Kathryn J. Kostic, MD
Obstetrics & Gynecology Physician · Mequon, WI
Kathryn J. Kostic, MD is an obstetrics & gynecology physician with a practice address in Mequon, Wisconsin, and NPI 1982635397, issued on Jul 5, 2006. Check the license (Wisconsin 39904, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Kathryn J. Kostic
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 39904 WI
Self-reported in NPPES; status is on the state search - Practice location
- 12203 N Corporate Pkwy, Mequon, WI 53092
- Phone
- (262) 387-8200
- Enumerated
- Jul 5, 2006
- Record last updated
- Sep 2, 2025
- Medicaid ID
- 32456300 WI
- Medicare enrollment
- Enrolled (PECOS I20060119000841); accepts Medicare assignment
- Medical or professional school
- Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, 1993
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 796 in Wisconsin → Look up another NPI →
Also registered at 12203 N Corporate Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Edward Hurtte, MDGastroenterology Physician1699336446
- Luke Rehrauer, MDInternal Medicine Physician1124050364
- Margaret Spoerl, MDInternal Medicine Physician1871511519
Verify Kathryn J. Kostic in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 39904Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
25% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
123 Medicare Part D claims for 35 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 20% of claims.
Most prescribed
- Progesterone25 claims
- Estradiol15 claims
- Premarin11 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
- Aurora Advanced Healthcare, Inc.Mequon, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kathryn J. Kostic among 796 obstetrics & gynecology physician records in Wisconsin
Kathryn J. Kostic, MD is one of 796 obstetrics & gynecology physician records with a practice address in Wisconsin. 71% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 47% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1993 · median 2007 among the 478 with a school on file
- Record last updated2025 · 48% 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 Wisconsin 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 Wisconsin
There are 796 obstetrics & gynecology physician records in Wisconsin.
All 796 in Wisconsin → Every provider in Mequon → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Barbara Rain, MDMeyvon, WI 530921770513467
- Deirdre Duffy, M.D.Watertown, WI 530941962475426
- Roxanna AldstadtWest Bend, WI 530951457431819
- Irene Bozich, M.D.West Bend, WI 530951790084002
- Scott Donovan, MDWest Bend, WI 530951467494633
- Janet Goldman, MDWest Bend, WI 530951063438109
- Elissa Hellman, MDWest Bend, WI 530951205072287
- Anne Lipinski, MDWest Bend, WI 530951154354280
Common questions
What is Kathryn J. Kostic, MD's NPI number?
Kathryn J. Kostic, MD's National Provider Identifier (NPI) is 1982635397, issued on Jul 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Kathryn J. Kostic, MD located?
The NPPES record lists a practice address at 12203 N Corporate Pkwy, Mequon, WI, 53092. Phone: (262) 387-8200. Providers update this record themselves, so call before visiting.
How can I verify Kathryn J. Kostic, MD's license?
NPPES lists Wisconsin license number 39904, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Kathryn J. Kostic, MD prescribe under Medicare Part D?
In 2024, Kathryn J. Kostic, MD had 123 Medicare Part D claims for 35 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.