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Dr. Karthik Gunachelvan, MD

Dr. Karthik Gunachelvan, MD

Internist
1500 Boston Post Rd, Ste 100, Darien, CT
5.00
“Dr. G was tremendous in our first appointment. He greeted me with energy, understanding, patience, and kindness while providing me with my next steps for care. I’ve never left the doctors feeling more taken care of.”
Andrew D.March 7, 2026
Highly recommended
100% of patients gave this doctor 5 stars
Excellent wait time
100% of patients waited less than 30 minutes
New patient appointments
Appointments available for new patients on Zocdoc

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Scheduling details

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Today, Apr 3 – Thu, Apr 16
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What patients are saying

Overall rating

5.00

Average wait time

5.00

Bedside manner

5.00
“Dr. G was tremendous in our first appointment. He greeted me with energy, understanding, patience, and kindness while providing me with my next steps for care. I’ve never left the doctors feeling more taken care of.”
Andrew D.March 7, 2026

About Dr. Karthik Gunachelvan

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.

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Areas of expertise

This doctor's experience enhances their expertise in similar cases. Below are the conditions or surgeries they treat most frequently.
Coronary Artery Disease
Chronic high blood pressure
Heart failure
High cholesterol
Underactive thyroid
Emphysema (COPD)
Coronary Artery Disease
Chronic high blood pressure
Heart failure
High cholesterol

Office location

SHMG - Primary Care - Darien
1500 Boston Post Rd, Ste 100, Darien, CT 06820
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Education and background

Practice names

Board certifications

  • American Board of Internal Medicine

Education and training

  • Medical School - American Canadian School of Medicine - ACSOM, Doctor of Medicine
  • One Brooklyn Health-Brookdale University Hospital Medical Center, Residency in Internal Medicine

Professional memberships

  • American College of Physicians
  • Massachusetts Medical Society

Languages spoken

  • English
  • Tamil

Provider's gender

Male

NPI number

1740604941

Patient reviews

All reviews have been submitted by patients after interacting with the practice.
Overall rating
5.00
Wait time
5.00
Bedside manner
5.00
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2 reviews
Most relevant
Dr. G was tremendous in our first appointment. He greeted me with energy, understanding, patience, and kindness while providing me with my next steps for care. I’ve never left the doctors feeling more taken care of.
Verified patient
Frequently asked questions

How soon can I make an appointment with Dr. Karthik Gunachelvan?

Generally, Dr. Karthik Gunachelvan has appointments available on Zocdoc within 1 week. You can see Dr. Gunachelvan's earliest availability on Zocdoc and make an appointment online.

Is Dr. Karthik Gunachelvan accepting new patients?

Dr. Karthik Gunachelvan generally accepts new patients on Zocdoc. You can see Dr. Gunachelvan's earliest availability on Zocdoc and schedule an appointment online.

Does Dr. Karthik Gunachelvan accept my insurance?

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Can I make an appointment with Dr. Karthik Gunachelvan online?

Yes, you can make an appointment online with Dr. Gunachelvan using Zocdoc. It’s simple, secure, and free.

What practice does Dr. Karthik Gunachelvan work with?

Where is Dr. Karthik Gunachelvan's office located?

Dr. Karthik Gunachelvan's office is located at 1500 Boston Post Rd, Darien, CT 06820.

Which board certifications does Dr. Karthik Gunachelvan have?

Dr. Karthik Gunachelvan is certified by American Board of Internal Medicine.

What are common reasons for patients to see Dr. Karthik Gunachelvan?

Dr. Karthik Gunachelvan frequently sees patients for Annual Physical, Anxiety, General Consultation, Illness, and New Patient Visit. You can see other visit reasons for Dr. Karthik Gunachelvan on their profile.

What languages does Dr. Karthik Gunachelvan speak?

Dr. Karthik Gunachelvan speaks English and Tamil.

How do patients rate Dr. Karthik Gunachelvan in reviews?

2 patients have reviewed Dr. Karthik Gunachelvan. The overall rating for this doctor is 5/5. They have a 5/5 rating for bedside manner and a 5/5 rating for wait time. You can read individual reviews and ratings on their profile.

Zocdoc›Stamford, CT Internists›Dr. Karthik Gunachelvan, MD