Lung cancer can feel scary because it often starts quietly. Some people have no symptoms early on, while others notice a cough, shortness of breath, chest pain, or repeated lung infections and assume it is “just aging,” bronchitis, or smoking history catching up with them.
The most important point is this: lung cancer is easier to treat when it is found earlier. Medicare may help with screening for people at higher risk, diagnostic testing when something looks concerning, and many treatment services if lung cancer is diagnosed.^1
In this article
Symptoms
Prevention
Diagnosis
Treatment
Recovery
Medications
Common Questions
What Is Lung Cancer?
Lung cancer starts when abnormal cells in the lung grow out of control. These cells may form a tumor, spread within the lung, or move to lymph nodes, bones, the brain, liver, adrenal glands, or other parts of the body.
The two main types are non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC). Non-small cell lung cancer is more common. Small cell lung cancer is less common, often grows faster, and is strongly linked with smoking.
Smoking is the leading risk factor, but lung cancer is not only a smoker’s disease. People who never smoked can also develop lung cancer. Other risk factors include secondhand smoke, radon, asbestos, diesel exhaust, air pollution, prior chest radiation, family history, and certain workplace exposures.^2
Common Signs and Symptoms
Lung cancer symptoms can be easy to miss. Possible warning signs include:
A cough that does not go away or gets worse
Coughing up blood or rust-colored mucus
Chest pain
Shortness of breath
Wheezing
Hoarseness
Repeated bronchitis or pneumonia
Unexplained weight loss
Loss of appetite
Fatigue
Bone pain or headaches if cancer has spread
Why Lung Cancer Matters
Lung cancer is one of the most common cancers in the United States and remains the leading cause of cancer death. The American Cancer Society estimates about 229,410 new lung cancer cases in the United States in 2026.^3
That is why screening matters for people who qualify. Screening is different from testing symptoms. Screening looks for cancer before symptoms appear. If symptoms are already present, the next step is usually diagnostic evaluation, not preventive screening.
Causes and Risk Factors
Lung cancer starts when cells in the lung change and grow out of control. Over time, these abnormal cells can form a tumor and may spread to lymph nodes or other parts of the body.
Smoking is the leading risk factor for lung cancer, but it is not the only one. People who never smoked can also develop lung cancer.
Common risk factors include:
Cigarette smoking
Secondhand smoke
Radon exposure
Asbestos exposure
Diesel exhaust
Air pollution
Certain workplace chemicals or dusts
Prior radiation therapy to the chest
Family history of lung cancer
Older age
Medicare Coverage for Lung Cancer Screening
Medicare Part B covers annual lung cancer screening with low-dose computed tomography (LDCT) when specific rules are met.^1
To qualify under Medicare’s national coverage determination, a person generally must:
Be age 50 through 77
Have no signs or symptoms of lung cancer
Have a tobacco smoking history of at least 20 pack-years
Be a current smoker or have quit within the past 15 years
Receive an order for the screening
A pack-year means smoking an average of one pack per day for one year. For example, one pack a day for 20 years equals 20 pack-years.
Before the first screening, Medicare also requires a counseling and shared decision-making visit. This visit helps review eligibility, benefits, risks, possible false alarms, follow-up testing, radiation exposure, and smoking cessation support.^4
A screening LDCT is not the same as a diagnostic CT scan. If the scan finds something suspicious, follow-up testing may be billed differently.
CMS National and Local Determinations
Medicare has a national coverage determination for lung cancer screening with low-dose computed tomography. This is National Coverage Determination 210.14, which sets the Medicare screening rules above.^4
Some lung cancer-related services may also be affected by local coverage determinations (LCDs). These are coverage rules used by Medicare Administrative Contractors in certain regions. Local determinations may apply to services such as biomarker testing, molecular diagnostic testing, predictive classifiers for early-stage non-small cell lung cancer, and certain radiation therapy services.^5
This matters because lung cancer care can include highly specific tests and treatments. If a provider recommends biomarker testing, advanced imaging, radiation therapy, or a newer test, ask whether Medicare coverage depends on a national rule, a local rule, medical necessity documentation, or prior authorization under a Medicare Advantage plan.
The biggest prevention step is to avoid smoking or quit smoking. It is also wise to avoid secondhand smoke, test the home for radon, reduce workplace exposures.
Diagnosis
If symptoms appear or a screening test shows something concerning, a doctor may order more testing. This may include a chest X-ray, diagnostic computed tomography (CT) scan, positron emission tomography (PET) scan, magnetic resonance imaging (MRI), bronchoscopy, biopsy, lab work, pathology, staging tests, and biomarker testing.
