Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Tiffany Hillmen Lai, FNP

Individual provider Family Nurse Practitioner · NPI 1295000578

Tiffany Hillmen Lai, FNP is a Nurse Practitioner in Walnut Creek, California. Qualified in 2012, 14 years ago. Practices with One Medical Group Inc, a 328-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California and New York.

Years since qualifying
14
Licensed in
CA, NY
In the registry since
2012
Specialties on file
2
What do these letters mean?
FNP — Family Nurse Practitioner
A nurse practitioner who treats patients of all ages, much like a family doctor.

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Practice location Address checks out

2337 Oak Grove Rd
Walnut Creek, CA 94598-3506
Phone: (888) 663-6331
Fax: (415) 252-7176
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Nurse Practitioner (primary) Taxonomy 363LF0000X · Licence 21668 (CA)
Family Nurse Practitioner Taxonomy 363LF0000X · Licence 337116 (NY)

Record details

NPI number1295000578
Entity typeIndividual (Type 1)
GenderFemale
Credentials FNP
Sole proprietorNo
NPI enumeratedMarch 20, 2012
Last updated in NPPESMarch 17, 2025
Certification dateMarch 17, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2012 (14 years in practice)
Group practice One Medical Group Inc — 328 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients74
Services billed 110 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at One Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 328 clinicians in the practice; 12 are shown here.

Other providers in Walnut Creek