Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Gerilyn Olsen, MD

Individual provider Dermatology Physician · NPI 1538746847

Gerilyn Olsen, MD practises Dermatology in Brookfield, Wisconsin. Graduated from Medical College of Wisconsin in 2021, 5 years ago. Practices with Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc, a 1,676-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
5
Trained at
Medical College of Wisconsin
Licensed in
WI
In the registry since
2021
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

13800 W North Ave Ste 100
Brookfield, WI 53005-4977
Phone: (262) 754-4488
Fax: (262) 754-4940
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 10050 S 27th St Ste 200, Oak Creek, WI 53154-5522 — (262) 754-4488

Specialties & licences

Dermatology Physician (primary) Taxonomy 207N00000X · Licence 1021464 (WI)

Record details

NPI number1538746847
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 24, 2021
Last updated in NPPESSeptember 16, 2026
Certification dateSeptember 16, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyDERMATOLOGY
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 2021 (5 years in practice)
Group practice Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc — 1676 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 108 times · 76th percentile
Skin biopsy 92 times · 75th percentile
Melanoma (skin cancer) excision 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1676 clinicians in the practice; 12 are shown here.

Other providers in Brookfield