Gregory Williams Diedrich, DMD
General Practice Dentistry · Mishawaka, IN
Gregory Williams Diedrich, DMD is a general practice dentistry with a practice address in Mishawaka, Indiana, and NPI 1467977405, issued on Aug 10, 2017. Check the license (Indiana 12012784A., as entered in NPPES) with the Indiana board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory Williams Diedrich
- Credential
- DMD
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- 12012784A. IN
Self-reported in NPPES; status is on the state search - Practice location
- 605 W Douglas RD, Mishawaka, IN 46545
- Phone
- (574) 277-2220
- Enumerated
- Aug 10, 2017
- Record last updated
- Aug 10, 2017 (not updated in 9 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 2,066 in Indiana → Look up another NPI →
Also registered at 605 W Douglas RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Grant Cleveland, DDSGeneral Practice Dentistry1255523023
- Richard Dziak, D.D.S.Dentist1902958036
- John Luczak, D.M.D.Dentist1518319011
- Ezzat Makawi, DDSGeneral Practice Dentistry1528750585
- Michelle Paden, D.D.S., M.S.Orthodontics and Dentofacial Orthopedics Dentistry1124135371
- Parker Pecina, DMDGeneral Practice Dentistry1588426043
Verify Gregory Williams Diedrich in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Indiana board licenses this profession
Search for license 12012784A.Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% more Medicare Part D claims than the average general practice dentistry in 2024
96 Medicare Part D claims for 68 beneficiaries, against an average of 83 among the 70,290 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Penicillin V Potassium39 claims
- Clindamycin Hcl19 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 Williams Diedrich among 2,066 general practice dentistry records in Indiana
Gregory Williams Diedrich, DMD is one of 2,066 general practice dentistry records with a practice address in Indiana. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 79% of them.
- NPI issued2017 · 79% of these records are older, 19% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2017 · 75% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223G0001X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 general practice dentistry records list a practice address in Mishawaka
They are 25 of the 1,454 NPPES records with a practice address in Mishawaka, and 2,066 general practice dentistry records in Indiana.
All 2,066 in Indiana → Every provider in Mishawaka → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Hari Priya Anne, DDSMishawaka, IN 465451144696410
- Matthew Brennan, D.D.S.Mishawaka, IN 465451730333097
- Grant Cleveland, DDSMishawaka, IN 465451255523023
- Terry Cunningham, DDSMishawaka, IN 465451922218858
- Deborah Fleming, D.M.D.Mishawaka, IN 465451295892610
- Michael Gasko, D.D.S.Mishawaka, IN 465451407921927
- Russell Griffing, D.M.D.Mishawaka, IN 465451215092846
- George Guerrant, D.M.D.Mishawaka, IN 465451366588360
Common questions
What is Gregory Williams Diedrich, DMD's NPI number?
Gregory Williams Diedrich, DMD's National Provider Identifier (NPI) is 1467977405, issued on Aug 10, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Williams Diedrich, DMD located?
The NPPES record lists a practice address at 605 W Douglas RD, Mishawaka, IN, 46545. Phone: (574) 277-2220. Providers update this record themselves, so call before visiting.
How can I verify Gregory Williams Diedrich, DMD's license?
NPPES lists Indiana license number 12012784A., as entered by the provider. Search the Indiana board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory Williams Diedrich, DMD prescribe under Medicare Part D?
In 2024, Gregory Williams Diedrich, DMD had 96 Medicare Part D claims for 68 beneficiaries; the average among general practice dentistry prescribers was 83. 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.
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.