Margaret Mary O'Connor, GNP-BC
Gerontology Nurse Practitioner · Saint Helena, CA
Margaret Mary O'Connor, GNP-BC is a gerontology nurse practitioner with a practice address in Saint Helena, California, and NPI 1538202452, issued on Feb 14, 2007. Check the license (California 95031336, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Margaret Mary O'Connor
- Credential
- GNP-BC
- Primary taxonomy
- Gerontology Nurse Practitioner 363LG0600X
- License numbers
- 95031336 CA
APRN3104612 FL
ARNP3104612 FL
Self-reported in NPPES; status is on the state search - Practice location
- 6 Woodland RD Ste 101, Saint Helena, CA 94574
- Phone
- (707) 963-7028
- Enumerated
- Feb 14, 2007
- Record last updated
- May 4, 2026
- Fax
- (707) 963-7255
- Medicaid ID
- 308810300 FL
- Medicare enrollment
- Enrolled (PECOS I20241004001748); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gerontology nurse practitioner records → All 569 in California → Look up another NPI →
Also registered at 6 Woodland RD Ste 101
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Terrie Anne Gutierrez, RNRegistered Nurse1417680596
- Juan Vasquez, MDSurgery Physician1477593713
Verify Margaret Mary O'Connor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 95031336Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average gerontology nurse practitioner in 2024
242 Medicare Part D claims for 138 beneficiaries, against an average of 1,369 among the 6,165 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Donepezil Hcl77 claims
- Memantine Hcl58 claims
- Sod Sulf-Potass Sulf-Mag Sulf45 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
- Adventist Health Physicians NetworkCalistoga, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Margaret Mary O'Connor among 569 gerontology nurse practitioner records in California
Margaret Mary O'Connor, GNP-BC is one of 569 gerontology nurse practitioner records with a practice address in California. 64% 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 15% of them.
- NPI issued2007 · 15% of these records are older, 80% newer
- In a Medicare fileYes · 64% of these records are
- In the CMS Doctors and Clinicians fileYes · 42% of these records are
- Graduated2006 · median 2018 among the 239 with a school on file
- Record last updated2026 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LG0600X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gerontology Nurse Practitioner providers in California
There are 569 gerontology nurse practitioner records in California.
All 569 in California → Every provider in Saint Helena → Gerontology Nurse Practitioner nationwide →
The 8 gerontology nurse practitioner records with the nearest ZIP codes
- Sharon Matthews, N.P.San Leandro, CA 945771508930389
- Susan Sequeira, N.P.San Leandro, CA 945771417015355
- Sachi RichardsonSan Ramon, CA 945831376224857
- Patricia Bruketta, NPUnion City, CA 945871699841155
- Margaret Wahl, RN,Vallejo, CA 945891881795573
- Kathleen Kinda, NURSE PRACTITIONERNapa, CA 945581962039537
- Nancy Trego, GNP-CNapa, CA 945581528150539
- Sunayna Kumar, NPWalnut Creek, CA 945951619342086
Common questions
What is Margaret Mary O'Connor, GNP-BC's NPI number?
Margaret Mary O'Connor, GNP-BC's National Provider Identifier (NPI) is 1538202452, issued on Feb 14, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Mary O'Connor, GNP-BC located?
The NPPES record lists a practice address at 6 Woodland RD Ste 101, Saint Helena, CA, 94574. Phone: (707) 963-7028. Providers update this record themselves, so call before visiting.
How can I verify Margaret Mary O'Connor, GNP-BC's license?
NPPES lists California license number 95031336, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Margaret Mary O'Connor, GNP-BC prescribe under Medicare Part D?
In 2024, Margaret Mary O'Connor, GNP-BC had 242 Medicare Part D claims for 138 beneficiaries; the average among gerontology nurse practitioner prescribers was 1,369. 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.