Denial Code Lookup

Meaning: The procedure code and the modifier on the line do not work together, or a required modifier is missing.

Common cause: A modifier was dropped, misapplied, or does not match the payer's rules for that code.

Standard fix: Review the code and modifier pairing against payer guidance, correct the modifier, and resubmit.

In DME: In DME this often involves rental/purchase modifiers like RR or NU, or KX when coverage criteria are met.

Meaning: The billed service does not match the patient's age on file.

Common cause: A code intended for a different age group, or a demographic entry error.

Standard fix: Verify the patient's date of birth and the code selection; correct whichever is wrong and resubmit.

Meaning: The diagnosis on the claim does not support the procedure billed.

Common cause: A mismatched or nonspecific diagnosis code, or a coding entry error.

Standard fix: Confirm the clinical documentation, correct the diagnosis-procedure pairing, and resubmit or appeal with the record.

Meaning: The payer requires an authorization number for this service and the one submitted is missing or wrong.

Common cause: The authorization was never obtained, expired, or the number was entered incorrectly.

Standard fix: Locate the correct authorization, attach it, and resubmit; if none exists, follow the payer's retro-authorization or appeal process.

Meaning: Something the payer needs is missing or invalid; the accompanying RARC says what.

Common cause: A missing identifier, date, attachment, or field-level error at submission.

Standard fix: Read the paired RARC to identify the exact missing element, correct it, and resubmit; this code alone is not appealable.

In DME: Frequently paired with remark codes about the ordering or rendering provider, or missing documentation like the SWO.

Meaning: The payer believes this claim or line was already submitted.

Common cause: A resubmission without the correct frequency/correction coding, or a true duplicate.

Standard fix: Check claim history first; if it is a corrected claim, resubmit with the proper correction indicators instead of a fresh claim.

Meaning: The payer thinks another insurer is primary for this patient.

Common cause: Outdated coordination-of-benefits information or the wrong payer billed first.

Standard fix: Verify primacy with the patient and payers, update COB, bill the primary first, then resubmit with the primary's remittance.

Meaning: The service date is after the patient's coverage ended.

Common cause: Coverage terminated before the date of service and eligibility was not re-checked.

Standard fix: Confirm the termination date; bill the correct active payer or the patient per policy. Prevent with eligibility checks at every visit or delivery.

Meaning: The claim arrived after the payer's filing deadline.

Common cause: Late submission, a lost claim, or delays from rework that pushed past the window.

Standard fix: If you have proof of timely submission, appeal with it; otherwise the amount is usually a write-off. Prevent with filing-deadline tracking.

Meaning: The billed amount is above what the contract or fee schedule allows; the difference is adjusted off.

Common cause: Normal contractual adjustment, or a chargemaster set far above contracted rates.

Standard fix: Usually informational, not a denial. Verify the allowed amount matches your contract; if the payer underpaid the contracted rate, appeal the underpayment.

Meaning: The payer says the service is not medically necessary under its policy for the diagnosis submitted.

Common cause: Documentation or diagnosis does not meet the payer's coverage criteria (for Medicare, the NCD/LCD).

Standard fix: Review the coverage policy, and appeal with clinical documentation that addresses the specific criteria.

In DME: The core DME denial: the record must prove the coverage criteria for the item (for example mobility limitation for a wheelchair).

Meaning: The service or item is not a covered benefit under this plan.

Common cause: A benefit exclusion, or a covered service billed in a way the plan does not recognize.

Standard fix: Check the benefit and the paired RARC; if truly excluded, bill the patient only where notice rules (like an ABN) were followed.

Meaning: Payment for this line is included in another service that has already been adjudicated, on this claim or an earlier one (bundling, NCCI edits, or a global period).

Common cause: Billing components separately where the payer bundles them, or a service billed inside another procedure's global period.

Standard fix: Check the bundling edit; if the services were genuinely separate, appeal with the appropriate modifier and documentation.

Meaning: This payer says the claim belongs to a different payer or contractor.

Common cause: Wrong jurisdiction or program (for example hospice or a Medicare Advantage plan owns the claim).

Standard fix: Identify the correct payer or jurisdiction and submit there; correct the payer setup so the routing error stops.

In DME: Common in DME when the claim went to the wrong DME MAC jurisdiction for the patient's address.

Meaning: The payer says the quantity or frequency billed is more than the documentation or policy supports.

Common cause: Refill or utilization limits exceeded, or documentation does not support the quantity.

Standard fix: Check the policy limit and the record; appeal with documentation of need, or correct the quantity.

In DME: Frequent on supplies with refill limits (CPAP supplies, diabetic testing, wound care quantities).

Meaning: The plan does not cover services for the submitted diagnosis.

Common cause: The diagnosis falls outside the covered conditions for that benefit.

Standard fix: Verify the documented condition and coding specificity; appeal if a covered, documented diagnosis applies.

Meaning: The payer does not pay this kind of provider for this service.

Common cause: Service outside the provider's enrolled specialty or scope with that payer.

Standard fix: Confirm enrollment, specialty, and scope; route to the correct enrolled provider or correct the enrollment.

