Marissa Loren O'Connor, PA-C
Physician Assistant · Saint James, NY
Marissa Loren O'Connor, PA-C is a physician assistant with a practice address in Saint James, New York, and NPI 1588317259, issued on Feb 1, 2022. Check the license with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marissa Loren O'Connor
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 18 Damin Cir, Saint James, NY 11780
- Phone
- (631) 617-2558
- Enumerated
- Feb 1, 2022
- Record last updated
- Feb 1, 2022
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 15,555 in New York → Look up another NPI →
Verify Marissa Loren O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average physician assistant in 2024
72 Medicare Part D claims for 45 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
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.
Marissa Loren O'Connor among 15,555 physician assistant records in New York
Marissa Loren O'Connor, PA-C is one of 15,555 physician assistant records with a practice address in New York. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 71% of them.
- NPI issued2022 · 71% of these records are older, 23% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 52% of these records are
- Record last updated2022 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 physician assistant records list a practice address in Saint James
They are 3 of the 258 NPPES records with a practice address in Saint James, and 15,555 physician assistant records in New York.
All 15,555 in New York → Every provider in Saint James → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Paul Cella, PASaint James, NY 117801447572714
- Andrew OswaldSaint James, NY 117801710775739
- Kristin AlfanoRonkonkoma, NY 117791356012280
- Alicia AndersonRonkonkoma, NY 117791104584622
- Carmela Bayer, PA-CLake Ronkonkoma, NY 117791285446609
- Sonia Gracia, PA-CRonkonkoma, NY 117791922675396
- Ahmad Halimi, PARonkonkoma, NY 117791750892345
- Brittany Kiss, PA-C, DATLake Ronkonkoma, NY 117791386197085
Common questions
What is Marissa Loren O'Connor, PA-C's NPI number?
Marissa Loren O'Connor, PA-C's National Provider Identifier (NPI) is 1588317259, issued on Feb 1, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Marissa Loren O'Connor, PA-C located?
The NPPES record lists a practice address at 18 Damin Cir, Saint James, NY, 11780. Phone: (631) 617-2558. Providers update this record themselves, so call before visiting.
How can I verify Marissa Loren O'Connor, PA-C's license?
Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Marissa Loren O'Connor, PA-C prescribe under Medicare Part D?
In 2024, Marissa Loren O'Connor, PA-C had 72 Medicare Part D claims for 45 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
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.