If you have Original Medicare and see a primary care doctor regularly, there's a good chance you're leaving real benefits on the table — not because Medicare doesn't cover them, but because your doctor may never bill for them. Medicare's fee-for-service system pays physicians only when they submit specific billing codes for specific services. When those codes go unused — whether from time pressure, lack of awareness, or administrative burden — the services simply don't happen. For Medicare beneficiaries, that means missed screenings, uncoordinated care, and out-of-pocket costs that could have been avoided.

The Annual Wellness Visit is perhaps the single most underused benefit in all of Original Medicare. This is not the same as a routine physical exam. The AWV — billed under CPT code G0438 for the first visit and G0439 for subsequent years — is a dedicated Medicare-covered appointment focused entirely on prevention and planning. Your doctor reviews your medical and family history, updates your list of current providers and medications, assesses your cognitive function, screens for depression, checks your blood pressure, and creates or updates a personalized prevention plan. Under Original Medicare, there is no copay and no deductible applied to the AWV itself, as long as your doctor accepts Medicare assignment. Yet according to research published in health policy journals, fewer than 20% of eligible Medicare beneficiaries receive an AWV in any given year. If you haven't had one, you can call your doctor's office and ask specifically for an Annual Wellness Visit — use those exact words.

Chronic Care Management, or CCM, is another benefit that could transform daily life for millions of seniors but remains dramatically underutilized. If you have two or more chronic conditions — think diabetes and heart disease, or COPD and hypertension — Medicare covers at least 20 minutes per month of non-face-to-face care coordination services provided by your doctor's clinical staff. This means a nurse or care coordinator can call you, review your medications, help you schedule specialist appointments, and flag warning signs before they become emergencies. The billing code is CPT 99490, and your cost under Original Medicare is typically 20% of the Medicare-approved amount after your Part B deductible, which in 2025 is $257 for the year. Some Medicare Supplement (Medigap) plans cover that 20% coinsurance entirely, making CCM effectively free. The problem is that many small primary care practices haven't set up the infrastructure to bill for it consistently, so patients who would benefit enormously simply never get enrolled.

Advance Care Planning visits are a Medicare benefit that almost no one knows exists. Under CPT codes 99497 and 99498, Medicare covers a dedicated conversation with your physician or other qualified provider about your wishes for end-of-life care — including completing or reviewing advance directives like a living will or healthcare proxy designation. The first 30 minutes are covered at 100% with no cost-sharing when the ACP visit is provided as part of your Annual Wellness Visit. If it's a standalone visit, standard Part B cost-sharing applies. This is not a morbid conversation to avoid — it's a practical one that can spare your family enormous stress and ensure your wishes are actually followed. You can request this visit by name at any primary care appointment.

Transitional Care Management, billed under CPT codes 99495 and 99496, is designed for the critical window after you're discharged from a hospital, skilled nursing facility, or inpatient rehab. Studies consistently show that the 30 days following a hospitalization are when Medicare beneficiaries are most vulnerable to readmission. TCM requires your primary care doctor to make contact with you within two business days of discharge and see you in the office within 7 or 14 days, depending on the complexity of your medical needs. The service includes medication reconciliation, coordination with specialists, and a follow-up plan. Despite being a well-reimbursed code that directly reduces costly readmissions, many practices don't have systems in place to trigger it automatically after a patient leaves the hospital. If you or a family member is discharged from any facility, call your primary care office the same day and ask them to initiate Transitional Care Management.

Behavioral health integration is a newer category of Medicare billing codes — specifically CPT 99484 and the Collaborative Care Model codes 99492, 99493, and 99494 — that allow primary care practices to bill for ongoing mental health support coordinated within the primary care setting. Depression and anxiety are significantly undertreated in older adults, partly because many seniors don't seek out a separate psychiatrist or therapist. These codes allow a care manager embedded in your primary care practice to provide regular check-ins, track your symptoms using validated screening tools, and consult with a psychiatric specialist on your behalf — all without you having to go to a separate mental health office. Medicare covers these services under Part B, and they can be genuinely life-changing for beneficiaries dealing with depression after a major health event like a stroke, cancer diagnosis, or the loss of a spouse.

