Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Karthik Gunachelvan

Individual provider Internal Medicine Physician · NPI 1740604941

Dr. Karthik Gunachelvan is an Internal Medicine in Darien, Connecticut. Qualified in 2013, 13 years ago. Practices with Stamford Health Medical Group Inc, a 432-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Connecticut.

Years since qualifying
13
Licensed in
CT
In the registry since
2014
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Practice location Address checks out

1500 Post Rd Ste 100
Darien, CT 06820-5936
Phone: (203) 655-8749
Fax: (203) 656-0701
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 82825 (CT)

Record details

NPI number1740604941
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorYes
NPI enumeratedFebruary 7, 2014
Last updated in NPPESOctober 21, 2025
Certification dateOctober 21, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2013 (13 years in practice)
Group practice Stamford Health Medical Group Inc — 432 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Other providers in Darien