Meaning: Required precertification, prior authorization, or notification was not on file when the claim processed.

Common cause: Authorization not obtained before service, or not linked to the claim.

Standard fix: If an auth exists, resubmit with it; if not, pursue the payer's retro-authorization or appeal path. Prevent with a front-end auth check.

Meaning: The service went beyond what the authorization approved (visits, units, or dates).

Common cause: Care continued past the authorized amount without an extension.

Standard fix: Request an extension or new authorization where possible, and appeal with documentation of necessity for the overage.

Meaning: This service, equipment, or drug is not a benefit of the patient's plan.

Common cause: A plan-level exclusion discovered after the fact.

Standard fix: Verify benefits; bill the patient only where proper notice was given. Prevent with benefit verification before service.

Meaning: The amount applies to the patient's deductible; it is patient responsibility.

Common cause: The patient has not met the plan deductible.

Standard fix: Bill the patient (or secondary payer) for the deductible amount; collect estimates up front where possible.

Meaning: The amount is the patient's coinsurance share.

Common cause: Standard plan cost-sharing.

Standard fix: Bill the patient or the secondary payer; make sure the coinsurance matches the plan terms.

Meaning: The amount is the patient's copay.

Common cause: Standard plan cost-sharing.

Standard fix: Collect at time of service where possible; otherwise bill the patient promptly.

Meaning: The amount reflects what a prior payer already paid or adjusted in coordination of benefits.

Common cause: Normal secondary-claim processing.

Standard fix: Usually informational on secondary claims; verify the primary's payment was applied correctly.

Meaning: On the date of service, the provider was not certified or eligible to be paid for this service.

Common cause: Enrollment, revalidation, or certification lapsed or was not effective yet.

Standard fix: Check enrollment effective dates and revalidation status; correct enrollment and resubmit or appeal with proof.

In DME: For suppliers, often tied to accreditation or supplier-number status on the date of service.

Meaning: Payment depends on another service or claim that has not been received or adjudicated.

Common cause: The qualifying claim (for example the primary procedure) was not on file when this processed.

Standard fix: Confirm the qualifying service was billed and processed, then resubmit this claim.

Meaning: The claim was sent as secondary but the primary payer's details or remittance were missing or unreadable.

Common cause: Missing primary EOB/ERA data on the secondary submission.

Standard fix: Resubmit the secondary claim with the primary payer's adjudication information attached or entered correctly.

Meaning: The patient's Medicare number or name as submitted does not match the payer's records.

Common cause: A typo, an old Medicare number, or a name mismatch.

Standard fix: Re-verify the member ID and exact name spelling against the card or eligibility response and resubmit.

Meaning: The claim was rejected as unprocessable, so it cannot be appealed; it must be corrected and resubmitted.

Common cause: A required field or identifier failed validation at intake.

Standard fix: Find the specific error in the paired codes, correct the claim, and submit a NEW claim (an appeal is not available on unprocessable claims).

Meaning: The payer wants the medical record to support this service and did not receive it.

Common cause: A documentation request was not answered, or records were not attached where required.

Standard fix: Submit the requested records via the payer's documentation process, and calendar every records-request deadline.

In DME: In DME reviews this typically means the clinical notes proving medical necessity, alongside the order and delivery proof.

Meaning: Supporting documentation the payer requires for this item is missing.

Common cause: Required attachments not included or not received.

Standard fix: Identify what the payer requires for this code and submit it with the corrected claim or in response to the request.

Meaning: Coverage for this service is governed by specific plan rules the payer is pointing you to.

Common cause: A benefit limitation or condition in the patient's plan.

Standard fix: Review the plan's benefit documents or call the payer to identify the specific rule, then bill accordingly.

Meaning: The ordering or referring provider's NPI is missing, invalid, or not on file with the payer.

Common cause: Wrong or missing NPI, or the ordering provider is not enrolled where enrollment is required.

Standard fix: Verify the ordering provider's NPI and enrollment status, correct the claim, and resubmit.

In DME: A classic DME remark: Medicare requires the ordering physician to be enrolled for the supplier claim to pay.

Meaning: The rendering provider's NPI is missing or does not validate.

Common cause: The rendering NPI was omitted, mistyped, or does not match payer records.

Standard fix: Correct the rendering provider NPI (and its match to the billed group) and resubmit.

Meaning: The required time frame between this service or supply and a related service or supply was not met.

Common cause: A required interval between related services (for example between an evaluation and delivery, or a recertification window) was missed.

Standard fix: Identify the specific timing rule with the payer; correct and resubmit where possible, or appeal with evidence the timing was met.

In DME: Shows up around DME recertification windows and rental period timing.

Meaning: Law excludes this service from coverage under the program (for example Medicare statutory exclusions).

Common cause: The item or service is outside the program's legal benefit scope.

Standard fix: Do not appeal a true statutory exclusion; bill the patient where proper notice was given, or the correct alternative payer.

Meaning: The payer wants a fresh, corrected claim that includes what was missing.

Common cause: Paired with codes identifying the missing element.

Standard fix: Correct the identified gap and submit a new claim rather than an appeal.