NPPES file of Aug 9, 2026

Margaret Theresa O'Connor, APRN BC

Adult Health Nurse Practitioner · Boston, MA

Margaret Theresa O'Connor, APRN BC is an adult health nurse practitioner with a practice address in Boston, Massachusetts, and NPI 1922216415, issued on May 18, 2007. Check the license (Massachusetts RN 155860 NP, 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
1922216415
Name
Margaret Theresa O'Connor
Credential
APRN BC
Primary taxonomy
Adult Health Nurse Practitioner 363LA2200X
License number
RN 155860 NP MA
Self-reported in NPPES; status is on the state search
Practice location
750 Washington Street, Boston, MA 02111
Phone
(617) 636-7889
Enumerated
May 18, 2007
Record last updated
Mar 3, 2011 (not updated in 15 years: call before relying on the address or phone)
Fax
(617) 636-6403
Medicare enrollment
Enrolled (PECOS I20051121000277); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest adult health nurse practitioner records → All 1,465 in Massachusetts → Look up another NPI →

Also registered at 750 Washington Street

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

  1. Robert Blaustein, M.D.Cardiovascular Disease Physician1447298740
  2. Peter Bonis, M.D.Gastroenterology Physician1548462807
  3. David Cherniak, M.D.Diagnostic Radiology Physician1780621987
  4. Joseph Creedon, PA-CMedical Physician Assistant1184853426
  5. Amir Darvish, MDEmergency Medicine Physician1386717783
  6. David Denofrio, M.D.Advanced Heart Failure and Transplant Cardiology Physician1679679997

Verify Margaret Theresa O'Connor 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 RN 155860 NP    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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35% fewer Medicare Part D claims than the average adult health nurse practitioner in 2024

835 Medicare Part D claims for 219 beneficiaries, against an average of 1,280 among the 16,937 providers of this specialty who prescribed in Part D. 49 claims were for opioids.

  1. Margaret O'Connor835
  2. Specialty average1,280

Most prescribed

  1. Amlodipine Besylate49 claims
  2. Atorvastatin Calcium47 claims
  3. Gabapentin46 claims
  4. Omeprazole41 claims
  5. Lisinopril40 claims
  6. Eliquis32 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.

Bills Medicare through one group practice

  1. Pratt Medical Group IncBoston, MA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Margaret Theresa O'Connor among 1,465 adult health nurse practitioner records in Massachusetts

Margaret Theresa O'Connor, APRN BC is one of 1,465 adult health nurse practitioner records with a practice address in Massachusetts. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 27% of them.

  • NPI issued2007 · 27% of these records are older, 56% newer
  • In a Medicare fileYes · 61% of these records are
  • In the CMS Doctors and Clinicians fileYes · 43% of these records are
  • Graduated1996 · median 2010 among the 634 with a school on file
  • Record last updated2011 · 73% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

454 adult health nurse practitioner records list a practice address in Boston

They are 454 of the 41,865 NPPES records with a practice address in Boston, and 1,465 adult health nurse practitioner records in Massachusetts.

All 1,465 in Massachusetts → Every provider in Boston → Adult Health Nurse Practitioner nationwide →

The 8 adult health nurse practitioner records with the nearest ZIP codes

  1. Maureen Abbott, NPBoston, MA 021111457591638
  2. Marianne Broderick, APRN BCBoston, MA 021111710195334
  3. Elene ChuiBoston, MA 021111063622520
  4. Judith Duffy, APRN BCBoston, MA 021111033327838
  5. Susan Greene-Hellman, APRN BCBoston, MA 021111417167479
  6. Diane Grogan, NPBoston, MA 021111043429582
  7. Lauren Keefe, N.P.Boston, MA 021111659527448
  8. Kathryn Pescatello, NPBoston, MA 021111205114675

Common questions

What is Margaret Theresa O'Connor, APRN BC's NPI number?

Margaret Theresa O'Connor, APRN BC's National Provider Identifier (NPI) is 1922216415, issued on May 18, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Margaret Theresa O'Connor, APRN BC located?

The NPPES record lists a practice address at 750 Washington Street, Boston, MA, 02111. Phone: (617) 636-7889. Providers update this record themselves, so call before visiting.

How can I verify Margaret Theresa O'Connor, APRN BC's license?

NPPES lists Massachusetts license number RN 155860 NP, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.

How much does Margaret Theresa O'Connor, APRN BC prescribe under Medicare Part D?

In 2024, Margaret Theresa O'Connor, APRN BC had 835 Medicare Part D claims for 219 beneficiaries; the average among adult health nurse practitioner prescribers was 1,280. 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.