Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Diana M. Greg, Ph.D, Inc.

Q: What type of organization is Diana M. Greg, Ph.D, Inc.?

Diana M. Greg, Ph.D, Inc. is registered in NPPES as a Marriage & Family Therapist (its primary provider taxonomy).

Marriage & Family Therapist in La Jolla, CA · enumerated 2007 · authorized official Diana Greg, President.

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

National Provider Identifier

1831304229

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Registry record

Entity type Organization (Type 2)

Legal business name Diana M. Greg, Ph.D, Inc.

Practice address 8950 Villa La Jolla Dr, Suite B208, La Jolla, CA, 92037

Phone (858) 552-1559

Fax (858) 552-1502

Enumeration date May 11, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 18346 (CA) Primary

Authorized official

Name Diana Greg

Title President

Phone (858) 552-1559

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 type of organization is Diana M. Greg, Ph.D, Inc.?

Diana M. Greg, Ph.D, Inc. is registered in NPPES as a Marriage & Family Therapist (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.