Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Carol Jean Treinen, MD

Physical Medicine & Rehabilitation Physician in Redwood City, CA · enumerated 2006.

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

National Provider Identifier

1396817136

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Registry record

Entity type Individual (Type 1)

Name Carol Jean Treinen

Credential MD

Sex Female

Practice address 1150 Veterans Blvd, Redwood City, CA, 94063

Phone (650) 299-2000

Enumeration date Nov 15, 2006

Last updated in NPPES Jan 10, 2022

Taxonomy & licenses

208100000X Physical Medicine & Rehabilitation Physician Allopathic & Osteopathic Physicians · License A63328 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
00A633280	Medicaid	CA	-

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

How do I verify Carol Treinen's NPI record?

Cross-check NPI 1396817136 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1396817136 active?

Yes, as of the latest NPPES snapshot, NPI 1396817136 is active (record last updated 2022-01-10).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-10.