Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Thomas Leo Diana, PH.D.

Health Service Psychologist in Winona, MN · enumerated 2006 · practices at Home and Community Options, Inc..

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

National Provider Identifier

1093874281

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Thomas Leo Diana

Credential PH.D.

Sex Male

Practice address 66 E 3rd St, Winona, MN, 55987

Phone (507) 452-1021

Fax (507) 452-1504

Enumeration date Dec 6, 2006

Last updated in NPPES Jan 22, 2010

Taxonomy & licenses

103TH0100X Health Service Psychologist Behavioral Health & Social Service Providers · License LP1219 (MN) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
731291041000	Other	MN	PREFERRED ONE
126921	Other	MN	UCARE
200048200	Medicaid	MN	-
78G63DI	Other	MN	BCBS-MN
HP41036	Other	MN	HEALTHPARTNERS

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

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 Thomas Diana?

Thomas Diana is registered in NPPES with the primary taxonomy of Health Service Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

Browse all →

Dorothy Herzing Clinical Social Worker · Winona, MN NPI 1659432912 Daniel Konkel Professional Counselor · Winona, MN NPI 1710048350 Ruth Mathews Clinical Psychologist · Winona, MN NPI 1326100645 Diane Petz Clinical Psychologist · Winona, MN NPI 1003978024 Marcy Van Fossen Clinical Psychologist · Winona, MN NPI 1255483491 Home and Community Options, Inc. Community/Behavioral Health Agency · Winona, MN NPI 1851434401

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-01-22.