Thomas Patrick O'Connor, MD
Internal Medicine Physician · Ann Arbor, MI
Thomas Patrick O'Connor, MD is an internal medicine physician with a practice address in Ann Arbor, Michigan, and NPI 1619066859, issued on Oct 12, 2006. Check the license (Michigan 4301047205, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Thomas Patrick O'Connor
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 4301047205 MI
Self-reported in NPPES; status is on the state search - Practice location
- 380 Parkland Plz, Ann Arbor, MI 48103
- Phone
- (734) 998-7207
- Enumerated
- Oct 12, 2006
- Record last updated
- Sep 17, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 1647962 MI
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 380 Parkland Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas Patrick O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301047205Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,481 Medicare Part D claims for 196 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 19 claims were for opioids.
Most prescribed
- Atorvastatin Calcium204 claims
- Amlodipine Besylate117 claims
- Lisinopril86 claims
- Losartan Potassium77 claims
- Levothyroxine Sodium76 claims
- Omeprazole60 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.
Thomas Patrick O'Connor among 5,735 internal medicine physician records in Michigan
Thomas Patrick O'Connor, MD is one of 5,735 internal medicine physician records with a practice address in Michigan. 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 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2019 · 54% 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 Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
479 internal medicine physician records list a practice address in Ann Arbor
They are 479 of the 15,616 NPPES records with a practice address in Ann Arbor, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Ann Arbor → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Laura Babe, M.D.Ann Arbor, MI 481031912986043
- James Bonnette, MDAnn Arbor, MI 481031629186689
- Lisa Feldstein, MDAnn Arbor, MI 481031578560454
- Kristin McFadden, D.O.Ann Arbor, MI 481031629009915
- Thomas O'Brien, M.D.Ann Arbor, MI 481031033188545
- Elisa Ostafin, MDAnn Arbor, MI 481031770672917
- Marlis Pacifico, M.D.Ann Arbor, MI 481031003924416
- Gary Peppin, M.D.Ann Arbor, MI 481031588676399
Common questions
What is Thomas Patrick O'Connor, MD's NPI number?
Thomas Patrick O'Connor, MD's National Provider Identifier (NPI) is 1619066859, issued on Oct 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Patrick O'Connor, MD located?
The NPPES record lists a practice address at 380 Parkland Plz, Ann Arbor, MI, 48103. Phone: (734) 998-7207. Providers update this record themselves, so call before visiting.
How can I verify Thomas Patrick O'Connor, MD's license?
NPPES lists Michigan license number 4301047205, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas Patrick O'Connor, MD prescribe under Medicare Part D?
In 2024, Thomas Patrick O'Connor, MD had 1,481 Medicare Part D claims for 196 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.