Marc Hamburger, MD in Baltimore: Adult Allergy and Immunology with In-Office Allergen Testing

Dr. Marc Hamburger runs a focused allergy practice in Baltimore that handles diagnosis and management of allergic rhinitis, asthma, food allergy, eczema, and urticaria, operating as an independent allergist rather than within a hospital network or large group system.

What the practice actually is

Hamburger holds board certification in allergy and immunology and works as an allergist-immunologist, the specialist credential that requires additional training beyond medical school. The practice is structured around adults; there is no pediatric focus. Patients seeking allergy diagnosis typically come through referral from a primary care physician, though self-referral is accepted. The practice performs skin testing and allergen-specific IgE testing on-site rather than routing lab work to external vendors, which can accelerate diagnosis and allow same-day results in many cases.

Services and in-office testing

Skin prick testing for common inhalant allergens (tree, grass, ragweed, dust mite, pet dander, mold) is performed during the appointment. This method yields results within 15 to 20 minutes and costs less than blood-based IgE testing. The practice also offers intradermal testing for mold allergens when skin prick results are inconclusive. Component-resolved IgE testing is available for patients with specific occupational or food-related allergies where identifying individual protein components changes treatment.

Sublingual immunotherapy (under-the-tongue tablets) for ragweed, timothy grass, and tree allergens is offered as a three-year treatment course. Cost structures vary by insurance coverage; patients should contact the office to confirm pricing, as copays and deductible status differ significantly between plans. Allergy medication management, injectable allergen extracts, and referral for biologic therapy (monoclonal antibody drugs) fall under standard allergy care offered by the practice.

How Hamburger compares to Baltimore allergists

The independent practice model differs from large-group dermatology-based allergy services, which exist in Baltimore but typically allocate limited time to allergy diagnosis. Hamburger's dedicated focus means the appointment is structured around allergy workup rather than competing with skin conditions, wart removal, or cosmetic procedures. Another Baltimore-area board-certified allergist, such as those at University of Maryland Medical System affiliates, may have shorter initial wait times due to scheduling volume but operate within health system infrastructure that requires electronic health record navigation and may involve resident physicians during evaluation. Hamburger's self-contained practice involves only his evaluation; this eliminates a second opinion process but may result in longer scheduling lead times.

Insurance coverage and in-network status differ substantially. Patients should call ahead to confirm whether Hamburger participates with their insurer; Medicare billing and private plan contracts vary. Hospital-affiliated allergists are more likely to hold contracts with multiple large commercial networks due to system-wide agreements.

Who suits this practice, and who does not

Adults with chronic rhinitis, asthma requiring allergen avoidance or immunotherapy, or food allergy who prefer diagnostic testing completed in a single appointment typically benefit from on-site testing capability. Patients whose insurance offers out-of-network benefits or those able to pay out-of-pocket avoid delays waiting for authorization. Patients already established with a primary care physician who can provide a referral will move through scheduling more smoothly.

This practice does not serve pediatric patients. Patients requiring biologic therapy (such as dupilumab or omalizumab) will be referred to a prescribing provider rather than receiving infusions on-site; the practice handles evaluation and management, not infusion suites. Patients seeking allergy services as part of a broader dermatology practice should consider University of Maryland Medical System locations instead.

What a first visit involves

New patients are asked to complete allergy and medical history forms before the appointment, either by mail or online if the practice maintains that system. The visit begins with history focused on symptom onset, seasonal patterns, environmental exposures, and prior reactions. Physical examination assesses nasal mucosa, throat, lungs, and skin. Skin testing is typically performed on the same day if the patient has stopped antihistamines at least three to five days prior. Results are interpreted immediately and discussed with the patient. Treatment recommendations, whether environmental control, medication, or immunotherapy, are outlined; if immunotherapy is appropriate, initiation may occur at the next visit rather than the same day.

Hours, parking, and logistics

The office operates on a standard business schedule; verification of exact hours, holiday closures, and whether same-day appointments are available should be confirmed directly with the practice. Street parking and lot parking availability vary by location within Baltimore; the practice office address should be reviewed to plan arrival time accordingly.

Hamburger's independent status and in-office allergen testing reduce delays common at large practices and allow adults with allergic disease to receive rapid, focused diagnosis in a single visit.