Peter Thomas Anastassiou, M.D.
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · San Francisco, CA
Peter Thomas Anastassiou, M.D. is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in San Francisco, California, and NPI 1912904806, issued on Jul 7, 2005. Check the license (California A43203, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Peter Thomas Anastassiou
- Credential
- M.D.
- Primary taxonomy
- Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
- License number
- A43203 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2100 Webster St, San Francisco, CA 94115
- Phone
- (415) 600-7860
- Enumerated
- Jul 7, 2005
- Record last updated
- Jun 10, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (415) 600-7865
- Medicaid ID
- 00A432030 CA
- Medicare enrollment
- Enrolled (PECOS I20040401001745); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest thoracic surgery (cardiothoracic vascular surgery) physician records → All 634 in California → Look up another NPI →
Also registered at 2100 Webster St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Arthur Allen, MDOphthalmology Physician1255332334
- Anait Ambarian, ODOptometrist1992032411
- William Andereck, M.D.Internal Medicine Physician1699800219
- Jennifer Austin, LCSWClinical Social Worker1669878492
- Amy Baertson, R.DRegistered Dietitian1598914202
- Barry Baron, MDSpecialist1467563353
Verify Peter Thomas Anastassiou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A43203Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average thoracic surgery (cardiothoracic vascular surgery) physician in 2024
30 Medicare Part D claims for 20 beneficiaries, against an average of 101 among the 2,587 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Peter Thomas Anastassiou among 634 thoracic surgery (cardiothoracic vascular surgery) physician records in California
Peter Thomas Anastassiou, M.D. is one of 634 thoracic surgery (cardiothoracic vascular surgery) physician records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1983 · median 1997 among the 408 with a school on file
- Record last updated2015 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208G00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers in California
There are 634 thoracic surgery (cardiothoracic vascular surgery) physician records in California.
All 634 in California → Every provider in San Francisco → Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician nationwide →
The 8 thoracic surgery (cardiothoracic vascular surgery) physician records with the nearest ZIP codes
- Nora Burgess, MDSan Francisco, CA 941151417035049
- Brian Cain, MDSan Francisco, CA 941151205914900
- Keith Flachsbart, MDSan Francisco, CA 941151033297627
- Paul Lapunzina, MDSan Francisco, CA 941151720152333
- Hugh Mason, MDSan Francisco, CA 941151316025927
- Vicken Melikian, MDSan Francisco, CA 941151225116841
- Mario Pompili, MDSan Francisco, CA 941151154409795
- Richard Richter, MDSan Francisco, CA 941151730253345
Common questions
What is Peter Thomas Anastassiou, M.D.'s NPI number?
Peter Thomas Anastassiou, M.D.'s National Provider Identifier (NPI) is 1912904806, issued on Jul 7, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Peter Thomas Anastassiou, M.D. located?
The NPPES record lists a practice address at 2100 Webster St, San Francisco, CA, 94115. Phone: (415) 600-7860. Providers update this record themselves, so call before visiting.
How can I verify Peter Thomas Anastassiou, M.D.'s license?
NPPES lists California license number A43203, 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 Peter Thomas Anastassiou, M.D. prescribe under Medicare Part D?
In 2024, Peter Thomas Anastassiou, M.D. had 30 Medicare Part D claims for 20 beneficiaries; the average among thoracic surgery (cardiothoracic vascular surgery) physician prescribers was 101. 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.