Madeline McCosker
Obstetrics & Gynecology Physician · Oakland, CA
Madeline McCosker is an obstetrics & gynecology physician with a practice address in Oakland, California, and NPI 1568956787, issued on Jun 20, 2018. Check the license (California 191154, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Madeline McCosker
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 191154 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1411 E 31St St, Oakland, CA 94602
- Phone
- (510) 437-6478
- Enumerated
- Jun 20, 2018
- Record last updated
- Feb 19, 2025
- Medicare enrollment
- Enrolled (PECOS I20241002001808); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2020
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 1411 E 31St St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Madeline McCosker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 191154Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
12 Medicare Part D claims, against an average of 165 among the 28,733 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.
Bills Medicare through one group practice
- Alameda Health SystemNewark, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Madeline McCosker among 5,088 obstetrics & gynecology physician records in California
Madeline McCosker is one of 5,088 obstetrics & gynecology physician records with a practice address in California. 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 2018, is newer than 90% of them.
- NPI issued2018 · 90% of these records are older, 8% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2020 · median 2004 among the 2,700 with a school on file
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in California
There are 5,088 obstetrics & gynecology physician records in California.
All 5,088 in California → Every provider in Oakland → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Jessica Beckerman, MDOakland, CA 946021992123962
- Johara Chapman, MDOakland, CA 946021447260021
- Teresa Diaz, MDOakland, CA 946021194735753
- Bonnie Flemming, MDOakland, CA 946021356351936
- Phillip Gorrindo, M.D., PH.D.Oakland, CA 946021831517937
- Leia Harbour, MDOakland, CA 946021942620919
- Stephanie HoOakland, CA 946021124406608
- Frazier Hubbard, MDOakland, CA 946021891705489
Common questions
What is Madeline McCosker's NPI number?
Madeline McCosker's National Provider Identifier (NPI) is 1568956787, issued on Jun 20, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Madeline McCosker located?
The NPPES record lists a practice address at 1411 E 31St St, Oakland, CA, 94602. Phone: (510) 437-6478. Providers update this record themselves, so call before visiting.
How can I verify Madeline McCosker's license?
NPPES lists California license number 191154, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Madeline McCosker prescribe under Medicare Part D?
In 2024, Madeline McCosker had 12 Medicare Part D claims; the average among obstetrics & gynecology physician prescribers was 165. 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.