Top Companion Anim Med
Antibodies, BacterialBorrelia burgdorferiDog Diseases
Dr. Thomas Patrick O'Connor, MD
NPI1619066859
- Medicare services, 2024
- 137
- Medicare patients, 2024
- 96
- Part D claims, 2024
- 1,481
- Publications
- 9
- Affiliated sites
- 2
- Practice address
- 1500 E Medical Center Dr, Ann Arbor, MI 48109
- Practice phone
- Call (734) 936-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University Hospital
School-Based Health Center · Ann Arbor, Michigan
Find Dr. O'Connor's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Thomas Patrick O'Connor is an internist in Ann Arbor, Michigan
Dr. O'Connor practices at University Hospital in Ann Arbor, Michigan.
Dr. O'Connor's NPI, 1619066859, was assigned on October 12, 2006. Dr. O'Connor holds Michigan license 4301047205.
NPI and contact details
- NPI
- 1619066859NPI Registry (opens in a new tab)
- NPI enumeration date
- October 12, 2006
- NPI status
- Active
- Practice phone
- (734) 936-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 71
- Medical school graduation
- 1981
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Thomas Patrick O'Connor practices at University Hospital in Ann Arbor, Michigan
Dr. O'Connor's primary practice is University Hospital, at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The practice phone is (734) 936-4000.
- University Hospital1500 E Medical Center Dr, Ann Arbor, MI 48109Phone(734) 936-4000
Source: Dmand AI Affiliation Data
Dr. Thomas Patrick O'Connor is affiliated with 2 sites of care and 1 medical group
Dr. O'Connor's primary practice is University Hospital in Ann Arbor, Michigan. The medical group on file is University of Michigan Health. Dmand AI also links Dr. O'Connor to 1 more group practice or clinic, named with a free account. Dr. O'Connor's employer is on file too: a school & student health.
University HospitalPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Thomas Patrick O'Connor's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Connor practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. O'Connor practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Thomas Patrick O'Connor is one of 4,804 internists in Michigan
Internal medicine is Dr. O'Connor's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. O'Connor is licensed in Michigan.
Specialties and state licenses
- Internal medicine, MichiganPrimary
Internists near Dr. O'Connor
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Thomas Patrick O'Connor billed Medicare for 137 services in 2024
CMS data shows 137 Medicare services from Dr. O'Connor across 2 procedure codes in 2024, for 96 Medicare patients. Medicare paid $9,301 for them. Every service was in an office.
Medicare services, 2024137
Medicare patients96
Paid by Medicare$9,301
Procedure codes2
Dr. O'Connor's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,0352024: 10790%
- Other services
- 2023: 3562024: 3092%
- Tests and treatments
- 2023: 132024: 0100%
Dr. O'Connor compared with the Michigan median for internists, 2024
- Dr. O'Connor
- Michigan median
- Medicare services
- 137vs 42368% below
- Medicare patients
- 96vs 15940% below
- Part D claims
- 1,205vs 3143.8 times
Medians across 4,524 internists in Michigan with Dmand AI profiles that report each measure.
Dr. O'Connor's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. O'Connor?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. O'Connor and other internists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas Patrick O'Connor treated 96 Medicare patients in 2024, average age 77
CMS counts 96 Medicare patients who saw Dr. O'Connor in 2024. The largest group is 65 to 74, with 43 patients. 73% of them have high cholesterol, and 68% have high blood pressure. Their average risk score is 1.26, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Connor's median patient age at 75, with 41% women.
Medicare patients, 202496
Average age77
Average risk score1.26
Dr. O'Connor's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. O'Connor's Medicare patients by sex, 2024
- Women4143%
- Men5557%
Chronic conditions among Dr. O'Connor's Medicare patients, 2024
- High cholesterol73%
- High blood pressure68%
- Arthritis42%
- Diabetes25%
- Ischemic heart disease25%
- Cancer24%
- Atrial fibrillation22%
- Chronic kidney disease18%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Connor's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 75
Patient panel by sex, all payers
- Women41%
- Men59%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas Patrick O'Connor wrote 1,481 Medicare Part D claims in 2024
In 2024, Dr. O'Connor wrote 1,481 Medicare Part D claims for 196 patients. 90% of them were for generic drugs. CMS names the drug for 1,205 of them, across 32 drugs with 11 or more claims each, at $85,098 in total drug cost. In 2023, CMS named 1,669 claims across 38 drugs.
