Karthik Gunachelvan, MD

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Stamford Health Medical Group Primary Care

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1500 Post Rd
Ste 100
Darien, CT 06820
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Main: 203.655.8749
Fax: 203.656.0701

About Me

Dr. Karthik Gunachelvan is a board-certified internal medicine physician specializing in preventative medicine and chronic disease management. Over the last decade, he has dedicated his practice to delivering compassionate, evidence-based care to patients across all stages of adulthood. Dr. Gunachelvan believes in a collaborative, whole-person approach to care, focusing not just on treating illness but on preventing it. His practice emphasizes careful listening, care guided by the latest medical research, and clear communication to ensure each patient feels heard, understood, and empowered to make informed decisions.

Over the course of his career, Dr. Gunachelvan has cared for diverse and multicultural populations, supervised advanced practitioners, and helped implement care delivery improvements that enhance patient access and reduce hospital readmissions. He has also been recognized for exceptional patient satisfaction, earning top-tier ratings for communication, continuity of care, and clinical quality. He earned distinction as one of the top 50 providers within his previous practice.

Dr. Gunachelvan completed his internal medicine residency at a level 1 trauma center in Brooklyn, New York, where he gained broad experience in managing complex medical conditions in underserved communities. As a strong advocate for continuous quality improvement, he integrates modern tools — including AI-enhanced documentation systems — to improve workflow efficiency and enhance patient engagement.

Outside of medicine, Dr. Gunachelvan enjoys sports, gardening, cooking, traveling, and stand-up comedy. He often connects with patients through humor and shared interests, helping create a welcoming and comfortable environment during their visits.

  • Specialties

    Specialties

    Internal Medicine

    Special Interests

    Languages

    English
    Tamil

  • Education & Training

    Medical School

    Ross University School of Medicine Dominica

    Residency

    Brookdale Hospital Medical Center

  • Board Certifications & Affiliations

    Board Certifications

    American Board of Internal Medicine - Internal Medicine

    Affiliations

    American College of Physicians
    Massachusetts Medical Society

Patient Reviews & Comments

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All patient satisfaction ratings are submitted by patients who have confirmed email addresses. After their visit, these patients receive a survey within a few days. They complete the survey online, providing feedback on specific aspects of their care. We use this feedback to improve our services and ensure each patient has an exceptional experience. To respect our patients' time, we only send out surveys once every 90 days, regardless of how many times they visit the clinic.

Patient Ratings Not Available

Insurance Accepted

The below is a list of all insurance plans generally accepted by Stamford Health Medical Group. Please be sure to confirm insurance coverage and the provider's participation with your specific plan before scheduling your appointment.

1 Including Medicare; excluding Aetna Premier Network
2 Including Mediblue, CT Health Exchange Plans and a limited number of Empire BCBS plans
3 Including Medicare, Compass and CT Health Exchange Plans; excluding Individual Value Plan
4 Including Medicare
5 Excluding Medicare

Published Work

If You Are in Need of Emergency Care, Call 911.

The majority of the physicians on the Stamford Hospital Medical Staff are not employees or agents of the Hospital. They are independent practitioners who have been granted the privilege of using the Hospital's facilities for the care and treatment of their patients. This includes, but is not limited to, emergency department physicians, anesthesiologists, radiologists, surgeons, cardiologists, obstetricians, pathologists and other consultants who may treat patients.

Insurance listings are subject to change at any time. Please verify insurance plan acceptance when scheduling an appointment with a healthcare provider.

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