Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William N Gillum, M.D.

Specialist in Weslaco, TX · enumerated 2005.

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

National Provider Identifier

1952383978

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Registry record

Entity type Individual (Type 1)

Name Dr. William N Gillum

Credential M.D.

Sex Male

Practice address 1519 E 6th St, Weslaco, TX, 78596

Phone (956) 968-3171

Fax (956) 968-5783

Enumeration date Nov 16, 2005

Last updated in NPPES Feb 20, 2008

Taxonomy & licenses

174400000X Specialist Other Service Providers · License F5117 (TX) Primary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License F5117 (TX) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

What is the NPI number for William Gillum?

The National Provider Identifier (NPI) for William Gillum is 1952383978, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Gillum practice?

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

Other providers at this practice address

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Deborah Alexander Ophthalmology Physician · Weslaco, TX NPI 1306844097 Cassandra Cavazos-Salazar Optometrist · Weslaco, TX NPI 1639161391 Stephen Hook Specialist · Weslaco, TX NPI 1669454682 Rodolfo Perez Specialist · Weslaco, TX NPI 1548242274 Thurmond Eye Associates, Pllc Specialist · Weslaco, TX NPI 1629023460 Terry Taylor Optometrist · Weslaco, TX NPI 1245273747 Sonia Silva Optometrist · Weslaco, TX NPI 1861503054 Thurmond Eye Associates, Pllc Eyewear Supplier · Weslaco, TX NPI 1245326701

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-20.