Andrew Tzellas, M.D
NPI 1003996042 · Internal Medicine Physician · Napa, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Andrew Tzellas, M.D is a Internal Medicine Physician provider in Napa, CA (NPI 1003996042).
Provider details
- NPI number
- 1003996042
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D
- Sex
- Male
- Sole proprietor
- Yes
- License
- 236059 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 225 | 84 |
| Amlodipine Besylate | 123 | 44 |
| Lisinopril | 91 | 29 |
| Losartan Potassium | 66 | 30 |
| Omeprazole | 63 | 25 |
| Metformin Hcl | 61 | 26 |
| Sertraline Hcl |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-16
- Last updated
- 2023-11-27
- Certified
- 2023-11-10
Frequently asked questions
- What is Andrew Tzellas's NPI number?
- Andrew Tzellas's National Provider Identifier (NPI) is 1003996042, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Andrew Tzellas's specialty?
- Andrew Tzellas is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Andrew Tzellas located?
- Andrew Tzellas's practice location on file with NPPES is 1141 Pear Tree Ln Ste 100, Napa, CA 94558-6485.
- What is Andrew Tzellas's phone number?
- The practice phone number listed in the NPPES registry for Andrew Tzellas is (707) 254-1770.
- Does Andrew Tzellas accept Medicare?
- Andrew Tzellas is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Andrew Tzellas's NPI active?
- Yes — Andrew Tzellas's NPI (1003996042) is active in the NPPES registry as of the last update on 2023-11-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.