Thomas Sean Halligan, MD
Family Medicine Physician · Oakland, CA
Thomas Sean Halligan, MD is a family medicine physician with a practice address in Oakland, California, and NPI 1457454761, issued on Sep 6, 2006. Check the license (California A71870, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas Sean Halligan
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A71870 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1450 Fruitvale Ave, Oakland, CA 94601
- Phone
- (510) 535-2999
- Enumerated
- Sep 6, 2006
- Record last updated
- Dec 15, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (510) 535-4128
- Medicare enrollment
- Enrolled (PECOS I20050418000679); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 1998
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1450 Fruitvale Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- William Arredondo, LCSWClinical Social Worker1902936404
- P'Shana Bolden, LCSWClinical Social Worker1790084044
- Jessica GuerreroCommunity Health Worker1851664486
- Araceli HuertaCommunity Health Worker1790541159
- Danielle Jackson, PA-CPhysician Assistant1770711459
- Erin Rodden, FNPFamily Nurse Practitioner1710710231
Verify Thomas Sean Halligan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A71870Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% more Medicare Part D claims than the average family medicine physician in 2024
4,194 Medicare Part D claims for 335 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 55 claims were for opioids.
Most prescribed
- Atorvastatin Calcium385 claims
- Metformin Hcl Er166 claims
- Amlodipine Besylate165 claims
- Losartan Potassium156 claims
- Lisinopril136 claims
- Levothyroxine Sodium113 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.
Bills Medicare through one group practice
- Permanente Medical Group IncSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Sean Halligan among 17,133 family medicine physician records in California
Thomas Sean Halligan, MD is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1998 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Family Medicine Physician providers in California
There are 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Oakland → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Paul Bayard, MDOakland, CA 946011922101237
- Barbara Benzwi, MDOakland, CA 946011063512317
- Jaime Cortes, MDOakland, CA 946011265587778
- Asano Fertig, MDOakland, CA 946011013017268
- Christine Fratino, DOOakland, CA 946011841398542
- Irene Kelly, MDOakland, CA 946011386747509
- Jill LeggOakland, CA 946011881771624
- James Liang, D.O.Oakland, CA 946011780618322
Common questions
What is Thomas Sean Halligan, MD's NPI number?
Thomas Sean Halligan, MD's National Provider Identifier (NPI) is 1457454761, issued on Sep 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Sean Halligan, MD located?
The NPPES record lists a practice address at 1450 Fruitvale Ave, Oakland, CA, 94601. Phone: (510) 535-2999. Providers update this record themselves, so call before visiting.
How can I verify Thomas Sean Halligan, MD's license?
NPPES lists California license number A71870, 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 Thomas Sean Halligan, MD prescribe under Medicare Part D?
In 2024, Thomas Sean Halligan, MD had 4,194 Medicare Part D claims for 335 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.