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

Dr. Gregory Alan Gertsen, DDS

Individual provider Dentist · NPI 1427078351

Dr. Gregory Alan Gertsen, DDS is a Dentist in Watertown, South Dakota. Practices as a sole proprietor. Licensed in South Dakota.

Licensed in
SD
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.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1155 4th St NE
Watertown, SD 57201-1202
Phone: (605) 882-3060
Fax: (605) 882-0681
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dentist (primary) Taxonomy 122300000X · Licence M546 (SD)

Record details

NPI number1427078351
Entity typeIndividual (Type 1)
GenderMale
Credentials DDS
Sole proprietorYes
NPI enumeratedJuly 21, 2006
Last updated in NPPESJuly 8, 2007
Mailing address1155 4th St Ne, Watertown, SD 57201-1202

Other providers in Watertown