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

Nancy Ngoc Giao Ly, MD, MPH

Occupational Medicine Physician in Walnut Creek, CA · enumerated 2011.

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

National Provider Identifier

1598050205

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Registry record

Entity type Individual (Type 1)

Name Nancy Ngoc Giao Ly

Credential MD, MPH

Sex Female

Practice address Walnut Creek, CA, 94598

Phone (925) 206-2000

Enumeration date Jun 10, 2011

Last updated in NPPES Feb 11, 2022

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

Taxonomy & licenses

2083X0100X Occupational Medicine Physician Allopathic & Osteopathic Physicians · License A153735 (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

Is NPI 1598050205 active?

Yes, as of the latest NPPES snapshot, NPI 1598050205 is active (record last updated 2022-02-11).

How do I verify Nancy Ngoc Giao Ly's NPI record?

Cross-check NPI 1598050205 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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David Fan Allergy & Immunology Physician · Walnut Creek, CA NPI 1619596152

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-02-11.