Dr. Thomas Patrick O'Connor Jr., MD
- Medicare services, 2024
- 1,777
- Medicare patients, 2024
- 811
- Part D claims, 2024
- 2,355
- MIPS score, 2024
- 84
- Hospital affiliations
- 3
- Practice address
- 101 Columbian Street, South Weymouth, MA 02190
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Breast Care Center - HOPD
Acute Care Hospital outpatient department · South Weymouth, Massachusetts
Find Dr. O'Connor's professional email, personal email and mobile number
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Dr. Thomas Patrick O'Connor Jr. is an internist in South Weymouth, Massachusetts
Dr. O'Connor practices at Breast Care Center - HOPD in South Weymouth, Massachusetts.
Dr. O'Connor's NPI, 1669507141, was assigned on February 23, 2007. Dr. O'Connor graduated from State University of New York at Buffalo School of Medicine in 2001. Dr. O'Connor holds District of Columbia license MD035011.
- NPI
- 1669507141NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4880795145
- NPI enumeration date
- February 23, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Thomas Patrick O'Connor Jr. practices at Breast Care Center - HOPD in South Weymouth, Massachusetts
Dr. O'Connor's primary practice is Breast Care Center - HOPD, at 101 Columbian Street, South Weymouth, MA 02190.
- Breast Care Center - HOPD101 Columbian Street, South Weymouth, MA 02190
Source: Dmand AI Affiliation Data
Dr. Thomas Patrick O'Connor Jr. is affiliated with 9 sites of care and 1 medical group
Dr. O'Connor's primary practice is Breast Care Center - HOPD in South Weymouth, Massachusetts. Dr. O'Connor is also affiliated with Dana-Farber Cancer Institute. The medical group on file is Binney Medical Group. Dmand AI also links Dr. O'Connor to 2 more hospitals, 3 home health agencies, 1 group practice or clinic and 1 hospice, each named with a free account. Dr. O'Connor's employer is on file too: a hospital.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Thomas Patrick O'Connor Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. O'Connor practices, 9 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Breast Care Center - HOPD | Available with a free account |
| +8 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Thomas Patrick O'Connor Jr. is one of 5,528 internists in Massachusetts
Internal medicine is Dr. O'Connor's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. O'Connor's licenses on file in 2 states: District of Columbia and Massachusetts.
Specialties and state licenses
- Internal medicine, District of ColumbiaPrimary
- Hematology and oncology, Massachusetts
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 Jr. billed Medicare for 1,777 services in 2024
CMS data shows 1,777 Medicare services from Dr. O'Connor across 6 procedure codes in 2024, for 811 Medicare patients. Medicare paid $112,792 for them.
Dr. O'Connor's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1,7202024: 1,7773%
Where Dr. O'Connor's Medicare services took place, 2024
- In an office1,76199%
- In a facility161%
Dr. O'Connor compared with the Massachusetts median for internists, 2024
- Dr. O'Connor
- Massachusetts median
- Medicare services
- 1,777vs 4314.1 times
- Medicare patients
- 811vs 1944.2 times
- Part D claims
- 2,036vs 4025.1 times
Medians across 5,369 internists in Massachusetts 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Thomas Patrick O'Connor Jr. treated 811 Medicare patients in 2024, average age 77
CMS counts 811 Medicare patients who saw Dr. O'Connor in 2024. The largest group is 75 to 84, with 376 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.80, 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'Connor's median patient age at 75, with 34% women.
Dr. O'Connor's Medicare patients by age, 2024
Dr. O'Connor's Medicare patients by sex, 2024
- Women30137%
- Men51063%
Chronic conditions among Dr. O'Connor's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Cancer65%
- Arthritis44%
- Chronic kidney disease30%
- Ischemic heart disease30%
- Anxiety29%
- Diabetes26%
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
- Women34%
- Men64%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Thomas Patrick O'Connor Jr. wrote 2,355 Medicare Part D claims in 2024
In 2024, Dr. O'Connor wrote 2,355 Medicare Part D claims for 337 patients. 80% of them were for generic drugs. CMS names the drug for 2,036 of them, across 46 drugs with 11 or more claims each, at $4,858,680 in total drug cost. In 2023, CMS named 1,556 claims across 37 drugs.