Medicare Part B generally helps cover medically necessary outpatient doctor visits, specialist visits, diagnostic imaging, lab work, pathology, and many outpatient procedures. If the person is admitted to the hospital, Medicare Part A may apply.
The key Medicare question is whether the service is screening, diagnostic, outpatient treatment, inpatient care, or a prescription drug. That difference can affect costs.
Treatment
Lung cancer treatment depends on the type of lung cancer, the stage, test results, overall health, lung function, and the person’s goals for care. The two main types are non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC), and they are often treated differently.
Treatment may involve one main approach or a combination of several treatments. Common options include surgery, radiation therapy, chemotherapy, immunotherapy, targeted therapy, palliative care, and hospice care when appropriate.^1
Surgery - Surgery may be an option when lung cancer is found earlier and has not spread too far. The goal is to remove the cancer and, in many cases, nearby lymph nodes to check whether cancer has spread.
Radiation Therapy - Radiation therapy uses high-energy beams to damage or destroy cancer cells. It may be used when surgery is not the best option, after surgery to lower the chance of cancer returning, with chemotherapy, or to help relieve symptoms.
Chemotherapy - Chemotherapy uses medicine to kill cancer cells or slow their growth. It may be used before surgery, after surgery, with radiation, or when lung cancer has spread.
Immunotherapy - Immunotherapy helps the immune system recognize and attack cancer cells. It has become an important treatment option for many people with advanced non-small cell lung cancer and some people with small cell lung cancer.
Targeted Therapy - Targeted therapy is treatment aimed at specific changes in cancer cells. These treatments are more common for certain types of non-small cell lung cancer.
Palliative Care - Palliative care focuses on comfort, symptom relief, and quality of life. It can help with pain, breathing trouble, fatigue, anxiety, nausea, appetite changes, and the stress of living with cancer.
Palliative care is not the same as hospice. A person may receive palliative care while still receiving active cancer treatment.
Hospice Care - Hospice may be appropriate when lung cancer is advanced and the focus shifts from trying to cure or control the cancer to comfort-focused care.
Lung cancer treatment may include surgery, radiation therapy, chemotherapy, immunotherapy, targeted therapy, supportive care, or hospice.
Lung Cancer Treatment and Medicare
Surgery
Medicare may help cover lung cancer surgery when it is medically necessary. Medicare Part A may apply if the surgery requires an inpatient hospital stay. Medicare Part B may apply to surgeon services, anesthesia, outpatient procedures, follow-up visits, and related outpatient care.
Radiation Therapy
Medicare may cover radiation therapy in inpatient or outpatient settings when it is medically necessary. The part of Medicare that applies depends on where the treatment is received.
Chemotherapy
Medicare Part B may cover many chemotherapy drugs given through an IV or injection in a doctor’s office, infusion center, or outpatient clinic. Some oral chemotherapy drugs may also fall under Part B. Other oral cancer medicines may be covered under Medicare Part D instead.
Immunotherapy
Medicare coverage depends on the drug and setting. If immunotherapy is given in an outpatient medical setting, Medicare Part B may apply. If a medication is self-administered at home, Medicare Part D may apply.
Targeted Therapy
Many targeted therapy drugs are pills taken at home. That means they may be covered under Medicare Part D, depending on the plan’s formulary, prior authorization rules, tier, and pharmacy network.
Palliative Care
Medicare may cover many medically necessary palliative services, such as doctor visits, symptom management, medications, durable medical equipment, home health services when criteria are met, and other supportive care.
Hospice Care
Medicare Part A may cover hospice care when a doctor certifies that the person has a terminal illness with a life expectancy of six months or less if the illness runs its usual course, and the person chooses hospice care.
Hospice can include care from doctors, nurses, aides, social workers, chaplains, medications for symptom relief, medical equipment, and support for the family.
With lung cancer, one treatment plan may involve Part A, Part B, and Part D. It is wise to ask the oncology team which part of Medicare is expected to cover each service or medication.
Recovery, Follow-Up, and Supportive Care
After treatment, follow-up may include imaging, lab work, office visits, symptom management, pulmonary support, nutrition support, smoking cessation support, home health care, skilled nursing facility care, durable medical equipment, palliative care, or hospice.
Palliative care is not the same as hospice. Palliative care can be used alongside treatment to help with pain, breathing, fatigue, anxiety, nausea, and quality of life.
Hospice may be covered under Medicare Part A when a doctor certifies that a person has a terminal illness with a life expectancy of six months or less if the disease runs its usual course, and the person chooses comfort-focused care.