Screening for cognitive impairment is covered by Medicare as a standalone service under HCPCS code G0444 for annual depression screening and as part of the Annual Wellness Visit for cognitive assessment. But Medicare also covers a separate, more detailed cognitive assessment under CPT 99483 when a physician suspects a patient may have cognitive decline. This code covers a comprehensive evaluation including a structured clinical interview, functional assessment, review of medications that may affect cognition, and a care plan. The problem is that many primary care doctors feel undertrained in dementia diagnosis and may avoid initiating the conversation. If you or a family member has noticed memory changes, you have every right to ask your doctor specifically for a cognitive assessment — and Medicare will cover it.

Diabetes self-management training (DSMT) is covered by Medicare under HCPCS codes G0108 and G0109 for beneficiaries who have been diagnosed with diabetes. This benefit covers up to 10 hours of initial training and 2 hours of follow-up training per year, provided by a certified diabetes educator. It can be delivered one-on-one or in a group setting. Despite the fact that roughly 30% of Medicare beneficiaries have diabetes, utilization of DSMT is extremely low — studies suggest fewer than 5% of eligible patients ever receive it. The training covers blood sugar monitoring, medication management, nutrition, foot care, and how to recognize and respond to complications. Your doctor must provide a referral, so ask for one directly if you have a diabetes diagnosis and have never attended a formal education program.

Medical nutrition therapy (MNT) is a separate but related benefit, covered under HCPCS codes G0270 and G0271, for beneficiaries with diabetes or kidney disease (not yet on dialysis). This provides access to a registered dietitian for individualized nutrition counseling — three hours in the first year and two hours in subsequent years, with additional hours available if your doctor determines you need them. Like DSMT, MNT requires a physician referral and is dramatically underused. If you have either of these conditions and have never spoken with a registered dietitian through Medicare, ask your doctor for a referral at your next visit.

Data Snapshot: According to CMS.gov data from the Medicare Physician/Supplier Procedure Summary, the Annual Wellness Visit (G0438/G0439) is billed for only a fraction of the more than 67 million Medicare beneficiaries enrolled in the program. CMS data also shows that in 2025, there are more than 4,000 Medicare Advantage plans available nationally — a figure that highlights how much of the industry's attention and marketing dollars flow toward managed care, while Original Medicare's preventive benefits go quietly unclaimed by the beneficiaries who need them most.

Remote Physiologic Monitoring, or RPM, is a growing category of Medicare-covered services billed under CPT codes 99453, 99454, 99457, and 99458. If you have a chronic condition like hypertension, heart failure, or COPD, your doctor can prescribe a connected device — a blood pressure cuff, pulse oximeter, or weight scale — that transmits readings directly to your care team. Medicare covers the device setup, the monthly data transmission, and at least 20 minutes per month of clinical staff time reviewing your data and communicating with you about it. This benefit can catch dangerous changes in your condition before they require an emergency room visit. Ask your cardiologist or primary care doctor whether RPM is appropriate for your situation.

The underlying reason so many of these codes go unused comes down to the economics of primary care. A standard office visit pays a physician a fixed amount regardless of how much time is spent or how many services are discussed. Preventive and care management codes require additional documentation, staff training, and workflow changes that many small practices haven't invested in. As a patient, the most powerful thing you can do is walk into your next appointment with a list. Ask your doctor: Have I had my Annual Wellness Visit this year? Am I eligible for Chronic Care Management? Do I qualify for diabetes education or nutrition therapy? These are not demanding questions — they are your rights as a Medicare beneficiary, and asking them directly is often all it takes to unlock care you've already paid for through your Part B premium, which in 2025 is $185 per month for most beneficiaries.