Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Matthew J Gardiner, MD

Psychiatry Physician in Marina, CA · enumerated 2006.

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

National Provider Identifier

1629084710

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Registry record

Entity type Individual (Type 1)

Name Dr. Matthew J Gardiner

Credential MD

Sex Male

Practice address 299 12th St, Marina, CA, 93933

Phone (831) 647-7652

Enumeration date Jul 31, 2006

Last updated in NPPES Jan 31, 2025

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 475067-1205 (UT) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License C159653 (CA) Primary

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

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 specialty is Matthew Gardiner?

Matthew Gardiner is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Interim, Inc. Community/Behavioral Health Agency · Marina, CA NPI 1558586909 Emily Vicioso Counselor · Marina, CA NPI 1841418753 Melissa Black Clinical Social Worker · Marina, CA NPI 1336337732 Suzie Sullivan Clinical Social Worker · Marina, CA NPI 1730482597 Momoko Takeda Marriage & Family Therapist · Marina, CA NPI 1528496536 Jose Barajas Social Worker · Marina, CA NPI 1760812358 Ena Rosa Marriage & Family Therapist · Marina, CA NPI 1003232026 County of Monterey Family Medicine Physician · Marina, CA NPI 1912310855

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-31.