Karthik Gunachelvan
NPI 1740604941 · Internal Medicine Physician · Darien, CT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karthik Gunachelvan is a Internal Medicine Physician provider in Darien, CT (NPI 1740604941).
Provider details
- NPI number
- 1740604941
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- Yes
- License
- 82825 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,564 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 813 | $129 |
| Office Or Other Outpatient Visit for the Evaluation and Management of Established Patient That May Not Require Presence of Healthcare Professional99211 | 219 | $24 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 169 | $131 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 105 | $92 |
| Administration of Influenza Virus VaccineG0008 | 66 | $33 |
| Physician Or Allowed Practitioner Certification for Medicare-Covered Home Health Services Under a Home Health Plan of Care (patient Not Present), Including Contacts With Home Health Agency and Review of Reports of Patient Status Required By Physicians and |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 115 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 678 | 298 |
| Amlodipine Besylate | 513 | 226 |
| Lisinopril | 371 | 145 |
| Omeprazole | 280 | 126 |
| Gabapentin | 272 | 85 |
| Levothyroxine Sodium | 258 | 108 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-02-07
- Last updated
- 2025-10-21
- Certified
- 2025-10-21
Frequently asked questions
- What is Karthik Gunachelvan's NPI number?
- Karthik Gunachelvan's National Provider Identifier (NPI) is 1740604941, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karthik Gunachelvan's specialty?
- Karthik Gunachelvan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Karthik Gunachelvan located?
- Karthik Gunachelvan's practice location on file with NPPES is 1500 Post Rd Ste 100, Darien, CT 06820-5936.
- What is Karthik Gunachelvan's phone number?
- The practice phone number listed in the NPPES registry for Karthik Gunachelvan is (203) 655-8749.
- Does Karthik Gunachelvan accept Medicare?
- Karthik Gunachelvan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karthik Gunachelvan's NPI active?
- Yes — Karthik Gunachelvan's NPI (1740604941) is active in the NPPES registry as of the last update on 2025-10-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.