Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Casey Benjamin Williams, PHARM.D., BCOP

Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in Sioux Falls, SD · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1639172349

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Registry record

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 (605) 322-3588

Fax (605) 322-6901

Enumeration date May 27, 2005

Last updated in NPPES Sep 2, 2016

Taxonomy & licenses

1835P0018X Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist Pharmacy Service Providers · License R5920 (SD) Primary

1835P0018X Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist Pharmacy Service Providers · License RPH5472 (ND) Secondary

1835P1200X Pharmacotherapy Pharmacist Pharmacy Service Providers · License 1-13848 (KS) Secondary

1835P1200X Pharmacotherapy Pharmacist Pharmacy Service Providers · License 15481 (NC) Secondary

1835X0200X Oncology Pharmacist Pharmacy Service Providers · License 15481 (NC) Secondary

1835X0200X Oncology Pharmacist Pharmacy Service Providers · License 1-13848 (KS) Secondary

PHARMD · Doctor of Pharmacy: A licensed pharmacist with a professional doctorate in pharmacy. About the PHARMD credential

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 → Validate an NPI →

Frequently asked questions

Is NPI 1639172349 active?

Yes, as of the latest NPPES snapshot, NPI 1639172349 is active (record last updated 2016-09-02).

How do I verify Casey Williams's NPI record?

Cross-check NPI 1639172349 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-09-02.