Dr. John J. O'Connor Jr., MD
- Medicare services, 2024
- 376
- Medicare patients, 2024
- 413
- MIPS score, 2024
- 87
- Hospital affiliations
- 2
- Medical groups
- 2
- Practice address
- 55 Fogg Road, South Weymouth, MA 02190
- Practice phone
- Call (781) 340-8000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. John J. O'Connor Jr. is an anesthesiologist in South Weymouth, Massachusetts
Dr. O'Connor practices at South Shore Hospital in South Weymouth, Massachusetts, part of South Shore Health System.
Dr. O'Connor's NPI, 1295988921, was assigned on October 26, 2008. Dr. O'Connor holds Massachusetts license 238964.
- NPI
- 1295988921NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3779637780
- NPI enumeration date
- October 26, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (781) 340-8000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John J. O'Connor Jr. practices at South Shore Hospital in South Weymouth, Massachusetts
Dr. O'Connor's primary practice is South Shore Hospital, at 55 Fogg Road, South Weymouth, MA 02190 in Norfolk County. The practice phone is (781) 340-8000.
- South Shore Hospital55 Fogg Road, South Weymouth, MA 02190 · Norfolk CountyPhone(781) 340-8000
Source: Dmand AI Affiliation Data
Dr. John J. O'Connor Jr. is affiliated with 2 sites of care and 2 medical groups
Dr. O'Connor's primary practice is South Shore Hospital in South Weymouth, Massachusetts, part of South Shore Health System. Dr. O'Connor is also affiliated with UMass Memorial Medical Center - University Campus. The medical group on file is Coastal Medical Associates. Dmand AI also links Dr. O'Connor to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John J. O'Connor Jr.'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 |
|---|---|
| South Shore Hospital | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John J. O'Connor Jr. is one of 1,552 anesthesiologists in Massachusetts
Anesthesiology is Dr. O'Connor's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. O'Connor is licensed in Massachusetts.
Specialties and state licenses
- Anesthesiology, MassachusettsPrimary
Anesthesiologists near Dr. O'Connor
Counts of anesthesiologists 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. John J. O'Connor Jr. billed Medicare for 376 services in 2024
CMS data shows 376 Medicare services from Dr. O'Connor across 19 procedure codes in 2024, for 413 Medicare patients. Medicare paid $27,302 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. O'Connor's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 2482024: 28013%
- Surgery
- 2023: 642024: 5613%
- Imaging
- 2023: 272024: 4048%
Dr. O'Connor compared with the Massachusetts median for anesthesiologists, 2024
- Dr. O'Connor
- Massachusetts median
- Medicare services
- 376vs 1263.0 times
- Medicare patients
- 413vs 2002.1 times
Medians across 1,366 anesthesiologists 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. John J. O'Connor Jr. treated 413 Medicare patients in 2024, average age 74
CMS counts 413 Medicare patients who saw Dr. O'Connor in 2024. The largest group is 65 to 74, with 187 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 14% are also on Medicaid. Their average risk score is 1.34, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. O'Connor's median patient age at 54, with 60% women.
Dr. O'Connor's Medicare patients by age, 2024
Dr. O'Connor's Medicare patients by sex, 2024
- Women21853%
- Men19547%
Chronic conditions among Dr. O'Connor's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis59%
- Anxiety34%
- Ischemic heart disease29%
- Mood disorders29%
- Diabetes28%
- Chronic kidney disease26%
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 54
Patient panel by sex, all payers
- Women60%
- Men38%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John J. O'Connor Jr. scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 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.
- Accepts Medicare assignment
- Yes
Dr. O'Connor's MIPS scores, performance year 2024
- 87of 100Final score
- 88.1of 100Quality
- 71of 100Promoting Interoperability
- 40of 100Improvement Activities
- 78of 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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Sources for Dr. John J. 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 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) |
| 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) |
| 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. John J. 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. John J. O'Connor Jr.'s NPI number?
Dr. John J. O'Connor Jr.'s NPI number is 1295988921. It was assigned on October 26, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. John J. O'Connor Jr.?
Dr. John J. O'Connor Jr. is an anesthesiologist in South Weymouth, Massachusetts. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. John J. O'Connor Jr. practice?
Dr. O'Connor practices at 55 Fogg Road, South Weymouth, MA 02190. Dr. O'Connor's primary practice is South Shore Hospital in South Weymouth, Massachusetts, part of South Shore Health System. Dmand AI also links Dr. O'Connor to 1 medical group.
What is Dr. John J. O'Connor Jr.'s office phone number?
The practice phone on file for Dr. O'Connor is (781) 340-8000.
What is Dr. John J. O'Connor Jr.'s medical license number?
Dr. O'Connor holds Massachusetts license 238964.
Which hospitals is Dr. John J. O'Connor Jr. affiliated with?
Dr. O'Connor practices at South Shore Hospital in South Weymouth, Massachusetts. Dr. O'Connor is also affiliated with UMass Memorial Medical Center - University Campus.
What medical group is Dr. John J. O'Connor Jr. part of?
Dr. O'Connor is linked to Coastal Medical Associates. Dmand AI links Dr. O'Connor to 1 more medical group.
Does Dr. John J. O'Connor Jr. accept Medicare?
Yes. CMS data shows Dr. O'Connor billed Medicare for 376 services in 2024, and Dr. O'Connor accepts Medicare assignment.
What is Dr. John J. O'Connor Jr.'s MIPS score?
Dr. O'Connor's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
How many Medicare patients does Dr. John J. O'Connor Jr. see?
CMS counts 413 Medicare patients who saw Dr. O'Connor in 2024, with an average age of 74.
What services does Dr. John J. O'Connor Jr. bill to Medicare?
In 2024, Dr. O'Connor's most billed Medicare services were anesthesia (01810), ultrasound (76942) and surgery: brain, spine and nerves (64415).
How long has Dr. John J. O'Connor Jr. been practicing?
Dr. O'Connor graduated from medical school in 2005, 21 years ago.
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