The Complete Guide to Appealing Insurance Denials

What It Means

The payer has determined the service does not meet their criteria for medical necessity.

Common In

How to Appeal

• 1.Obtain a peer-to-peer review with the payer's medical director
• 2.Submit clinical documentation supporting medical necessity (notes, test results, prior treatment failures)
• 3.Cite peer-reviewed clinical literature and clinical practice guidelines
• 4.Reference CMS LCD/NCD criteria and show how the patient meets them

Regulations to Cite

• §CMS LCD/NCD Database
• §ERISA Section 503
• §State external review laws

What It Means

The service required prior authorization that was not obtained before the date of service.

Common In

How to Appeal

• 1.If auth was obtained, provide the authorization number and approved date range
• 2.If auth was sought but denied, include the denial and explain why services were still necessary
• 3.For emergencies, cite state laws allowing retrospective authorization
• 4.If the payer provided incorrect information about auth requirements, document the call (date, time, reference number, rep name)
• 5.Request retroactive authorization with medical necessity documentation

Regulations to Cite

• §State retrospective auth laws
• §CMS Medicare Advantage auth requirements
• §ACA Section 2719
• §ERISA appeal rights

What It Means

The claim is missing required information or contains data that does not match payer records.

Common In

How to Appeal

• 1.Review the remittance for specific missing data elements
• 2.Verify patient demographics match the payer's enrollment records
• 3.Resubmit with corrected information and a cover letter identifying the corrections
• 4.Contact the payer to identify exactly which field(s) triggered the denial

Regulations to Cite

• §HIPAA 837 Transaction Standards
• §Payer-specific billing guidelines

What It Means

The billed service is not covered based on the terms of the patient's benefit plan.

Common In

How to Appeal

• 1.Request the specific benefit plan language that excludes the service
• 2.Provide peer-reviewed literature supporting the medical necessity
• 3.Cite applicable LCDs/NCDs that cover the service under the billed diagnosis
• 4.Request external review if internal appeal is denied

Regulations to Cite

• §ACA external review requirements
• §ERISA appeal rights
• §State insurance regulations

What It Means

The benefit for this service is included in the payment/allowance for another service already adjudicated.

Common In

How to Appeal

• 1.If services were distinct, use appropriate modifiers (25, 59, XE, XS, XP, XU)
• 2.Reference CMS NCCI edits to verify the bundling is correct
• 3.Provide documentation showing the services were separate and distinct
• 4.For E/M + procedure, document that the E/M was a separately identifiable service

Regulations to Cite

• §CMS NCCI Policy Manual
• §CPT Coding Guidelines
• §Modifier 25 Guidelines

What It Means

The diagnosis code does not support the medical necessity of the procedure code billed.

Common In

How to Appeal

• 1.Review the medical record for additional or more specific diagnosis codes that support the procedure
• 2.Provide clinical documentation showing the medical decision-making process
• 3.Reference LCD/NCD coverage criteria and demonstrate the diagnosis meets requirements
• 4.Request a peer-to-peer review with the medical director

Regulations to Cite

• §CMS LCD/NCD Database
• §ICD-10-CM Official Guidelines

What It Means

The procedure code billed is inconsistent with the modifier used, or the combination is not covered under the patient's benefit plan.

Common In

How to Appeal

• 1.Request a review of the modifier usage with supporting operative notes
• 2.Cite CPT guidelines showing the modifier is appropriate for the procedure performed
• 3.Reference payer-specific modifier policies and demonstrate compliance
• 4.Include a letter of medical necessity from the performing provider

Regulations to Cite

• §CPT Appendix A - Modifier Guidelines
• §CMS NCCI Edits

What It Means

An exact duplicate claim or service has already been processed and paid.

Common In

How to Appeal

• 1.If services were distinct, provide documentation showing different dates, times, or anatomical sites
• 2.Use appropriate modifiers (76, 77, 59, XE, XS, XP, XU) to distinguish services
• 3.Include operative reports or progress notes showing separate encounters
• 4.Reference CMS NCCI unbundling guidelines

Regulations to Cite

• §CMS NCCI Policy Manual Chapter 1
• §CPT Modifier Guidelines

What It Means

The claim was not submitted within the payer's timely filing deadline.

Common In

How to Appeal

• 1.Document the original submission date with proof (clearinghouse report, fax confirmation)
• 2.If delayed due to other payer processing, provide the primary EOB date and calculate from that
• 3.Cite state prompt-pay laws that extend filing deadlines in specific circumstances
• 4.If the payer caused the delay (wrong information, system issues), document the payer error

Regulations to Cite

• §State timely filing laws
• §CMS Medicare timely filing (1 year)
• §Contract-specific deadlines

What It Means

The payer believes another insurance should be primary for this claim based on coordination of benefits.

Common In

How to Appeal

• 1.Verify COB order with the patient and submit a COB questionnaire response
• 2.Provide a denial from the alleged primary payer as proof your payer is primary
• 3.Reference state coordination of benefits rules
• 4.If Medicare Secondary Payer, document the MSP type and provide the primary EOB

Regulations to Cite

• §CMS Medicare Secondary Payer Manual
• §State COB regulations
• §NAIC Model Act

What It Means

The patient's coverage was not active on the date of service.

