Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William John Flynn, M.D., O.D.

Ophthalmology Physician in San Antonio, TX · enumerated 2006.

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

National Provider Identifier

1700864089

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Registry record

Entity type Individual (Type 1)

Name Dr. William John Flynn

Credential M.D., O.D.

Sex Male

Practice address 5430 Fredericksburg Rd, Suite 100, San Antonio, TX, 78229

Phone (210) 340-1212

Fax (210) 525-9617

Enumeration date Jan 6, 2006

Last updated in NPPES Aug 25, 2020

Taxonomy & licenses

207WX0009X Glaucoma Specialist (Ophthalmology) Physician Allopathic & Osteopathic Physicians · License M0722 (TX) Secondary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License M0722 (TX) Primary

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

Other identifiers

Identifier	Type	State	Issuer
8M2751	Other	TX	BLUE CROSS BLUE SHIELD
181794202	Medicaid	TX	-
181794201	Medicaid	TX	-

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is William Flynn?

William Flynn is registered in NPPES with the primary taxonomy of Ophthalmology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-25.