Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Matthew Louie, M.D.

Psychiatry Physician in Lancaster, CA · enumerated 2011 · practices at Antelope Valley Mental Health Clinic.

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

National Provider Identifier

1609167311

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Registry record

Entity type Individual (Type 1)

Name Dr. Matthew Louie

Credential M.D.

Sex Male

Practice address 349a E Avenue K6, Lancaster, CA, 93535

Phone (661) 723-4260

Fax (661) 723-6975

Enumeration date Apr 28, 2011

Last updated in NPPES Dec 28, 2018

Taxonomy & licenses

2084P0804X Child & Adolescent Psychiatry Physician Allopathic & Osteopathic Physicians · License A127353 (CA) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care · License 28287 (OK) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License A127353 (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.

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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 Matthew Louie?

Matthew Louie 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-12-28.