Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark G Berger, PHD

Clinical Psychologist in Portsmouth, VA · enumerated 2005 · practices at Riverside Physician Services Inc.

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

National Provider Identifier

1649265943

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Registry record

Entity type Individual (Type 1)

Name Mark G Berger

Credential PHD

Sex Male

Practice address 3300 Academy Ave, Academy Crossing Medical Plaza, Portsmouth, VA, 23703

Phone (757) 483-6404

Fax (757) 483-0737

Enumeration date Sep 13, 2005

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 0810000978 (VA) 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
Q80700	Other	VA	SENTARA
027831	Other	VA	ANTHEM

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 NPI 1649265943 active?

Yes, as of the latest NPPES snapshot, NPI 1649265943 is active (record last updated 2007-07-08).

How do I verify Mark Berger's NPI record?

Cross-check NPI 1649265943 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.