Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Elizabeth Baker Diener, O.D.

Optometrist in Reading, PA · enumerated 2007.

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

National Provider Identifier

1265651194

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Elizabeth Baker Diener

Credential O.D.

Sex Female

Practice address 838 Penn St, Reading, PA, 19602

Phone (610) 988-4838

Enumeration date Apr 25, 2007

Last updated in NPPES Oct 18, 2021

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OEG001061 (PA) 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
018810340001	Medicaid	PA	-

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 specialty is Elizabeth Diener?

Elizabeth Diener 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.

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.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-10-18.