Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Lynn Westphal, MD

Reproductive Endocrinology Physician in Los Altos, CA · enumerated 2007.

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

National Provider Identifier

1134269723

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Registry record

Entity type Individual (Type 1)

Name Dr. Lynn Westphal

Credential MD

Sex Female

Practice address 4756 El Camino Real, Los Altos, CA, 94022

Phone (650) 445-4724

Enumeration date Feb 6, 2007

Last updated in NPPES May 23, 2024

Taxonomy & licenses

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License CDRH.0066417 (CO) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License E-15059 (AR) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 2022-00107 (NC) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 35.143879 (OH) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License ME150714 (FL) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License MD210001754 (DC) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 87569 (GA) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License D93277 (MD) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 036.159203 (IL) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 25MA11140100 (NJ) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 298059 (NY) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 2022008450 (MO) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License EMC0001591 (MI) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License 70760 (MN) Secondary

207VE0102X Reproductive Endocrinology Physician Allopathic & Osteopathic Physicians · License G63611 (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

Where does Lynn Westphal practice?

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

What is the NPI number for Lynn Westphal?

The National Provider Identifier (NPI) for Lynn Westphal is 1134269723, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Ramya Sethuram Reproductive Endocrinology Physician · Los Altos, CA NPI 1396123550

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-23.