NPPES file of Aug 9, 2026

James O'Brien, NP

Nurse Practitioner · Boston, MA

James O'Brien, NP is a nurse practitioner with a practice address in Boston, Massachusetts, and NPI 1558101964, issued on May 31, 2024. Check the license (Massachusetts RN2380433, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1558101964
Name
James O'Brien
Credential
NP
Primary taxonomy
Nurse Practitioner 363L00000X
License numbers
RN2380433 MA
F354034-01 NY
Self-reported in NPPES; status is on the state search
Practice location
18 Newbury St FL 5, Boston, MA 02116
Phone
(617) 304-1965
Enumerated
May 31, 2024
Record last updated
Sep 9, 2024
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest nurse practitioner records → All 3,480 in Massachusetts → Look up another NPI →

Also registered at 18 Newbury St FL 5

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Andrew Shin, PAPhysician Assistant1588447080
  2. Steven Zivich, MDFamily Medicine Physician1841589231

Verify James O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
    Search for license RN2380433    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Massachusetts license search

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99% fewer Medicare Part D claims than the average nurse practitioner in 2024

12 Medicare Part D claims, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.

  1. James O'Brien12
  2. Specialty average1,109

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.

James O'Brien among 3,480 nurse practitioner records in Massachusetts

James O'Brien, NP is one of 3,480 nurse practitioner records with a practice address in Massachusetts. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2024, is newer than 91% of them.

  • NPI issued2024 · 91% of these records are older, 5% newer
  • In a Medicare fileYes · 71% of these records are
  • In the CMS Doctors and Clinicians fileNo · 56% of these records are
  • Record last updated2024 · 52% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

961 nurse practitioner records list a practice address in Boston

They are 961 of the 41,865 NPPES records with a practice address in Boston, and 3,480 nurse practitioner records in Massachusetts.

All 3,480 in Massachusetts → Every provider in Boston → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Tara Biller, FNP-BCBoston, MA 021161639585086
  2. Ashley Hilmes, NPBoston, MA 021161962962829
  3. Alexandra Paz, NPBoston, MA 021161366058463
  4. Stephanie AramiBoston, MA 021151720925936
  5. Sybil Bleus, AGPCNP-BCBoston, MA 021151023882818
  6. Melody Brown, FNP-CBoston, MA 021151114733755
  7. Jessica Dalusma, NPBoston, MA 021151710613583
  8. Stephanie Desroches, NPBoston, MA 021151427736008

Common questions

What is James O'Brien, NP's NPI number?

James O'Brien, NP's National Provider Identifier (NPI) is 1558101964, issued on May 31, 2024. An NPI identifies a provider in billing; it is not a license.

Where is James O'Brien, NP located?

The NPPES record lists a practice address at 18 Newbury St FL 5, Boston, MA, 02116. Phone: (617) 304-1965. Providers update this record themselves, so call before visiting.

How can I verify James O'Brien, NP's license?

NPPES lists Massachusetts license number RN2380433, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.

How much does James O'Brien, NP prescribe under Medicare Part D?

In 2024, James O'Brien, NP had 12 Medicare Part D claims; the average among nurse practitioner prescribers was 1,109. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.