NPPES file of Aug 9, 2026

Gregory James Nielsen, D.D.S.

Endodontics · Billings, MT

Gregory James Nielsen, D.D.S. is an endodontics with a practice address in Billings, Montana, and NPI 1578600318, issued on Jan 31, 2007. Check the license (Montana 11499, as entered in NPPES) with the Montana board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1578600318
Name
Gregory James Nielsen
Credential
D.D.S.
Primary taxonomy
Endodontics 1223E0200X
License numbers
11499 MT
8806 CO
4702 NV
Self-reported in NPPES; status is on the state search
Practice location
2225 Broadwater Ave Ste A, Billings, MT 59102
Phone
(702) 869-2800
Enumerated
Jan 31, 2007
Record last updated
Jul 21, 2022
Fax
(702) 869-2803
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest endodontics records → All 19 in Montana → Look up another NPI →

Verify Gregory James Nielsen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Montana board licenses this profession
    Search for license 11499    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Montana license search

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43% fewer Medicare Part D claims than the average endodontics in 2024

69 Medicare Part D claims for 41 beneficiaries, against an average of 121 among the 4,119 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.

  1. Gregory Nielsen69
  2. Specialty average121

Most prescribed

  1. Amoxicillin25 claims
  2. Dexamethasone19 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Gregory James Nielsen among 19 endodontics records in Montana

Gregory James Nielsen, D.D.S. is one of 19 endodontics records with a practice address in Montana. 63% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 21% of them.

  • NPI issued2007 · 21% of these records are older, 37% newer
  • In a Medicare fileYes · 63% of these records are
  • In the CMS Doctors and Clinicians fileNo · 0% of these records are
  • Record last updated2022 · 79% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223E0200X and a Montana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Endodontics providers in Montana

There are 19 endodontics records in Montana.

All 19 in Montana → Every provider in Billings → Endodontics nationwide →

The 8 endodontics records with the nearest ZIP codes

  1. Jeffrey Beacham, D.M.DBillings, MT 591021154617389
  2. Wayne Hansen, DDSBillings, MT 591021447468145
  3. Michael StevensBillings, MT 591021528120771
  4. Cameron Townsend, DDS, MSBillings, MT 591021598852188
  5. Nathan Brown, DMDGreat Falls, MT 594051265816177
  6. Brett Bruggeman, DDSGreat Falls, MT 594051841332939
  7. Phillip Lybbert, D.M.D.Helena, MT 596011942354006
  8. Julie StrongButte, MT 597011790184828

Common questions

What is Gregory James Nielsen, D.D.S.'s NPI number?

Gregory James Nielsen, D.D.S.'s National Provider Identifier (NPI) is 1578600318, issued on Jan 31, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Gregory James Nielsen, D.D.S. located?

The NPPES record lists a practice address at 2225 Broadwater Ave Ste A, Billings, MT, 59102. Phone: (702) 869-2800. Providers update this record themselves, so call before visiting.

How can I verify Gregory James Nielsen, D.D.S.'s license?

NPPES lists Montana license number 11499, as entered by the provider. Search the Montana board that licenses this profession; the NPPES record confirms identity only.

How much does Gregory James Nielsen, D.D.S. prescribe under Medicare Part D?

In 2024, Gregory James Nielsen, D.D.S. had 69 Medicare Part D claims for 41 beneficiaries; the average among endodontics prescribers was 121. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.