. The code meaning stays standardized; the claim fields, documentation, payer rules, and next checks change by setting.

Professional / Office

Check CMS-1500/837P fields, rendering/billing NPI, diagnosis, modifier, place of service, authorization, and payer policy.

Hospital / Facility

Check UB-04/837I bill type, revenue code, status, inpatient/outpatient rules, authorization, and line-level ERA detail.

Radiology

Check 26/TC component billing, imaging authorization, medical necessity, site of service, same-day edits, and referring provider data.

Gastroenterology

Check procedure relationships, screening vs diagnostic context, modifiers, pathology/anesthesia relationships, authorization, and payer edits.

Behavioral Health

Check provider credential, behavioral-health carve-out, authorization, units/time, telehealth, place of service, and plan-specific rules.

Therapy / Rehab

Check therapy modifiers, timed units, benefit limits, authorization, plan of care/documentation, and NCCI/payer edits.

DME / Supplies

Check HCPCS, modifiers, same/similar equipment, medical necessity, proof of delivery, authorization, and supplier enrollment.

Lab / Pathology

Check CLIA, ordering/referring data, diagnosis support, frequency, panel bundling, specimen/documentation, and payer medical policy.

Financial Impact

Avg. Denial Rate
1-3% of claims (higher on auto/wc)
Days to Resolve
14-45 days
Appeal Success Rate
30-50% (depends on finding active coverage)
Revenue Risk
High — may become patient responsibility if no coverage found

Should This Go to Coding?

USUALLY NOT CODING

Do not send every denial to Coding. Coding is appropriate only when the resolution requires coding judgment rather than an administrative or payer follow-up action.

Send to Coding When

A CPT/HCPCS, ICD-10, modifier, NCCI edit, code pair, sequencing rule, or documentation-to-code decision must be reviewed.

Do Not Send to Coding When

Eligibility or member ID issue.
COB or wrong payer.
Missing authorization with no coding question.
Timely filing.
Contractual adjustment such as validated CO-45.
Deductible, coinsurance, or copay after secondary coverage is checked.

Simple rule: If you would have to choose, change, or defend a CPT/HCPCS, ICD-10, modifier, code pair, NCCI edit, or documentation-to-code decision, Coding should review it.

Corrected Claim, Reconsideration, Appeal, or Something Else?

RESEARCH FIRST

Use the ERA/EOB, RARC, payer portal, policy, claim history, and internal workflow to decide between corrected claim, reconsideration, appeal, coding review, payer follow-up, patient responsibility, or adjustment.

Corrected claim: use when your original claim data was wrong or incomplete.
Reconsideration: use when the claim was processed but the payer should review it again, often with added information.
Appeal: use when you disagree with the payer decision and have evidence supporting payment.
Do not duplicate: do not send multiple paths at once unless the payer specifically instructs you to.
See payer-specific submission methods

Should I Adjust This Balance?

DO NOT ADJUST YET

Treat the balance as recoverable until research shows otherwise. The goal of insurance collections is to resolve the denial and obtain payment when a valid recovery path exists.

Read the full ERA/EOB, including all CARC and RARC codes.
Review payer portal status, claim history, and prior notes.
Check eligibility, COB, coding, authorization, medical necessity, and payer policy as relevant.
Choose the correct action: corrected claim, reconsideration, appeal, coding review, payer follow-up, patient responsibility, or adjustment.
Adjust only when the reason is confirmed, the claim is not recoverable, and your organization authorizes the adjustment.

Collections rule: A denial code by itself does not automatically mean write-off. Work the claim for payment first when a valid recovery path exists.

What Should My Account Note Say?

4-Part Note Formula

WHAT HAPPENED + WHAT YOU REVIEWED/DID + WHY THAT ACTION WAS CORRECT + WHAT HAPPENS NEXT

General Denial Note

REVIEWED ERA/EOB FOR N650. PAYER PROCESSED/DENIED $[AMOUNT] DUE TO [DENIAL REASON + CARC/RARC]. VERIFIED [PORTAL/ELIGIBILITY/CLAIM HISTORY/POLICY/CODING/AUTHORIZATION]. [ACTION TAKEN] BECAUSE [WHY THIS ACTION IS SUPPORTED]. REMAINING BALANCE $[BALANCE]. WILL FOLLOW UP IN [TIMEFRAME] OR NO FURTHER PAYER ACTION REQUIRED.

