Mary Callsen, MD in Baltimore: Internal Medicine with Direct-Pay and Concierge Options

Mary Callsen, MD, operates as an internal medicine physician in Baltimore offering both traditional insurance-based care and concierge medicine, a model that combines comprehensive primary care with more frequent access and longer appointments than most standard practices. Her practice bridges two patient pathways: those using conventional insurance coverage and those paying an annual membership fee for priority scheduling and same-day or next-day availability.

What internal medicine with Dr. Callsen actually involves

Callsen practices full-scope internal medicine, meaning she manages chronic conditions (hypertension, diabetes, heart disease, thyroid disorders), handles acute illness, coordinates specialist referrals, and performs preventive care and screening. The concierge component—available to interested patients—replaces the high-volume model with a smaller panel size, guaranteeing shorter wait times and the ability to spend 30 to 45 minutes per appointment rather than the 15 to 20 minutes typical in standard practices.

The practice sits between two models common in Baltimore. Traditional insurance-based internal medicine—still offered—integrates with the major health systems and follows standard appointment scheduling. The concierge tier serves patients who prioritize access and sustained continuity over out-of-pocket predictability.

Services and membership pricing

Standard internal medicine visits through insurance cost what your plan covers; patient responsibility depends on copays, deductibles, and coinsurance. These appointments follow typical scheduling: one to two weeks out in many Baltimore practices.

The concierge membership (often called "retainer" or "membership" medicine in Baltimore) typically ranges from $1,500 to $3,000 annually, though the exact fee for Callsen's practice should be confirmed directly. This covers the physician's services, with imaging, labs, and specialist referrals typically billed separately to insurance or out of pocket. The membership model pays forward through reduced wait times and email or phone access for non-urgent questions. Verify current membership fees and what services fall inside vs. outside the annual payment.

How Callsen compares to other Baltimore internal medicine options

Most Baltimore internists in large health systems (University of Maryland Medical Center, Johns Hopkins, MedStar) operate on insurance alone with high patient panels. Getting a first appointment often takes four to six weeks; urgent same-day slots are limited. These practices offer system resources and specialist networks but little continuity beyond the chart.

A smaller number of Baltimore physicians—including some affiliated with independent practices—offer concierge or hybrid models. Callsen's approach stands out because she accepts both insurance patients and membership patients, not one or the other exclusively. Patients without interest in or ability to afford a membership fee can still establish care using standard insurance, an option not all concierge-only practices provide.

Choose standard insurance-based care if you have good coverage and are comfortable with longer waits or brief visits. Choose the membership tier if you value rapid access, extended consultation time, and the ability to reach your physician between appointments.

Who suits this practice and who does not

Callsen works well for patients with complex or multiple chronic conditions who benefit from longer appointments and hands-on coordination (particularly the concierge members). Stable, established patients seeing a primary care physician once yearly for checkups fit standard care. Patients with limited or no insurance face out-of-pocket costs either way; membership may be prohibitive.

This practice does not operate a walk-in clinic, does not handle acute injuries or fractures, and does not replace urgent care. For same-day acute illness without a membership, urgent care remains more accessible.

What a first visit involves

New patients start with a comprehensive history and physical, typically 45 to 60 minutes, including a review of past medical history, medication list, family history, lifestyle, and baseline vital signs. Initial labs (blood work, urinalysis) are usually ordered to establish a baseline. Concierge members may complete intake by email before arrival; insurance patients complete standard new-patient paperwork in the office.

Hours, location, and logistics

Confirm current office hours and the specific Baltimore location with the practice directly, as these details change. Parking varies by location; ask when scheduling whether lot parking or street parking is standard. Insurance accepted similarly should be verified at the time of inquiry, as networks change.

Callsen offers a model that Baltimore patients tired of rushed primary care appointments and those seeking concierge convenience can access on the same terms, filling a practical gap between the high-volume health system standard and the full-concierge-only boutique practices elsewhere in the city.