LDCT eligibility · Cancer screening
Do I Qualify for Lung Cancer Screening?
Lung cancer screening with low-dose CT is for specific smokers and recent quitters. Check the eligibility rules, pack-year math, and what comes next.
Annual low-dose CT lung cancer screening is for adults ages 50 to 80 who have smoked at least 20 pack-years and currently smoke or quit within the past 15 years. You also need a shared decision-making visit with a clinician before starting.
The eligibility checklist
To qualify for lung cancer screening, all three conditions generally apply: age 50 to 80, at least 20 pack-years of smoking, and current smoking or having quit within the last 15 years. If you quit more than 15 years ago, routine screening is no longer recommended.
A pack-year is calculated by multiplying the number of packs smoked per day by the number of years. For example, one pack a day for 20 years equals 20 pack-years, and two packs a day for 10 years also equals 20 pack-years.
- Age 50 to 80.
- 20 or more pack-years.
- Current smoker or quit within 15 years.
Why shared decision-making matters
Lung screening is not a simple yes-or-no test. It has real benefits, including a lower chance of dying from lung cancer in eligible high-risk groups. It also has downsides, such as false positives, follow-up scans, biopsies, and the anxiety that comes with incidental findings.
A shared decision-making visit lets you weigh those trade-offs with a clinician. It is also required for Medicare and many insurers to cover the screening without cost sharing when other conditions are met.
What screening does and does not mean
Screening can find lung cancer earlier than waiting for symptoms, but it does not prevent all lung cancer deaths. A normal scan is reassuring, yet it does not rule out future disease. Screening is also not a substitute for quitting smoking.
If you currently smoke, the most impactful single step you can take is still to quit. Screening is an add-on, not a replacement for stopping tobacco use.
Next steps if you qualify or do not qualify
If you qualify, ask your primary care clinician or pulmonologist for a referral to a lung screening program. Verify that the facility and radiologist are in your network and that the visit is coded as preventive screening if you expect no cost sharing.
If you do not qualify because you quit more than 15 years ago or never reached 20 pack-years, routine LDCT screening is not recommended. Report symptoms such as coughing up blood, persistent chest pain, or unexplained weight loss promptly instead.
- Ask: 'Do I meet the pack-year and quit-date criteria for lung CT screening?'
- Ask: 'Is this facility in network for preventive lung screening under my plan?'
Sources and review status
Sources checked July 20, 2026. Independent clinician review is pending.
Turn reading into a useful next step
Calculate my pack-years
Calculate my pack-years →Frequently asked questions
How many pack-years do I need for lung cancer screening?
You need at least 20 pack-years. That could be one pack per day for 20 years, two packs per day for 10 years, or another combination that reaches the same total.
Is lung cancer screening covered by insurance?
Medicare currently covers eligible adults ages 50 to 77 once per year with no payment when the provider accepts assignment; private-plan rules can differ. Verify the age limit, order, provider, and cost-sharing rules that apply to you.
What if I quit smoking 20 years ago?
If you quit more than 15 years ago, routine screening is generally not recommended, even if you previously had a heavy smoking history. Talk to your clinician if you develop symptoms.
Sources
Sources checked July 20, 2026. Independent clinician review is pending. Educational only; not a diagnosis, medical advice, coverage determination, or substitute for symptom evaluation.