Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Lloyd Mulchin, M.D.

Urology Physician in Plano, TX · enumerated 2006.

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

National Provider Identifier

1639126568

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Registry record

Entity type Individual (Type 1)

Name William Lloyd Mulchin

Credential M.D.

Sex Male

Practice address 3900 W 15th St, #408, Plano, TX, 75075

Phone (972) 867-3928

Fax (972) 596-4056

Enumeration date May 27, 2006

Last updated in NPPES Oct 17, 2007

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License F2346 (TX) Primary

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.

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Frequently asked questions

How do I verify William Mulchin's NPI record?

Cross-check NPI 1639126568 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1639126568 active?

Yes, as of the latest NPPES snapshot, NPI 1639126568 is active (record last updated 2007-10-17).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-17.