Antonios Katsigiannis, M.D.
NPI 1629157276 · Internal Medicine Physician · Stamford, CT
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Antonios Katsigiannis, M.D. is a Internal Medicine Physician provider in Stamford, CT (NPI 1629157276).
Provider details
- NPI number
- 1629157276
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 035140 (CT)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
296 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 179 | $133 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 33 | $94 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 27 | $15 |
| Electrocardiogram (ecg) 1 to 3 Leads With Review By Physician93040 | 27 | $14 |
| Advance Care Planning, First 30 Minutes99497 | 16 | $85 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 84 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Rosuvastatin Calcium | 246 | 57 |
| Amlodipine Besylate | 150 | 36 |
| Atorvastatin Calcium | 137 | 38 |
| Levothyroxine Sodium | 120 | 25 |
| Alprazolam | 108 | 24 |
| Pantoprazole Sodium | 104 | 22 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,281 across 120 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-03
- Last updated
- 2019-10-21
Frequently asked questions
- What is Antonios Katsigiannis's NPI number?
- Antonios Katsigiannis's National Provider Identifier (NPI) is 1629157276, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Antonios Katsigiannis's specialty?
- Antonios Katsigiannis is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Antonios Katsigiannis located?
- Antonios Katsigiannis's practice location on file with NPPES is 90 Morgan St, Stamford, CT 06905-5466.
- What is Antonios Katsigiannis's phone number?
- The practice phone number listed in the NPPES registry for Antonios Katsigiannis is (203) 323-8437.
- Does Antonios Katsigiannis accept Medicare?
- Antonios Katsigiannis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Antonios Katsigiannis's NPI active?
- Yes — Antonios Katsigiannis's NPI (1629157276) is active in the NPPES registry as of the last update on 2019-10-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.