Humana Sleep Apnea or CPAP Denied? Complete Appeal Guide

Sleep apnea is one of the most common conditions treated with durable medical equipment (DME), and CPAP therapy is one of the most commonly denied DME claims. If Humana denied your CPAP machine, related supplies, or sleep apnea testing, this guide explains exactly why these denials happen and how to appeal effectively.

Humana's Sleep Apnea Coverage Framework

For Humana Medicare Advantage members, CPAP coverage is governed by Medicare's Local Coverage Determination L33718, issued by CMS. Humana must follow LCD L33718 for MA plan CPAP coverage decisions. For commercial Humana members, Humana's own Medical Coverage Policy for positive airway pressure devices applies.

Under LCD L33718, CPAP therapy is covered when:

Criterion 1 (Moderate-to-severe OSA): The sleep study shows an Apnea-Hypopnea Index (AHI) or Respiratory Disturbance Index (RDI) of 15 or more events per hour, regardless of symptoms; OR

Criterion 2 (Mild OSA with symptoms): The sleep study shows an AHI or RDI of 5 to 14 events per hour, AND the patient has at least one of the following: excessive daytime sleepiness, impaired cognition, mood disorders, insomnia, or documented hypertension, ischemic heart disease, or history of stroke.

The sleep study itself must meet specific requirements: it must be a polysomnography (PSG) conducted in a certified sleep lab, a home sleep apnea test (HSAT/HSAT device), or a split-night study. The study must be performed before CPAP is prescribed and must be conducted within 12 months before the date the CPAP is ordered.

The 90-Day CPAP Compliance Trial

One of the most misunderstood aspects of Medicare/Humana CPAP coverage is the 90-day compliance trial. Under LCD L33718:

1. Humana covers a CPAP device for an initial three-month trial period.
2. Within 91 days of starting CPAP therapy, your prescribing physician must document that you have been compliant with therapy AND that you are benefiting from it.
3. Compliance means: using CPAP for at least 4 hours per night on 70% of nights during any consecutive 30-day period within the first 90 days.
4. If compliance is not documented, Humana will deny continued coverage, and you may be billed for the device.

CPAP machines with data recording (virtually all modern devices) generate compliance reports showing exact nightly usage. Your sleep medicine provider or DME supplier should pull this report and submit it with documentation of clinical benefit (improved symptoms, blood pressure, daytime alertness).

Common compliance-related denial reasons:

• Usage data not submitted to Humana
• Patient used CPAP but did not meet the 4-hour/70% threshold
• Physician did not complete a follow-up visit within the required window
• Data was submitted but Humana's system did not receive or process it

CPAP Replacement vs. New Equipment

Replacement CPAP machines and supplies have different coverage rules than initial equipment:

CPAP machine replacement: Medicare and Humana allow CPAP machine replacement every 5 years if the device is broken, lost, or no longer functioning. You must still document medical necessity at the time of replacement.

CPAP mask replacement: Masks, cushions, and headgear are replaced more frequently — typically a full mask every 3 months, with more frequent replacement for cushions and filters.

Supply replacement: Humana uses frequency limits for replacement supplies. Submitting claims for supplies more frequently than allowed results in automatic denial. Check Humana's current supply replacement frequency limits before ordering.

A common denial for replacement supplies is "frequency limit not met" — meaning Humana shows you already received the item within the covered period. If this is incorrect, request proof from Humana showing when the prior claim was paid.

Why Humana Denies Sleep Apnea Claims

AHI does not meet threshold: The sleep study results show an AHI below 15 with no documented symptoms — the treatment does not meet Criterion 1 or Criterion 2. If you believe you have significant symptoms that weren't documented on the study requisition, have your physician amend the order and resubmit.

Home sleep study technically deficient: HSATs sometimes fail to capture sufficient data (equipment issues, patient disconnects leads) and produce an inadequate study. In that case, an in-lab polysomnography should be performed.

Compliance not documented: The 90-day compliance data was not submitted, or did not meet the 4-hour/70% threshold.

Prescribing physician not qualified: LCD L33718 requires the treating physician to have specific qualifications. If the prescribing provider does not meet those requirements, Humana will deny the claim.

DME supplier issues: The supplier must be enrolled in Medicare and meet CMS quality standards. Denials sometimes result from the supplier's billing errors rather than coverage issues.

How to Appeal a Humana CPAP or Sleep Apnea Denial

Step 1: Identify the exact denial reason. Request the written EOB or Prior Authorization Denied: How to Appeal" class="auto-link">Prior Authorization Denial notice specifying which LCD L33718 criterion was not met or which compliance requirement was not satisfied.

Step 2: Pull your CPAP compliance report. Obtain the SD card data or cloud-based compliance report from your CPAP machine. Have your sleep medicine provider review and certify it.

Step 3: Get a physician compliance note. Your physician must document: (1) you were seen within the required 90-day window, (2) your CPAP usage data meets the 4-hour/70% threshold, and (3) you are benefiting from therapy (symptom improvement, blood pressure improvement, or other clinical benefit).

Step 4: Verify sleep study documentation. Confirm the sleep study report is in your medical record, is dated within 12 months of the CPAP order, and clearly states the AHI/RDI with supporting data. Have your physician document any comorbidities (hypertension, heart disease, stroke history) if your AHI is in the 5–14 range requiring Criterion 2.

Step 5: File the internal appeal with Humana at 1-877-320-1235, including the sleep study report, compliance data, and physician letter.

Step 6: Request External Independent Review: Complete Guide" class="auto-link">external review if the internal appeal is denied. For Medicare Advantage, proceed to QIC review.

Fight Back With ClaimBack

ClaimBack guides you through building a Humana sleep apnea appeal that addresses LCD L33718 criteria, compliance documentation requirements, and the specific reason Humana cited for denying your CPAP coverage. Start at https://claimback.app/appeal and get your sleep apnea treatment covered.

Related Reading

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