Dr. Thomas Neil O'Callaghan, MD
- Medicare services, 2024
- 36
- Medicare patients, 2024
- 48
- Part D claims, 2021
- 11
- Hospital affiliations
- 2
- Medical groups
- 3
- 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 in Ann Arbor
Ann Arbor, Michigan
Find Dr. O'Callaghan'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 Neil O'Callaghan is an internist in Ann Arbor, Michigan
Dr. O'Callaghan practices at University Hospital in Ann Arbor in Ann Arbor, Michigan.
Dr. O'Callaghan's NPI, 1265926331, was assigned on June 21, 2018. Dr. O'Callaghan graduated from University of Michigan Medical School in 2022. Dr. O'Callaghan holds Michigan license 4301507148.
- NPI
- 1265926331NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113273129
- NPI enumeration date
- June 21, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (734) 936-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 30
- Medical school graduation
- 2022
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas Neil O'Callaghan practices at University Hospital in Ann Arbor in Ann Arbor, Michigan
Dr. O'Callaghan's primary practice is University Hospital in Ann Arbor, at 1500 E Medical Center Dr, Ann Arbor, MI 48109 in Washtenaw County. The practice phone is (734) 936-4000.
- University Hospital in Ann Arbor1500 E Medical Center Dr, Ann Arbor, MI 48109 · Washtenaw CountyPhone(734) 936-4000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Thomas Neil O'Callaghan is affiliated with 3 sites of care and 3 medical groups
Dr. O'Callaghan's primary practice is University Hospital in Ann Arbor in Ann Arbor, Michigan. Dr. O'Callaghan is also affiliated with University Hospital. The medical group on file is University of Michigan Health. Dmand AI also links Dr. O'Callaghan to 1 more hospital and 2 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Thomas Neil O'Callaghan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Callaghan practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University Hospital in Ann Arbor | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas Neil O'Callaghan is one of 4,804 internists in Michigan
Internal medicine is Dr. O'Callaghan's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. O'Callaghan is licensed in Michigan.
Specialties and state licenses
- Internal medicine, MichiganPrimary
Internists near Dr. O'Callaghan
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 Neil O'Callaghan billed Medicare for 36 services in 2024
CMS data shows 36 Medicare services from Dr. O'Callaghan across 1 procedure code in 2024, for 48 Medicare patients. Medicare paid $4,842 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. O'Callaghan's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 602024: 3640%
Dr. O'Callaghan compared with the Michigan median for internists, 2024
- Dr. O'Callaghan
- Michigan median
- Medicare services
- 36vs 42391% below
- Medicare patients
- 48vs 15970% below
- Part D claims
- 11vs 31496% below
Medians across 4,524 internists in Michigan with Dmand AI profiles that report each measure.
Dr. O'Callaghan'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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas Neil O'Callaghan treated 48 Medicare patients in 2024, average age 71
CMS counts 48 Medicare patients who saw Dr. O'Callaghan in 2024. The largest group is 75 to 84, with 16 patients. 75% of them have high blood pressure, and 69% have high cholesterol. 23% are also on Medicaid. Their average risk score is 3.49, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. O'Callaghan's median patient age at 17, with 57% women.
Dr. O'Callaghan's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. O'Callaghan's Medicare patients by sex, 2024
- Women2756%
- Men2144%
Chronic conditions among Dr. O'Callaghan's Medicare patients, 2024
- High blood pressure75%
- High cholesterol69%
- Arthritis54%
- Anxiety52%
- Chronic kidney disease52%
- Heart failure50%
- Mood disorders50%
- Diabetes48%
Share of Medicare patients with each condition. A patient can have several.
Dr. O'Callaghan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 17
Patient panel by sex, all payers
- Women57%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas Neil O'Callaghan wrote 11 Medicare Part D claims in 2021
In 2021, Dr. O'Callaghan wrote 11 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $56 in total drug cost.
Dr. O'Callaghan's most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Thomas Neil O'Callaghan takes part in Medicare
Dr. O'Callaghan accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Thomas Neil O'Callaghan graduated from University of Michigan Medical School
Dr. O'Callaghan graduated from University of Michigan Medical School in 2022.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Thomas Neil O'Callaghan'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| 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 Neil O'Callaghan
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 Neil O'Callaghan's NPI number?
Dr. Thomas Neil O'Callaghan's NPI number is 1265926331. It was assigned on June 21, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Neil O'Callaghan?
Dr. Thomas Neil O'Callaghan 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 Neil O'Callaghan practice?
Dr. O'Callaghan practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. Dr. O'Callaghan's primary practice is University Hospital in Ann Arbor in Ann Arbor, Michigan. Dmand AI also links Dr. O'Callaghan to 1 hospital and 2 medical groups.
What is Dr. Thomas Neil O'Callaghan's office phone number?
The practice phone on file for Dr. O'Callaghan is (734) 936-4000.
What is Dr. Thomas Neil O'Callaghan's medical license number?
Dr. O'Callaghan holds Michigan license 4301507148.
Which hospitals is Dr. Thomas Neil O'Callaghan affiliated with?
Dr. O'Callaghan is affiliated with University Hospital. Dmand AI links Dr. O'Callaghan to 1 more hospital.
What medical group is Dr. Thomas Neil O'Callaghan part of?
Dr. O'Callaghan is linked to University of Michigan Health. Dmand AI links Dr. O'Callaghan to 2 more medical groups.
Does Dr. Thomas Neil O'Callaghan accept Medicare?
Yes. CMS data shows Dr. O'Callaghan billed Medicare for 36 services in 2024, and Dr. O'Callaghan accepts Medicare assignment.
How many Medicare patients does Dr. Thomas Neil O'Callaghan see?
CMS counts 48 Medicare patients who saw Dr. O'Callaghan in 2024, with an average age of 71.
What services does Dr. Thomas Neil O'Callaghan bill to Medicare?
In 2024, Dr. O'Callaghan's most billed Medicare services were hospital inpatient care (99223).
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Where did Dr. Thomas Neil O'Callaghan go to medical school?
Dr. O'Callaghan graduated from University of Michigan Medical School in 2022.
What drugs does Dr. Thomas Neil O'Callaghan prescribe most?
In 2021 Medicare Part D data, Dr. O'Callaghan's most prescribed drugs by claims were Famotidine.
How long has Dr. Thomas Neil O'Callaghan been practicing?
Dr. O'Callaghan graduated from medical school in 2022, 4 years ago.
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