Long COVID Treatment Denied by Insurance? How to Appeal

Long COVID — formally recognized as Post-Acute Sequelae of SARS-CoV-2 (PASC) and classified under ICD-10 U09.9 — affects an estimated 19 million Americans and has been designated a disability under the Americans with Disabilities Act (ADA) and Section 504 of the Rehabilitation Act by the U.S. Department of Health and Human Services. Despite this federal recognition, patients seeking treatment for long COVID symptoms routinely encounter insurance denials for specialist visits, multidisciplinary rehabilitation programs, diagnostic testing, and medications. If your long COVID care was denied, you have real options to fight back.

Why Insurers Deny Long COVID Treatment Claims

Long COVID denials are particularly frustrating because they often rest on the insurer's failure to keep pace with evolving clinical science, rather than any genuine clinical doubt about the condition:

• Disputed clinical diagnosis: Some insurers deny treatment claims by questioning whether the patient's ongoing symptoms are attributable to SARS-CoV-2 infection or represent a pre-existing condition. Because long COVID lacks a single definitive diagnostic biomarker, insurers exploit this ambiguity to apply a "condition not covered" or "not medically necessary" denial.
• Fragmentation of care across specialties: Multidisciplinary long COVID treatment programs — which typically involve pulmonology, neurology, cardiology, physical therapy, occupational therapy, and cognitive rehabilitation — may be denied because the insurer treats each component as a separate, individually authorized service, and applies different Prior Authorization Denied: How to Appeal" class="auto-link">prior authorization requirements to each. Comprehensive programs do not fit neatly into single-specialty coverage buckets.
• "Experimental" classification for long COVID protocols: Insurers may deny specific diagnostic tests (tilt-table testing for POTS, VO2 max testing for exertional intolerance) or therapeutic modalities (pacing therapy for post-exertional malaise) by characterizing them as experimental, even though these approaches are endorsed by major medical organizations and long COVID clinics affiliated with academic medical centers.
• Denial of cognitive rehabilitation: Long COVID cognitive symptoms ("brain fog") — including memory impairment, processing speed deficits, and executive dysfunction — may be denied when the insurer requires neuropsychological testing results meeting a specific severity threshold before approving cognitive rehabilitation services.
• Fatigue and autonomic dysfunction treatment denials: Conditions such as POTS (postural orthostatic tachycardia syndrome, ICD-10: G90.3) and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS, ICD-10: G93.3) are frequently comorbid with long COVID and have independent coverage implications. Insurers sometimes deny treatment by conflating these diagnoses with the broader long COVID classification.

How to Appeal a Long COVID Treatment Denial

Step 1: Establish the Diagnosis With Precision in the Record

The foundation of any long COVID appeal is a well-documented medical record establishing the connection between the acute SARS-CoV-2 infection and the ongoing symptoms. Your treating physician should document: confirmed or probable COVID-19 infection (with date and, if available, positive test result), the onset and duration of post-acute symptoms, ICD-10 U09.9 as the primary diagnosis code for long COVID, and any comorbid diagnoses (G90.3 for POTS, G93.3 for ME/CFS, R41.3 for memory impairment, etc.). The more precisely the record connects symptoms to the post-COVID condition, the harder it is for the insurer to characterize the care as unrelated to a covered condition.

Step 2: Cite Federal Recognition of Long COVID as a Disability

Include in your appeal the U.S. Department of Health and Human Services guidance from July 2021 and subsequent updates confirming that long COVID can constitute a disability under the ADA, Section 504, and Section 1557 of the ACA. While this does not directly mandate specific insurance coverage, it establishes that long COVID is a recognized, serious medical condition — undermining the insurer's "not medically necessary" rationale.

Step 3: Obtain a Multidisciplinary Team Letter of Medical Necessity

For complex long COVID cases, a Letter of Medical Necessity from a single physician may be insufficient. Request letters from each treating specialist involved in the multidisciplinary care program — the pulmonologist, neurologist, physical therapist, and cognitive rehabilitation specialist — each describing the clinical rationale for their component of treatment, citing relevant clinical guidelines (NIH RECOVER Initiative findings, CDC long COVID clinical guidance, WHO Delphi consensus recommendations).

Step 4: Challenge Experimental Classifications With Published Evidence

If a specific diagnostic test or treatment has been denied as experimental, compile peer-reviewed literature and institutional guidance from major academic medical centers that have established long COVID clinics. Tilt-table testing for POTS is standard cardiology practice (not experimental); pacing therapy for post-exertional malaise is endorsed by patient advocacy organizations and long COVID clinics. Document that the clinical approach being denied is consistent with how recognized long COVID centers are treating patients with similar presentations.

Step 5: Invoke the ACA's Prohibition on Discrimination for Pre-Existing Conditions

If the insurer attempts to deny long COVID care on the basis that it is a sequela of a prior infection, note that the ACA prohibits discrimination based on pre-existing conditions for non-grandfathered plans. Long COVID arising from a prior COVID-19 infection is not a basis for denying medically necessary treatment under compliant health plans.

Step 6: Request External Independent Review: Complete Guide" class="auto-link">External Review

If the internal appeal fails, file for external review with an IROs) Explained" class="auto-link">Independent Review Organization. External reviewers apply broadly recognized medical standards — not the insurer's proprietary criteria — and are increasingly familiar with long COVID as an established medical condition. For denials that conflict with NIH RECOVER findings or CDC clinical guidance, external reviews are a meaningful avenue for reversal.

What to Include in Your Long COVID Appeal

• Medical records documenting the acute COVID-19 infection, symptom onset, and ongoing symptom burden, with ICD-10 code U09.9 and relevant comorbid codes
• Multidisciplinary Letters of Medical Necessity from all treating specialists, each citing applicable clinical guidelines (NIH RECOVER, WHO Delphi consensus, CDC long COVID guidance)
• Peer-reviewed literature establishing that the denied diagnostic test or treatment is consistent with recognized clinical practice for long COVID
• HHS guidance confirming long COVID's status as a recognized disability under the ADA, Section 504, and Section 1557 of the ACA
• Functional assessment documentation — standardized tools such as the Post-COVID Functional Status (PCFS) scale or SF-36 health status survey — demonstrating the real-world impact of symptoms on the patient's functional capacity

Fight Back With ClaimBack

Long COVID treatment denials are especially frustrating because they penalize patients for a condition that federal agencies have formally recognized as serious and disabling. ClaimBack generates a professional appeal citing NIH RECOVER guidelines, ICD-10 U09.9, ADA disability recognition, and your insurer's specific review criteria in 3 minutes. Start your free claim analysis → Free analysis · No credit card required · Takes 3 minutes

Related Reading

• How to Write an Insurance Appeal Letter
• What Is Medical Necessity?
• Internal vs External Insurance Appeal