Hamsa N. Subramanian, MD

Hamsa N. Subramanian

Contact Information

  • Office 314-872-3104
  • After Hours 314-872-3104
  • Fax 314-994-7105


Main Location

Signature Allergy & Immunology
425 North New Ballas
Suite 203
St. Louis, MO 63141
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Hospital Affiliations

Missouri Baptist Medical Center

Areas of Interest

Allergy-Related Conditions, Treatment for Asthma and Hives, Skin Disorders, Eczema, Contact Dermatitis, Non-Allergic Rhinitis, Acute and Chronic Sinusitis, Recurrent Infections, Primary Immune Deficiencies


Dr. Subramanian is a board-certified allergist and immunologist who treats both children and adults. Her primary focus is educating and counseling patients, especially those with food allergies.

Outside of work, Dr. Subramanian likes to travel, volunteer in the community, and spend time with her family.

Dr. Subramanian accepts all major insurances. For more information, please visit our Insurance page.

  • The CDC recommends that healthcare facilities continue to require masks, regardless of vaccination status. Our practice requires all physicians, staff, and patients to wear masks while in our clinic.
  • To reduce waiting area overcrowding, all shots are by appointment only. Unless they have an appointment, no children under 16 allowed.
  • Existing Patients: Please use the patient portal to request appointments and communicate with the office. Do not use the “Appointment Request” form on this website to communicate with Dr. Subramanian.
  • Mask Policy: Please note that my patients are asked to continue to wear a mask while coming to my office. Even though St. Louis County has lifted the mask mandate in public places, masking is still recommended by public health in certain settings. It is necessary for all to continue to wear a mask in my office to protect you, your family, vulnerable or compromised patients and staff. This policy is being monitored closely and will be readdressed in the future. Thank you.

Related Video


Medical School: Thanjavur Medical College
Residency: Internal Medicine, St. Mary's Hospital
Fellowship: Allergy and Immunology, Washington University

Certifications & Organizations

American Board of Internal Medicine
American Board of Allergy and Immunology

  • Video Transcript

    Hi, I'm Dr. Hamsa Subramanian. I'm a board certified allergist in Signature Medical Group. I love being an allergist. My patients are great; it's always exciting to see new cases. There's always some challenge.

    St. Louis is very unique because we are situated between the Missouri and the Mississippi. There's a lot of mold, there's a lot of humidity and we have good, clear four seasons which brings in our four, good seasonal allergies as well.

    There are excellent medications: safe preventive medications that you can take and still be a wonderful outdoor person so you can enjoy your walks, your hikes, your running outside, and all your activities without having to stop them.

    One of the key aspects of treating a patient is education. There are medications, we can always write a prescription, you can always take them, but remember: education is as important as taking a medication. Understanding what you have; getting a good feel for what you have from a person who is trained is a part of your treatment and I think focusing on education equally as I focus on medication is very important in my approach to a patient.

Oral Immunotherapy for Peanut Allergy

After a long wait, the FDA has approved oral immunotherapy for peanut allergies. This treatment is approved for children ages four and above, and needs to be started before your child heads off to college by age 17 or 18. This is not by any means a cure for food allergies, but intended to reduce the reactivity when exposed to the deadly allergen.

There are some exceptions, but the majority of the patients qualify for this treatment. It is time-consuming during the dose escalation (otherwise called the updosing phase), but it is worth it for a good quality of life as your child feels comfortable in social settings and you feel comfortable when the child leaves the protection of your home. I am happy to discuss this exciting treatment with families that are concerned about their child being allergic to peanuts. Make an appointment today; the entire family can participate via virtual telehealth appointment for the initial discussion. – Dr. S.