NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Deepak Thiagarajan, MD

Geriatric Medicine (Internal Medicine) Physician in Rancho Cucamonga, CA · enumerated 2007.

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

National Provider Identifier

1205052990

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Registry record

Entity type Individual (Type 1)
Name Deepak Thiagarajan
Credential MD
Sex Male
Practice address Rancho Cucamonga, CA, 91730
Phone (909) 881-5994
Fax (909) 248-7769
Enumeration date Apr 18, 2007
Last updated in NPPES Apr 4, 2024

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License MD12318 (RI) Secondary
207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License LP00988 (RI) Secondary
207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License A 113059 (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
414203 Other RI BLUECHIP
DT68425 Medicaid RI -
AA91479 Other RI HPHC - MIRIAM
32935-4 Other RI BCBS

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 Deepak Thiagarajan?
The National Provider Identifier (NPI) for Deepak Thiagarajan is 1205052990, a Type 1 (individual) record in the CMS NPPES registry.
Where does Deepak Thiagarajan practice?
The practice location on file with NPPES is in Rancho Cucamonga, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-04-04.