Gregory P. Williams, DDS
Oral and Maxillofacial Surgery (Dentist) · Rapid City, SD
Gregory P. Williams, DDS is an oral and maxillofacial surgery (dentist) with a practice address in Rapid City, South Dakota, and NPI 1720126220, issued on Feb 5, 2007. Check the license (South Dakota M808, as entered in NPPES) with the South Dakota board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory P. Williams
- Credential
- DDS
- Primary taxonomy
- Oral and Maxillofacial Surgery (Dentist) 1223S0112X
- License number
- M808 SD
Self-reported in NPPES; status is on the state search - Practice location
- 330 E Stumer RD, Rapid City, SD 57701
- Phone
- (605) 348-3400
- Enumerated
- Feb 5, 2007
- Record last updated
- Jun 28, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (605) 348-1626
- Medicaid ID
- 8000390 SD
- Entity
- Type 1 · individual
8 nearest oral and maxillofacial surgery (dentist) records → All 20 in South Dakota → Look up another NPI →
Verify Gregory P. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich South Dakota board licenses this profession
Search for license M808Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
59% fewer Medicare Part D claims than the average oral and maxillofacial surgery (dentist) in 2024
167 Medicare Part D claims for 58 beneficiaries, against an average of 406 among the 5,870 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 42 claims were for opioids.
Most prescribed
- Amoxicillin43 claims
- Chlorhexidine Gluconate41 claims
- Hydrocodone-Acetaminophen37 claims
- Ibuprofen28 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 P. Williams among 20 oral and maxillofacial surgery (dentist) records in South Dakota
Gregory P. Williams, DDS is one of 20 oral and maxillofacial surgery (dentist) records with a practice address in South Dakota. 80% 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 50% of them.
- NPI issued2007 · 50% of these records are older, 25% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileNo · 15% of these records are
- Record last updated2016 · 80% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223S0112X and a South Dakota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Oral and Maxillofacial Surgery (Dentist) providers in South Dakota
There are 20 oral and maxillofacial surgery (dentist) records in South Dakota.
All 20 in South Dakota → Every provider in Rapid City → Oral and Maxillofacial Surgery (Dentist) nationwide →
The 8 oral and maxillofacial surgery (dentist) records with the nearest ZIP codes
- Cody Christensen, D.D.S.Rapid City, SD 577011205176401
- Jay Crossland, DDSRapid City, SD 577011558315838
- Isaac Morgan, DMDRapid City, SD 577011194972877
- Kenneth Vanasma, DDSPiedmont, SD 577691720116866
- Erick Rath, DDSPierre, SD 575011760576896
- Carl Kimbler, DMD MDAberdeen, SD 574011104984483
- Harvey Akerson, D.D.SSioux Falls, SD 571081649241407
- Louis George, D.D.SSioux Falls, SD 571081861692949
Common questions
What is Gregory P. Williams, DDS's NPI number?
Gregory P. Williams, DDS's National Provider Identifier (NPI) is 1720126220, issued on Feb 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gregory P. Williams, DDS located?
The NPPES record lists a practice address at 330 E Stumer RD, Rapid City, SD, 57701. Phone: (605) 348-3400. Providers update this record themselves, so call before visiting.
How can I verify Gregory P. Williams, DDS's license?
NPPES lists South Dakota license number M808, as entered by the provider. Search the South Dakota board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory P. Williams, DDS prescribe under Medicare Part D?
In 2024, Gregory P. Williams, DDS had 167 Medicare Part D claims for 58 beneficiaries; the average among oral and maxillofacial surgery (dentist) prescribers was 406. 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.