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

Dr. Gregory James Nielsen, DDS

Individual provider Endodontics · NPI 1578600318

Dr. Gregory James Nielsen, DDS is an Endodontics in Billings, Montana. Licensed in Colorado, Montana and Nevada. Registered with an NPI since 2007.

Licensed in
CO, MT, NV
In the registry since
2007
Specialties on file
4
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

2225 Broadwater Ave Ste A
Billings, MT 59102-4707
Phone: (702) 869-2800
Fax: (702) 869-2803
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Specialties & licences

Endodontics (primary) Taxonomy 1223E0200X · Licence 8806 (CO)
Endodontics Taxonomy 1223E0200X · Licence 11499 (MT)
General Practice Dentistry Taxonomy 1223G0001X · Licence 4702 (NV)
General Practice Dentistry Taxonomy 1223G0001X · Licence 8806 (CO)

Record details

NPI number1578600318
Entity typeIndividual (Type 1)
GenderMale
Credentials DDS
Sole proprietorNo
NPI enumeratedJanuary 31, 2007
Last updated in NPPESJuly 21, 2022
Mailing address4194 Bainbridge Cir, Billings, MT 59106-2421

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