Part D claims, 20241,481
Drugs named by CMS32
Total drug cost$85,098
Part D patients196
Dr. O'Connor's Part D claims by kind of drug, 2024
- Generic1,332 claims90%
- Brand-name136 claims9%
- Other13 claims1%
Dr. O'Connor's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. O'Connor's Part D claims, 2024
- Opioids1%19 of 1,481 claims
- Antibiotics1%17 of 1,481 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,6692024: 1,20528%
Drugs named by CMS: 32 in 2024, 38 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
Find internists like Dr. O'Connor by procedure volume and prescribing
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Thomas Patrick O'Connor has 9 publications on record
Dmand AI links 9 papers to Dr. O'Connor, published from 2013 to 2019. 2017 was the busiest year, with 2. The most frequent topics are Dog Diseases, Dogs and Enzyme-Linked Immunosorbent Assay. Dr. O'Connor has published most often in Am J Vet Res.
Papers9
Years published2013 to 2019
Dr. O'Connor's papers by year, 2013 to 2019
Topics Dr. O'Connor writes about most
- Dog Diseases
- Dogs
- Enzyme-Linked Immunosorbent Assay
- Antibodies, Bacterial
- Borrelia burgdorferi
- Lyme Disease
- Ehrlichiosis
- Tick-Borne Diseases
Recent publications by Dr. O'Connor
J Vet Diagn Invest
AnaplasmaAnaplasma phagocytophilumAnaplasmosis
J Vet Diagn Invest
CatsEnzyme-Linked Immunosorbent AssayLeukemia, Feline
See who Dr. O'Connor researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. O'Connor works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Sources for Dr. Thomas Patrick O'Connor's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Thomas Patrick O'Connor
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Thomas Patrick O'Connor's NPI number?
Dr. Thomas Patrick O'Connor's NPI number is 1619066859. It was assigned on October 12, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Patrick O'Connor?
Dr. Thomas Patrick O'Connor is an internist in Ann Arbor, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Thomas Patrick O'Connor practice?
Dr. O'Connor practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. Dr. O'Connor's primary practice is University Hospital in Ann Arbor, Michigan. Dmand AI also links Dr. O'Connor to 1 group practice or clinic.
What is Dr. Thomas Patrick O'Connor's office phone number?
The practice phone on file for Dr. O'Connor is (734) 936-4000.
What is Dr. Thomas Patrick O'Connor's medical license number?
Dr. O'Connor holds Michigan license 4301047205.
What medical group is Dr. Thomas Patrick O'Connor part of?
Dr. O'Connor is linked to University of Michigan Health.
Does Dr. Thomas Patrick O'Connor accept Medicare?
Yes. CMS data shows Dr. O'Connor billed Medicare for 137 services in 2024.
How many Medicare patients does Dr. Thomas Patrick O'Connor see?
CMS counts 96 Medicare patients who saw Dr. O'Connor in 2024, with an average age of 77.
What services does Dr. Thomas Patrick O'Connor bill to Medicare?
In 2024, Dr. O'Connor's most billed Medicare services were office visit, established patient (99214) and medicare service (G0439).
What drugs does Dr. Thomas Patrick O'Connor prescribe most?
In 2024 Medicare Part D data, Dr. O'Connor's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
How long has Dr. Thomas Patrick O'Connor been practicing?
Dr. O'Connor graduated from medical school in 1981, 45 years ago.
Does Dr. Thomas Patrick O'Connor do research?
Dmand AI links 9 publications to Dr. O'Connor, published from 2013 to 2019.
Selling to internal medicine practices?
See internists in Michigan by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card