Mary Oconnor
Internal Medicine Physician · Seattle, WA
Mary Oconnor is an internal medicine physician with a practice address in Seattle, Washington, and NPI 1700840691, issued on Apr 17, 2006. Check the license (Washington 28887, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Mary Oconnor
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 28887 WA
Self-reported in NPPES; status is on the state search - Practice location
- 3901 Hoyt Ave, Seattle, WA 98201
- Phone
- (425) 259-0966
- Enumerated
- Apr 17, 2006
- Record last updated
- May 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100216000088); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 1987
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Verify Mary Oconnor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license 28887Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Neighborcare HealthSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Oconnor among 3,079 internal medicine physician records in Washington
Mary Oconnor is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1987 · median 2006 among the 1,852 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 Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
821 internal medicine physician records list a practice address in Seattle
They are 821 of the 41,956 NPPES records with a practice address in Seattle, and 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Seattle → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Irene Altmann, MDEverett, WA 982011073588232
- Jennifer Battaglia, M.D.Everett, WA 982011235117367
- John Dilworth, MDEverett, WA 982011720042856
- Sheryl Dreyer, MDEverett, WA 982011144298043
- Shelly FinnEverett, WA 982011184688210
- Todd Gunderson, MDEverett, WA 982011669436176
- Michael Jenks, MDEverett, WA 982011477521185
- Tul Kalayanamit, MDEverett, WA 982011932171527
Common questions
What is Mary Oconnor's NPI number?
Mary Oconnor's National Provider Identifier (NPI) is 1700840691, issued on Apr 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Oconnor located?
The NPPES record lists a practice address at 3901 Hoyt Ave, Seattle, WA, 98201. Phone: (425) 259-0966. Providers update this record themselves, so call before visiting.
How can I verify Mary Oconnor's license?
NPPES lists Washington license number 28887, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
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.