Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

John D Siekmann, DDS

Individual provider Dentist · NPI 1336240191

John D Siekmann, DDS is a Dentist in Gurnee, Illinois. Licensed in Illinois. Registered with an NPI since 2006.

Licensed in
IL
In the registry since
2006
What do these letters mean?
DDS — Doctor of Dental Surgery
A dentist. DDS and DMD are the same qualification — universities choose which title to award.

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Practice location Address checks out

101 S Greenleaf St Ste E
Gurnee, IL 60031-3369
Phone: (847) 662-3100
Fax: (847) 662-3125
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dentist (primary) Taxonomy 122300000X (IL)

Record details

NPI number1336240191
Entity typeIndividual (Type 1)
GenderMale
Credentials DDS
Sole proprietorNo
NPI enumeratedSeptember 26, 2006
Last updated in NPPESJuly 8, 2007
Mailing address101 S Greenleaf St, Suite E, Gurnee, IL 60031-3369

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