Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Diana L Theiss Phd

Clinical Social Worker in Sylvania, OH · enumerated 2017 · authorized official Diana Theiss, Practice Owner.

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

National Provider Identifier

1396250338

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Registry record

Entity type Organization (Type 2)

Legal business name Diana L Theiss Phd

Other name <Unavail>

Practice address 5800 Monroe St Ste A1, Sylvania, OH, 43560

Phone (419) 517-7073

Fax (419) 517-0122

Enumeration date Dec 13, 2017

Last updated in NPPES Mar 2, 2023

Taxonomy & classification

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License I0900183-SUPV (OH) Primary

Authorized official

Name Diana Theiss

Title Practice Owner

Phone (419) 843-5945

Other identifiers

Identifier	Type	State	Issuer
0155198	Medicaid	OH	-

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

Where is Diana L Theiss Phd located?

The practice location on file with NPPES is in Sylvania, OH.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-03-02. Verify at npiregistry.cms.hhs.gov.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-02.