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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

JOHN SIEGERT M.D.
NPI 1013989185
Orthopaedic Surgery - Hand Surgery in Mequon, WI

Active since February 03, 2006
12300 N PORT WASHINGTON RD, MEQUON, WI 53092(262) 243-5400(262) 243-6005 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About John Siegert M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN SIEGERT M.D. (NPI 1013989185) is an individual hand surgery provider in Mequon, Wisconsin, licensed in Wisconsin (29031) and active in the NPI registry since February 2006.

NPPES Registry Identity

NPI1013989185
Entity TypeIndividualMale
Primary Taxonomy207XS0106X
Provider Legal NameJOHN SIEGERTCredential: M.D.
Location Address12300 N PORT WASHINGTON RDMequon, WI 53092-3339
Mailing Address12300 N Port Washington RdMequon, WI 53092-3339
Phone(262) 243-5400
Fax(262) 243-6005
Sole ProprietorNo
Enumeration DateFebruary 3, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1013989185 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOrthopaedic Surgery · Hand SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207XS0106X
License✔ Licensed in WI · 29031
Definition
An orthopaedic surgeon trained in the investigation, preservation and restoration by medical, surgical and rehabilitative means of all structures of the upper extremity directly affecting the form and function of the hand and wrist.
12300 N PORT WASHINGTON RD, Mequon, WI 53092
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Other Identifiers 1

Medicaid31499800WI

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

THERESA SIEGERT M.D.
Surgery (Surgery of the Hand)
12300 N PORT WASHINGTON RD
MEQUON, WI 53092
Ozaukee County (262) 243-5400
HAND DOCTORS OF MILWAUKEE, S.C.
Clinic/Center (Medical Specialty)
12300 N PORT WASHINGTON RD
MEQUON, WI 53092
Ozaukee County (262) 243-5400

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Siegert's NPI number?

The NPI number for John Siegert is 1013989185. It was assigned to this individual provider in the NPPES registry on February 3, 2006.

Where is John Siegert located?

John Siegert practices at 12300 N Port Washington Rd, Mequon, WI 53092. The listed phone number is (262) 243-5400.

What is John Siegert's specialty?

The primary specialty registered for this NPI is Orthopaedic Surgery, specializing in Hand Surgery, with taxonomy code 207XS0106X.

When was this NPI record last updated?

The NPPES record for John Siegert was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.