Quick answers
- Does Karthik Gunachelvan accept Medicare assignment?
- Yes. Medicare's clinician data says Karthik Gunachelvan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Karthik Gunachelvan see?
- In 2024, CMS data shows 461 Original Medicare patients and 1,754 services for Karthik Gunachelvan. This counts Original Medicare only and measures volume, not quality.
- What is Karthik Gunachelvan's NPI number?
- 1740604941. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Karthik Gunachelvan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 461 |
|---|---|
| Services billed to Medicare | 1,754 |
| Different services or procedures | 29 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)813 services
- Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional (99211)219 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)169 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)105 services
- Administration of influenza virus vaccine (G0008)66 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis40%
- Diabetes39%
- Chronic kidney disease34%
- Ischemic heart disease27%
Hospitals where Karthik Gunachelvan works
Medicare's Facility Affiliation Data lists Karthik Gunachelvan at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Baystate Medical CenterSpringfield, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220077
- Mercy Medical CenterSpringfield, MA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 220066
- Stamford HospitalStamford, CT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 070006
Practice locations
Addresses where Karthik Gunachelvan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1500 Post RdDarien, CT 06820 (203) 276‑4282
- 305 Bicentennial HwySpringfield, MA 01118 (413) 733‑4101
Group practices
Medicare enrollment lists Karthik Gunachelvan as a member of these groups (CMS data updated October 2, 2026).
- Stamford Health Medical Group Inc444 clinicians in the group
- Riverbend Medical Group Inc226 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Darien
Clinicians with the same Medicare primary specialty in Darien, CT — not a recommendation.
Other clinicians in Stamford Health Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2013 (13 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1740604941 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians