Dr. Casey Benjamin Williams, PHARM.D., BCOP
Dr. Casey Benjamin Williams is a Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist provider (Pharmacist) practicing in Sioux Falls, SD, registered in the NPPES registry with NPI 1639172349 since 2005. The credential PHARMD stands for Doctor of Pharmacy.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1639172349 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Casey Benjamin Williams |
| Credential | PHARM.D., BCOP |
| Sex | Male |
| Practice address | 1000 E 23RD ST, SUITE 200, Sioux Falls, SD, 57105 |
| Phone | 6053223588 |
| Fax | 6053226901 |
| Enumeration date | 2005-05-27 |
| Last updated in NPPES | 2016-09-02 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 1835P0018X | Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist | Primary | R5920 | SD |
| 1835P0018X | Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist | Secondary | RPH5472 | ND |
| 1835P1200X | Pharmacotherapy Pharmacist | Secondary | 1-13848 | KS |
| 1835P1200X | Pharmacotherapy Pharmacist | Secondary | 15481 | NC |
| 1835X0200X | Oncology Pharmacist | Secondary | 15481 | NC |
| 1835X0200X | Oncology Pharmacist | Secondary | 1-13848 | KS |
PHARMD — Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy. About the PHARMD credential
Copy-ready billing details
Provider: Casey Williams, PHARM.D., BCOP NPI: 1639172349 Taxonomy: 1835P0018X (Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist) Address: 1000 E 23RD ST, SUITE 200, Sioux Falls, SD, 57105
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1760484570 | James Simon | Individual | Radiation Oncology Physician | Sioux Falls, SD |
| 1124017256 | Michael Mchale | Individual | Hematology & Oncology Physician | Sioux Falls, SD |
| 1598755001 | Sally Williams | Individual | Family Medicine Physician | Sioux Falls, SD |
| 1992771760 | Melissa Hoogeveen | Individual | Nurse Practitioner | Sioux Falls, SD |
| 1750357299 | Mark Huber | Individual | Hematology & Oncology Physician | Sioux Falls, SD |
| 1467428995 | David Elson | Individual | Medical Oncology Physician | Sioux Falls, SD |
| 1063488310 | Kristen Hurley | Individual | Family Nurse Practitioner | Sioux Falls, SD |
| 1295701522 | Kelly Mccaul | Individual | Hematology & Oncology Physician | Sioux Falls, SD |
Verify this record
Cross-check NPI 1639172349 against the authoritative CMS record: view Dr. Casey Benjamin 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 2016-09-02.