Dr. O'Connor's Part D claims by kind of drug, 2024
- Generic1,878 claims80%
- Brand-name477 claims20%
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
- Opioids10%246 of 2,355 claims
- Antibiotics3%62 of 2,355 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: 1,5562024: 2,03631%
Drugs named by CMS: 46 in 2024, 37 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
Dr. Thomas Patrick O'Connor Jr. scored 84 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 84 out of 100 for Dr. O'Connor for performance year 2024, reported as part of a group. Dr. O'Connor accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. O'Connor as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. O'Connor's MIPS scores, performance year 2024
- 84of 100Final score
- 65of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 69of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Thomas Patrick O'Connor Jr. received $228 in industry payments from 2016 to 2025
CMS Open Payments shows 5 general payments to Dr. O'Connor from 4 drug and device companies from 2016 to 2025. Education make up the largest share, 51% of the total. Janssen Pharmaceuticals, Inc paid the most, $121.
General payments to Dr. O'Connor by program year, 2016 to 2025
General payments to Dr. O'Connor by kind, 2016 to 2025
- Education$11751%
- Food and beverage$11149%
Companies that paid Dr. O'Connor the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Thomas Patrick O'Connor Jr. graduated from State University of New York at Buffalo School of Medicine
Dr. O'Connor graduated from State University of New York at Buffalo School of Medicine in 2001.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Thomas Patrick O'Connor Jr.'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 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (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 Patrick O'Connor Jr.
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 Jr.'s NPI number?
Dr. Thomas Patrick O'Connor Jr.'s NPI number is 1669507141. It was assigned on February 23, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Patrick O'Connor Jr.?
Dr. Thomas Patrick O'Connor Jr. is an internist in South Weymouth, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Thomas Patrick O'Connor Jr. practice?
Dr. O'Connor practices at 101 Columbian Street, South Weymouth, MA 02190. Dr. O'Connor's primary practice is Breast Care Center - HOPD in South Weymouth, Massachusetts. Dmand AI also links Dr. O'Connor to 2 hospitals, 3 home health agencies, 1 group practice or clinic and 1 hospice.
What is Dr. Thomas Patrick O'Connor Jr.'s medical license number?
Dr. O'Connor holds District of Columbia license MD035011, one of the licenses on file in 2 states.
Which states has Dr. Thomas Patrick O'Connor Jr. been licensed in?
Dmand AI has state licenses on file for Dr. O'Connor in District of Columbia and Massachusetts.
Which hospitals is Dr. Thomas Patrick O'Connor Jr. affiliated with?
Dr. O'Connor is affiliated with Dana-Farber Cancer Institute. Dmand AI links Dr. O'Connor to 2 more hospitals.
What medical group is Dr. Thomas Patrick O'Connor Jr. part of?
Dr. O'Connor is linked to Binney Medical Group.
Does Dr. Thomas Patrick O'Connor Jr. accept Medicare?
Yes. CMS data shows Dr. O'Connor billed Medicare for 1,777 services in 2024, and Dr. O'Connor accepts Medicare assignment.
Does Dr. Thomas Patrick O'Connor Jr. offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. O'Connor as offering telehealth services.
What is Dr. Thomas Patrick O'Connor Jr.'s MIPS score?
Dr. O'Connor's MIPS final score for performance year 2024 is 84 out of 100, reported as part of a group.
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How many Medicare patients does Dr. Thomas Patrick O'Connor Jr. see?
CMS counts 811 Medicare patients who saw Dr. O'Connor in 2024, with an average age of 77.
What services does Dr. Thomas Patrick O'Connor Jr. bill to Medicare?
In 2024, Dr. O'Connor's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and office visit, new patient (99205).
Where did Dr. Thomas Patrick O'Connor Jr. go to medical school?
Dr. O'Connor graduated from State University of New York at Buffalo School of Medicine in 2001.
What drugs does Dr. Thomas Patrick O'Connor Jr. prescribe most?
In 2024 Medicare Part D data, Dr. O'Connor's most prescribed drugs by claims were Prednisone, Abiraterone Acetate and Letrozole.
Has Dr. Thomas Patrick O'Connor Jr. received payments from drug or device companies?
CMS Open Payments shows $228 in general payments to Dr. O'Connor from 4 companies from 2016 to 2025. The largest total came from Janssen Pharmaceuticals, Inc.
How long has Dr. Thomas Patrick O'Connor Jr. been practicing?
Dr. O'Connor graduated from medical school in 2001, 25 years ago.
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