Mark J. Korkowski, MD
Obstetrics & Gynecology Physician · San Jose, CA
Mark J. Korkowski, MD is an obstetrics & gynecology physician with a practice address in San Jose, California, and NPI 1164572962, issued on Jan 12, 2007. Check the license (California G77926, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark J. Korkowski
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- G77926 CA
Self-reported in NPPES; status is on the state search - Practice location
- 260 International Cir, San Jose, CA 95119
- Phone
- (408) 972-7000
- Enumerated
- Jan 12, 2007
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G779260 CA
- Medicare enrollment
- Enrolled (PECOS I20101217000529); accepts Medicare assignment
- Medical or professional school
- Medical College Of Ohio, 1989
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 5,088 in California → Look up another NPI →
Also registered at 260 International Cir
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Patti Albertson, MDObstetrics & Gynecology Physician1952487456
- Catherine Allen, N.P.Obstetrics & Gynecology Nurse Practitioner1487746772
- Thomas Alloggiamento, MDCardiovascular Disease Physician1881770386
Verify Mark J. Korkowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G77926Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
162 Medicare Part D claims for 70 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Estradiol34 claims
- Fluconazole12 claims
- Norethindrone Acetate12 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
- Permanente Medical Group IncSanta Clara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark J. Korkowski among 5,088 obstetrics & gynecology physician records in California
Mark J. Korkowski, MD 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 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 38% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1989 · median 2004 among the 2,700 with a school on file
- Record last updated2021 · 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 San Jose → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Patti Albertson, MDSan Jose, CA 951191952487456
- Akila Annamalai, MDSan Jose, CA 951191497831903
- Preete Bhanot, MDSan Jose, CA 951191215013719
- Joseph Derrough, MDSan Jose, CA 951191225114747
- Karen Garcia, MDSan Jose, CA 951191043396567
- Dennis Hou, MDSan Jose, CA 951191245316751
- Thomas Lin, MDSan Jose, CA 951191023194552
- Suchada Nopachai, MDSan Jose, CA 951191699851105
Common questions
What is Mark J. Korkowski, MD's NPI number?
Mark J. Korkowski, MD's National Provider Identifier (NPI) is 1164572962, issued on Jan 12, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Mark J. Korkowski, MD located?
The NPPES record lists a practice address at 260 International Cir, San Jose, CA, 95119. Phone: (408) 972-7000. Providers update this record themselves, so call before visiting.
How can I verify Mark J. Korkowski, MD's license?
NPPES lists California license number G77926, 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 Mark J. Korkowski, MD prescribe under Medicare Part D?
In 2024, Mark J. Korkowski, MD had 162 Medicare Part D claims for 70 beneficiaries; 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.