Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William David Ellis

Pharmacist in Harrisburg, PA · enumerated 2010.

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

National Provider Identifier

1003138504

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Registry record

Entity type Individual (Type 1)

Name Mr. William David Ellis

Sex Male

Practice address 6535 Grayson Rd, Harrisburg, PA, 17111

Phone (717) 561-2905

Enumeration date Feb 24, 2010

Last updated in NPPES Feb 24, 2010

Taxonomy & licenses

183500000X Pharmacist Pharmacy Service Providers · License 034064 (NY) Secondary

183500000X Pharmacist Pharmacy Service Providers · License RP033459R (PA) Primary

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

What is the NPI number for William Ellis?

The National Provider Identifier (NPI) for William Ellis is 1003138504, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Ellis practice?

The practice location on file with NPPES is in Harrisburg, PA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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National Vision, Inc. Optician · Harrisburg, PA NPI 1508803917 Wal-Mart Stores East Lp Community/Retail Pharmacy · Harrisburg, PA NPI 1689691735 Louis Verdelli Optometrist · Harrisburg, PA NPI 1922155548 Dr. Louis J Verdelli & Associates Optometrist · Harrisburg, PA NPI 1245366400 Alexis Jackson Pharmacist · Harrisburg, PA NPI 1750980280 Maureen Yetter Pharmacist · Harrisburg, PA NPI 1861095150 Wal-Mart Stores East, Lp. Optician · Harrisburg, PA NPI 1295502979

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-02-24.