Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas Sean William Petit, MD

Q: What is the NPI number for Thomas Petit?

The National Provider Identifier (NPI) for Thomas Petit is 1134423387, a Type 1 (individual) record in the CMS NPPES registry.

Internal Medicine Physician in Norwalk, CA · enumerated 2011.

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

National Provider Identifier

1134423387

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas Sean William Petit

Credential MD

Sex Male

Practice address 10937 Firestone Blvd, Norwalk, CA, 90650

Phone (562) 262-2111

Enumeration date Jan 3, 2011

Last updated in NPPES Aug 15, 2026

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License ME144317 (FL) Primary

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License C196078 (CA) Secondary

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

Where does Thomas Petit practice?

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

What is the NPI number for Thomas Petit?

The National Provider Identifier (NPI) for Thomas Petit is 1134423387, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-08-15.