Andrew Tzellas, M.D
Internal Medicine Physician · Napa, CA
Andrew Tzellas, M.D is an internal medicine physician with a practice address in Napa, California, and NPI 1003996042, issued on Oct 16, 2006. Check the license (California C183605, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrew Tzellas
- Credential
- M.D
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- C183605 CA
052165 CT
236059 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1141 Pear Tree LN Ste 100, Napa, CA 94558
- Phone
- (707) 254-1770
- Enumerated
- Oct 16, 2006
- Record last updated
- Nov 27, 2023
- Medicaid ID
- 008045654 CT
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1141 Pear Tree LN Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maria AcevesRegistered Nurse1871042572
- Kendra Brouse, RNRegistered Nurse1437895158
- Michele CarlsonRegistered Nurse1043967680
- Jose Carrasco Sandoval, DDSDentist1770146714
- Christine Conigliaro, LCSWClinical Social Worker1952501124
- Luis Cousin, M.D.Family Medicine Physician1477664936
Verify Andrew Tzellas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C183605Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,122 Medicare Part D claims for 255 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 14 claims were for opioids.
Most prescribed
- Atorvastatin Calcium225 claims
- Amlodipine Besylate123 claims
- Lisinopril91 claims
- Losartan Potassium66 claims
- Omeprazole63 claims
- Metformin Hcl61 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Andrew Tzellas among 17,696 internal medicine physician records in California
Andrew Tzellas, M.D is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2023 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
61 internal medicine physician records list a practice address in Napa
They are 61 of the 3,583 NPPES records with a practice address in Napa, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Napa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Abhijit Adhye, M.D.Napa, CA 945581992763205
- Scott Anderson, MDNapa, CA 945581619929494
- Patricia Dizmang, M.D.Napa, CA 945581194790261
- Beth Hartung, M.D.Napa, CA 945581275501488
- Ronald Julis, M.D.Napa, CA 945581053311167
- Paul Laband, MDNapa, CA 945581427029040
- Monica McKeever, MDNapa, CA 945581538135298
- Lane Melgarejo, MDNapa, CA 945581588657308
Common questions
What is Andrew Tzellas, M.D's NPI number?
Andrew Tzellas, M.D's National Provider Identifier (NPI) is 1003996042, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Andrew Tzellas, M.D located?
The NPPES record lists a practice address at 1141 Pear Tree LN Ste 100, Napa, CA, 94558. Phone: (707) 254-1770. Providers update this record themselves, so call before visiting.
How can I verify Andrew Tzellas, M.D's license?
NPPES lists California license number C183605, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrew Tzellas, M.D prescribe under Medicare Part D?
In 2024, Andrew Tzellas, M.D had 2,122 Medicare Part D claims for 255 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.