NPPES file of Aug 9, 2026

Jacek M. Kowalski, M.D.

Gynecology Physician · West Allis, WI

Jacek M. Kowalski, M.D. is a gynecology physician with a practice address in West Allis, Wisconsin, and NPI 1679653786, issued on Oct 16, 2006. Check the license (Wisconsin 27255, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1679653786
Name
Jacek M. Kowalski
Credential
M.D.
Primary taxonomy
Gynecology Physician 207VG0400X
License number
27255 WI
Self-reported in NPPES; status is on the state search
Practice location
8905 W Lincoln Ave, West Allis, WI 53227
Phone
(414) 978-2229
Enumerated
Oct 16, 2006
Record last updated
Apr 15, 2025
Fax
(414) 978-2279
Medicaid ID
31403800 WI
Medicare enrollment
Enrolled (PECOS I20080605000339); accepts Medicare assignment
Medical or professional school
Medical College Of Wisconsin, 1981
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
Download card Updates feed

Also registered at 8905 W Lincoln Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Tracy Capes, M.D.Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician1740448828
  2. Douglas Carlson, MDObstetrics & Gynecology Physician1336294438
  3. Jamie Chao, MDUrogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician1811156185
  4. Jennifer Comp, RNAmbulatory Women's Health Care Registered Nurse1538251038
  5. Cathleen Conway Johnson, CNMAdvanced Practice Midwife1982877247
  6. Susan Darmstadter, M.D.Pulmonary Disease Physician1134191661

Verify Jacek M. Kowalski in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 27255    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Wisconsin license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

34% fewer Medicare Part D claims than the average gynecology physician in 2024

197 Medicare Part D claims for 57 beneficiaries, against an average of 299 among the 1,919 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims.

  1. Jacek Kowalski197
  2. Specialty average299

Most prescribed

  1. Estradiol61 claims
  2. Fluconazole33 claims
  3. Clobetasol Propionate16 claims
  4. Clotrimazole-Betamethasone15 claims
  5. Valacyclovir15 claims
  6. Yuvafem12 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

  1. Aurora Advanced Healthcare, Inc.West Allis, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Gynecology Physician providers in Wisconsin

There are 32 gynecology physician records in Wisconsin.

All 32 in Wisconsin → Every provider in West Allis →

Other gynecology physician records in Wisconsin

  1. Donald Baccus, M.D.Brookfield, WI1538152962
  2. Ik Bae, M.D.Eau Claire, WI1669703195
  3. Dennis Christensen, MDMadison, WI1841368206
  4. Klaus Diem, MDVerona, WI1083680151
  5. Patricia Dolhun, M.D.Milwaukee, WI1457305005
  6. Olga Fajardo, MDMadison, WI1730619693
  7. Gerald Fleer, MDRichland Center, WI1700946761
  8. Stuart Fox, M.D.Racine, WI1366472235
  9. Jenny Hackforth-Jones, M.D.Madison, WI1861454647
  10. Rodney Halvorsen, M.D.Kenosha, WI1649388802

Common questions

What is Jacek M. Kowalski, M.D.'s NPI number?

Jacek M. Kowalski, M.D.'s National Provider Identifier (NPI) is 1679653786, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Jacek M. Kowalski, M.D. located?

The NPPES record lists a practice address at 8905 W Lincoln Ave, West Allis, WI, 53227. Phone: (414) 978-2229. Providers update this record themselves, so call before visiting.

How can I verify Jacek M. Kowalski, M.D.'s license?

NPPES lists Wisconsin license number 27255, 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 Jacek M. Kowalski, M.D. prescribe under Medicare Part D?

In 2024, Jacek M. Kowalski, M.D. had 197 Medicare Part D claims for 57 beneficiaries; the average among gynecology physician prescribers was 299. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.