Drug Coverage
Lung cancer treatment may include chemotherapy, immunotherapy, targeted therapy, pain medicine, nausea medicine, antibiotics, inhalers, or other supportive medications. Medicare coverage depends on the drug, how it is given, and where it is received.
Medicare Part B may cover many cancer drugs given in a doctor’s office, infusion center, or outpatient hospital setting. This can include many chemotherapy, immunotherapy, and injectable or infused medications when they are medically necessary.^2
Medicare Part D may cover many self-administered outpatient prescription drugs. This may include some oral cancer drugs, nausea medications, pain medications, antibiotics, inhalers, and other medicines used during treatment.^3
This is where people can get surprised. One lung cancer treatment plan may include:
A Part B-covered infusion drug
A Part D-covered oral medication
Supportive drugs with different copays
Prior authorization requirements
Specialty-tier cost sharing
Pharmacy network rules
Step therapy or formulary restrictions
If a drug is not covered or has restrictions, the patient or prescriber may be able to request a coverage determination or exception from the plan.^4
Medicare Part D may cover many self-administered outpatient prescription drugs, including some oral cancer medicines, nausea medicines, pain medicines, antibiotics, inhalers, and other medications.
What Medicare Usually Does Not Cover
Original Medicare usually does not cover routine home radon mitigation, transportation to appointments, lodging near a cancer center, long-term custodial care, most over-the-counter supplements, or non-covered alternative treatments.
Some Medicare Advantage plans may offer extra benefits, but these vary by plan.
Medicare Advantage Considerations
Medicare Advantage plans must cover Medicare-covered services, but plan rules can be very important during cancer care.
Before treatment begins, confirm the oncologist, surgeon, hospital, imaging center, radiation center, infusion center, pharmacy, and preferred cancer center are in network. Also ask about referrals, prior authorization, drug coverage, and out-of-pocket maximums.
Network access can matter a lot in cancer care. A trusted specialist or cancer center may not be in every plan’s network.
Common Questions
What is the 5 finger test for lung cancer?
The “5 finger test” usually refers to a home check for finger clubbing, sometimes called the Schamroth window test. A person places matching fingernails together and looks for a small diamond-shaped space between the nails. If that space is missing, it may suggest finger clubbing.
This is not a lung cancer test and cannot diagnose cancer. Finger clubbing can happen with lung cancer, but it can also happen with other lung, heart, liver, or digestive conditions. If someone notices nail changes, shortness of breath, cough, weight loss, or coughing blood, they should contact a healthcare provider.^7
What is the 2 week rule for lung cancer?
The “2 week rule” can mean two different things.
In the United Kingdom, it often refers to an urgent suspected cancer referral pathway, where people with concerning symptoms may be referred quickly for specialist evaluation.^8
In everyday health education, some groups use a simpler rule: if a new or unusual symptom lasts two weeks or more, get it checked. For lung cancer, that could include a lingering cough, shortness of breath, chest discomfort, unexplained fatigue, or weight loss.
This is not a Medicare rule. But it is a useful reminder: do not ignore symptoms that persist or worsen.
What to Do Next
If lung cancer is a concern, the next step depends on whether the person has symptoms or is asking about screening.
If there are symptoms, such as coughing up blood, chest pain, shortness of breath, unexplained weight loss, or a cough that will not go away, contact a healthcare provider. Symptoms should not be treated as routine aging or “just a smoker’s cough.”
If there are no symptoms but there is a smoking history, ask the doctor whether Medicare-covered lung cancer screening with low-dose computed tomography applies. The doctor can review age, pack-year history, quit date, overall health, and whether screening makes sense.
The most practical step is to clarify coverage before care begins when possible. Lung cancer care can move quickly, and knowing the plan rules early can help avoid confusion later.
Learn more about Medicare
Key Takeaways
Lung cancer can start quietly, which is why screening matters for people at higher risk.
Medicare Part B may cover annual low-dose CT screening for eligible people ages 50 through 77 with enough smoking history and no symptoms.
Screening and diagnostic testing are not the same. Follow-up testing after an abnormal scan may have different costs.
Treatment may involve several parts of Medicare, including Part A, Part B, and Part D.
Medicare Advantage plan rules matter. Networks, referrals, prior authorization, and drug formularies can affect access and cost.
References
This website is for educational purposes only. It isn’t medical advice, legal advice, or financial advice. It also isn’t a promise of coverage or payment. For official Medicare information, visit Medicare.gov. You can also get free, unbiased help from your State Health Insurance Assistance Program (SHIP). For personal medical guidance, talk with your doctor, and review your Medicare plan documents.