Adjustment Note

REVIEWED ERA/EOB FOR N650. PAYER APPLIED $[AMOUNT] AS [CONTRACTUAL/NONPAYABLE REASON]. VERIFIED FINAL ADJUDICATION, [CONTRACT/POLICY/CODING REVIEW], AND NO ADDITIONAL RECOVERY PATH. ADJUSTED/REQUESTED ADJUSTMENT OF $[AMOUNT] PER ORGANIZATIONAL WORKFLOW. REMAINING BALANCE $[BALANCE]. [FOLLOW-UP OR RESOLVED].

Current decision: DO NOT ADJUST YET. Do not document an action you did not actually perform. Do not say a payment was posted unless you personally posted it.

How to Investigate

Investigation Checklist

Step-by-Step Workflow

1Verify the exact date of loss or date of service on the claim
2Check the policy effective and expiration dates with the payer
3Ask the patient for all current and past insurance cards
4Check if the patient has coverage under a different policy or insurer
5Verify if the policy was retroactively reinstated (common with auto and health)
6Check for retroactive Medicaid eligibility if applicable
7Confirm the correct policy number was billed (not a typo)

Common Causes

1
Policy expired before the date of loss/service
2
Policy effective date is after the date of loss/service
3
Wrong policy number billed
4
Coverage exists with a different insurer
5
Policy cancelled or lapsed due to non-payment
6
Patient changed insurance and old policy was billed
7
Retroactive policy reinstatement not yet processed

Related Denial Codes

CO-26CO-27CO-28CO-31

Step-by-Step Resolution

If wrong policy billed: resubmit to the correct insurer with the correct policy number
If coverage with different insurer: bill the correct insurer
If policy retroactively reinstated: appeal with reinstatement documentation
If retroactive Medicaid eligibility: resubmit with updated eligibility
If no coverage exists: bill the patient (ensure ABN or notice was provided)
If patient had no insurance on DOS: document and write off or bill patient

Appeal Guidance

Appeal Grounds

The policy was in effect on the date of loss, or coverage was retroactively reinstated, or the wrong policy number was originally billed.

Appeal Letter Template

We are appealing the N650 remark (with [CARC code]) for [service], DOS [date]. The policy was in effect on the date of service as shown in the attached documentation. [Or: coverage was retroactively reinstated as shown in the attached letter.] We request reprocessing of the claim.

Required Documentation Checklist

Proof of policy effective dates
Retroactive reinstatement letter from insurer
Correct policy number and insurer information
Patient statement confirming coverage on DOS

Real-World Examples

Auto Claim — Wrong Policy Billed

Won
Situation

Patient was in a car accident and the provider billed an old auto policy. The auto insurer denied with CO-26 + N650.

Outcome

Contacted the patient, obtained the current auto policy number, and resubmitted to the correct insurer. Paid within 21 days.

Medicare — Retroactive Enrollment

Won (delayed)
Situation

Patient had Medicare but the DOS was before their Part B effective date. Medicare denied with CO-28 + N650.

Outcome

Patient applied for retroactive Medicare enrollment due to a qualifying event. Once approved (60 days), resubmitted the claim. Paid.

Patient Responsibility

Can you bill the patient?
Yes — with conditions
When
Billable to the patient if no other coverage exists for the date of service and the patient was properly informed.

Before billing the patient, exhaust all options to find active coverage — including other policies, retroactive reinstatements, and secondary insurers.

Payer-Specific Notes

Auto Insurance

N650 is very common on auto claims. Verify the exact date of loss (accident date) against the policy effective and expiration dates. The patient may have a different auto policy that was active on the accident date.

Workers Compensation

On workers comp claims, N650 may indicate the employer was not covered by this WC policy on the injury date. Verify the correct employer policy and carrier.

Medicare

Medicare may issue N650 when coverage was not active on the DOS — verify Medicare Part A/B effective dates. Check for retroactive enrollment or premium payment reinstatement.

Medicaid

Medicaid may issue N650 if the patient was not eligible on the DOS. Check for retroactive Medicaid eligibility (up to 3 months prior in many states).

Commercial

Commercial payers issue N650 when the policy effective date is after the DOS or the policy lapsed before the DOS. Verify with the employer group or patient.

Frequently Asked Questions About N650

Educational Platform Notice

DenialPro is an educational platform designed to teach medical billing denial management.

Do not submit Protected Health Information (PHI), personally identifiable information (PII), patient names, member IDs, claim numbers, dates of birth, medical record numbers, or confidential healthcare information.

Always verify guidance with official payer policies, CMS guidance, coding guidelines, and applicable regulations.

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