Dr. Gregory P Williams, DDS
Dr. Gregory P Williams is a Oral and Maxillofacial Surgery (Dentist) provider (Dentist) practicing in Rapid City, SD, registered in the NPPES registry with NPI 1720126220 since 2007. The credential DDS stands for Doctor of Dental Surgery.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1720126220 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Gregory P Williams |
| Credential | DDS |
| Sex | Male |
| Practice address | Rapid City, SD, 57701 |
| Phone | 6053483400 |
| Fax | 6053481626 |
| Enumeration date | 2007-02-05 |
| Last updated in NPPES | 2016-06-28 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 1223S0112X | Oral and Maxillofacial Surgery (Dentist) | Primary | M808 | SD |
DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 8000390 | Medicaid | SD | — |
Copy-ready billing details
Provider: Gregory Williams, DDS NPI: 1720126220 Taxonomy: 1223S0112X (Oral and Maxillofacial Surgery (Dentist)) Address: Rapid City, SD, 57701
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1659543973 | Williams Oral and Maxillofacial Surgery | Organization | Oral and Maxillofacial Surgery Clinic/Center | Rapid City, SD |
| 1407091424 | Williams Oral and Maxillofacial Surgery, Prof. L.L.C. | Organization | Oral and Maxillofacial Surgery (Dentist) | Rapid City, SD |
| 1982384483 | Rapid City Oral Surgery Prof LLC | Organization | Oral & Maxillofacial Surgery (D.M.D.) | Rapid City, SD |
Verify this record
Cross-check NPI 1720126220 against the authoritative CMS record: view Dr. Gregory P Williams on the official NPPES registry .
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes — even if the provider moves or changes specialty. Read the full guide or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2016-06-28.