Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Susanna Yu Tan, M.D.

Infectious Disease Physician in Rancho Santa Margarita, CA · enumerated 2013.

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

National Provider Identifier

1790028728

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Registry record

Entity type Individual (Type 1)

Name Susanna Yu Tan

Credential M.D.

Sex Female

Practice address 1 Legacy Way, Rancho Santa Margarita, CA, 92688

Phone (626) 319-8791

Enumeration date Mar 28, 2013

Last updated in NPPES Aug 23, 2022

Taxonomy & licenses

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License A139148 (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 Susanna Tan?

Susanna Tan is registered in NPPES with the primary taxonomy of Infectious Disease 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-08-23.