Common In

How to Appeal

• 1.Verify the patient's eligibility on the date of service using the payer portal
• 2.If coverage was retroactively terminated, request the effective termination date
• 3.Contact the employer/group to confirm coverage status
• 4.If emergency services, cite EMTALA obligations and state emergency coverage mandates

Regulations to Cite

• §EMTALA (42 USC 1395dd)
• §ACA Section 2719A
• §State continuity of coverage laws

What It Means

The billed amount exceeds the payer's contracted or legislated fee arrangement.

Common In

How to Appeal

• 1.Review your contract for the correct fee schedule and verify the reduction is accurate
• 2.If out-of-network, reference state balance billing protections (No Surprises Act)
• 3.For unusual circumstances, submit with supporting documentation for higher reimbursement
• 4.Request the payer's fee schedule for the specific code and compare to your contract

Regulations to Cite

• §No Surprises Act (2022)
• §State balance billing laws
• §Provider contract terms

What It Means

The patient has exhausted their benefit limit for this service category within the plan period.

Common In

How to Appeal

• 1.Request the exact benefit limit and verify the count of visits/services applied
• 2.For mental health, cite MHPAEA — visit limits may violate parity if medical/surgical benefits don't have comparable limits
• 3.Request a medical necessity exception for continued treatment
• 4.Provide documentation showing the patient will deteriorate without continued services

Regulations to Cite

• §MHPAEA
• §ACA Essential Health Benefits
• §Plan SPD

What It Means

The payer has determined the documentation does not support the number or frequency of services billed.

Common In

How to Appeal

• 1.Provide evidence of medical necessity for each unit or visit beyond the standard frequency
• 2.Document the patient's response to treatment and why additional visits were necessary
• 3.Reference clinical guidelines supporting the frequency for this patient's condition severity
• 4.Submit a letter of medical necessity from the treating provider

Regulations to Cite

• §CMS LCD frequency limits
• §Clinical practice guidelines

What It Means

The diagnosis code is not recognized or covered by the payer for the service billed.

Common In

How to Appeal

• 1.Verify the ICD-10 code is valid and specific enough
• 2.Provide clinical documentation supporting the diagnosis
• 3.Reference LCDs/NCDs that list the diagnosis as covered
• 4.If using a new ICD-10 code, provide a crosswalk to the previous code

Regulations to Cite

• §ICD-10-CM Official Guidelines
• §CMS LCD/NCD Database

What It Means

The service or equipment is not covered under the patient's current benefit plan.

Common In

How to Appeal

• 1.Verify which entity covers the service (medical plan vs. carve-out vs. Medicare FFS)
• 2.If incorrectly carved out, provide the plan document showing coverage
• 3.For Medicare Advantage, verify if the service should go to original Medicare
• 4.Contact the payer to identify the correct entity to bill

Regulations to Cite

• §Medicare Advantage coverage rules
• §State Medicaid managed care contracts

What It Means

The service is not separately payable because it is included within the global surgical package period.

Common In

How to Appeal

• 1.Verify the global period for the original procedure (10-day or 90-day)
• 2.If the visit addressed an unrelated condition, use modifier 24 (unrelated E/M post-op)
• 3.For complications requiring additional surgery, use modifier 78 (return to OR)
• 4.Reference CMS global surgery rules to verify what is and is not included

Regulations to Cite

• §CMS Global Surgery Policy (CMS-1500)
• §CPT Global Package Guidelines

What It Means

The amount applied to the patient's deductible.

Common In

How to Appeal

• 1.This is usually correct — verify the deductible amount matches the plan
• 2.If the deductible was already met, provide EOBs showing prior deductible payments
• 3.For preventive services, cite ACA first-dollar coverage requirements (no deductible for preventive)
• 4.Verify the claim was processed under the correct benefit category

Regulations to Cite

• §ACA Section 2713 (preventive care)
• §Plan SPD

What It Means

The amount of coinsurance the patient owes based on their plan benefits.

Common In

How to Appeal

• 1.Verify the coinsurance percentage matches the plan documents
• 2.Check if the service should be covered at a different tier (in-network vs. out-of-network)
• 3.For preventive services, ACA requires $0 cost-sharing
• 4.Verify the allowed amount is correct before calculating coinsurance

Regulations to Cite

• §ACA cost-sharing provisions
• §Plan SPD
• §No Surprises Act

What It Means

The payment was adjusted to reflect the impact of prior payer(s) adjudication, including payments and/or adjustments.

Common In

How to Appeal

• 1.Request an extension of the authorization with updated clinical documentation
• 2.Demonstrate medical necessity for services beyond the authorized amount
• 3.If the auth covered the service, provide the authorization details
• 4.Cite state laws requiring retroactive auth for medically necessary services
• 5.Provide the complete primary EOB to facilitate secondary adjudication

Regulations to Cite

• §State retrospective auth laws
• §CMS conditions of coverage
• §CMS COB Policy Manual