Mary Kathryn O'Connor, M.D.
Internal Medicine Physician · Newark, NJ
Mary Kathryn O'Connor, M.D. is an internal medicine physician with a practice address in Newark, New Jersey, and NPI 1598119562, issued on Apr 15, 2016. Check the license (New Jersey 25MA10829300, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Mary Kathryn O'Connor
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 25MA10829300 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 150 Bergen St, Newark, NJ 07103
- Phone
- (973) 972-6056
- Enumerated
- Apr 15, 2016
- Record last updated
- Jul 23, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210722002227); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Also registered at 150 Bergen St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary Kathryn O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA10829300Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
68% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,025 Medicare Part D claims for 126 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium75 claims
- Amlodipine Besylate62 claims
- Albuterol Sulfate Hfa39 claims
- Gabapentin39 claims
- Pantoprazole Sodium34 claims
- Metformin Hcl33 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.
The MIPS final score for 2023 (Medicare payment program): 93.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Rutgers Health-Rwj Primary Medicine GroupNew Brunswick, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Kathryn O'Connor among 4,632 internal medicine physician records in New Jersey
Mary Kathryn O'Connor, M.D. is one of 4,632 internal medicine physician records with a practice address in New Jersey. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 79% of them.
- NPI issued2016 · 79% of these records are older, 18% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2016 · median 2000 among the 3,132 with a school on file
- Record last updated2021 · 63% 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 New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
184 internal medicine physician records list a practice address in Newark
They are 184 of the 4,875 NPPES records with a practice address in Newark, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in Newark → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Suzanne Atkin, M.D.Newark, NJ 071031285669721
- Marianne Camargo, M.D.Newark, NJ 071031912166950
- Mary Cantey, M.D.Newark, NJ 071031851422687
- Dorothy Castro, MDNewark, NJ 071031982848297
- Irene Hao, MDNewark, NJ 071031598807521
- Iris Herrera, M.D.Newark, NJ 071031457446643
- Neil Kothari, M.D.Newark, NJ 071031639100233
- Ana Natale-Pereira, M.D.Newark, NJ 071031215949342
Common questions
What is Mary Kathryn O'Connor, M.D.'s NPI number?
Mary Kathryn O'Connor, M.D.'s National Provider Identifier (NPI) is 1598119562, issued on Apr 15, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Mary Kathryn O'Connor, M.D. located?
The NPPES record lists a practice address at 150 Bergen St, Newark, NJ, 07103. Phone: (973) 972-6056. Providers update this record themselves, so call before visiting.
How can I verify Mary Kathryn O'Connor, M.D.'s license?
NPPES lists New Jersey license number 25MA10829300, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Kathryn O'Connor, M.D. prescribe under Medicare Part D?
In 2024, Mary Kathryn O'Connor, M.D. had 1,025 Medicare Part D claims for 126 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Mary Kathryn O'Connor, M.D.'s MIPS final score?
The 2023 MIPS final score is 93.7 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.