Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas Welles Backus, M.D.

Psychiatry Physician in Laguna Hills, CA · enumerated 2006.

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

National Provider Identifier

1831288828

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas Welles Backus

Credential M.D.

Sex Male

Practice address 23461 South Pointe Dr. Suite 220, Laguna Hills, CA, 92653

Phone (949) 547-3866

Enumeration date Oct 11, 2006

Last updated in NPPES Nov 15, 2010

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License G40049 (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
G40049	Other	CA	MD LICENSE

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 is the NPI number for Thomas Backus?

The National Provider Identifier (NPI) for Thomas Backus is 1831288828, a Type 1 (individual) record in the CMS NPPES registry.

Where does Thomas Backus practice?

The practice location on file with NPPES is in Laguna Hills, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-11-15.