Medicare Denied Preventive Screening — Colonoscopy, Mammogram, PSA Appeals

Preventive screenings save lives. Medicare knows this, which is why it covers colonoscopies, mammograms, PSA tests, bone density scans, and dozens of other screening services — often at no cost to you. Yet billing errors and inappropriate denials leave seniors with unexpected charges every day.

If you received a bill for a Medicare-covered preventive screening, or if your claim was denied, there's a good chance the problem is fixable. This guide covers the most common screening disputes and how to resolve them.

What Preventive Screenings Medicare Covers (At No Cost)

Medicare covers a wide range of preventive services under Part B, typically with no copay and no deductible when provided by a Medicare-enrolled provider who accepts Medicare assignment:

Cancer screenings:

• Colorectal cancer screening: Fecal occult blood tests annually; flexible sigmoidoscopy every 4 years; colonoscopy every 10 years (or every 2 years for high-risk individuals); cologuard (stool DNA test) every 3 years for average-risk patients 45–75
• Mammogram (breast cancer screening): Annual screening mammogram for women 40 and older
• Pap smear and pelvic exam (cervical and vaginal cancer): Every 24 months, or every 12 months for high-risk women
• PSA test (prostate cancer screening): Annual PSA blood test for men 50 and older
• Lung cancer screening: Annual low-dose CT scan for high-risk current or former smokers (ages 50–77 who smoked at least 30 pack-years)
• Skin cancer prevention counseling: For fair-skinned patients under 24 (limited screening benefit)

Other covered screenings:

• Bone density (DEXA scan) for osteoporosis: Every 24 months (or more frequently if medically necessary)
• Diabetes screening: Up to 2 per year for those at risk
• Blood pressure, cholesterol, obesity, depression, alcohol misuse screening
• HIV screening: Annual for at-risk individuals; once for all Medicare enrollees 15–65
• Hepatitis B and C virus screening
• Cardiovascular disease behavioral therapy

Why Preventive Screening Claims Get Denied or Misbilled

Frequency violation. Medicare covers screenings on a specific schedule. A colonoscopy billed before the 10-year interval has passed (for average-risk patients) may be denied as too soon. However, if you are high-risk — with a family history, prior polyps, or other risk factors — the screening interval may be shorter, and your physician can document the clinical rationale.

Screening became diagnostic. This is the most common and most frustrating billing problem for colonoscopies in particular. If you scheduled a screening colonoscopy and the doctor found and removed a polyp during the procedure, some billing systems automatically reclassify it as a diagnostic or therapeutic procedure — removing the zero-cost-sharing protection and generating a bill.

Medicare has attempted to address this: as of 2023, even if a polyp is found and removed during a scheduled screening colonoscopy, the cost-sharing is phased in rather than being at full diagnostic rates. But billing errors still happen. If your colonoscopy became more expensive because a polyp was found, check whether the procedure was re-coded incorrectly.

Provider used the wrong billing code. Preventive services have specific billing codes. If your doctor's office billed using a standard office visit or diagnostic code instead of the prevention code, Medicare may apply cost-sharing rather than covering it fully.

Provider doesn't accept Medicare assignment. If you see a provider who doesn't accept Medicare assignment, they can charge above the Medicare-approved amount. The preventive coverage rules still apply, but you may owe the excess charge.

Screening done as part of a medical visit. If your provider billed the screening alongside treatment for a medical condition at the same visit, the preventive portion may have been bundled into the medical visit billing incorrectly.

How to Appeal or Dispute a Preventive Screening Denial

Step 1: Review your Medicare Summary Notice or EOB)" class="auto-link">Explanation of Benefits. Look at the billing code used. Compare it to what Medicare covers under the preventive benefit. If the code doesn't match the preventive benefit, that's your starting point.

Step 2: Contact the provider's billing department. Ask them to review and correct the billing code if the service was a preventive screening. A corrected claim with the right code submitted by your provider often resolves the issue without a formal appeal.

Step 3: Call Medicare. If the provider won't cooperate or the issue is more complex, call 1-800-MEDICARE. Explain the situation. Medicare representatives can investigate billing issues and escalate if appropriate.

Step 4: File a formal Redetermination. If you've received a formal denial, file a Redetermination with the Medicare Administrative Contractor within 120 days. Include your Explanation of Benefits or Medicare Summary Notice, documentation from your provider about the nature of the service, and a written explanation of why the screening should be covered at no cost.

Special Issue: Colonoscopy Polyp Removal Cost-Sharing

The cost-sharing situation when a polyp is found and removed during a screening colonoscopy has been a source of significant confusion and expense for seniors for years. Here's the current rule:

If a polyp is found and removed during your screening colonoscopy, Medicare does not eliminate your cost-sharing entirely — but it caps it at a percentage (25% in 2023, phasing to 0% by 2030 under current law). If you were charged the full diagnostic rate rather than the reduced preventive rate, your claim may have been processed incorrectly.

Getting Help

SHIP counselors (your State Health Insurance Assistance Program) can review your Medicare Summary Notice and help you identify billing errors at no cost. Find your local SHIP by calling 1-800-MEDICARE.

Fight Back With ClaimBack

Preventive screening billing errors are common and correctable. ClaimBack helps you identify whether your denial or unexpected bill is based on a billing error or an incorrect coverage determination — and generates the documentation you need to dispute it effectively.

Start your appeal at ClaimBack

Related Reading

• Medicare Annual Wellness Visit Denied or Billed Wrong — How to Fix It
• How to Write an Insurance Appeal Letter
• Common Reasons Insurance Claims Are Denied