Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John R Clasen Jr., O.D.

Optometrist in Birmingham, AL · enumerated 2006.

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

National Provider Identifier

1780649707

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Registry record

Entity type Individual (Type 1)

Name Dr. John R Clasen Jr.

Credential O.D.

Sex Male

Practice address 840 Montclair Rd, Suite 722, Birmingham, AL, 35213

Phone (205) 591-2311

Fax (205) 592-3531

Enumeration date Apr 20, 2006

Last updated in NPPES Feb 24, 2017

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License S-839-TA-366 (AL) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
009911178	Medicaid	AL	-

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 John Clasen?

John Clasen is registered in NPPES with the primary taxonomy of Optometrist. 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 2017-02-24.