Karen Y Chen, PA
Physician Assistant · Fremont, CA
At a glance
39210 State St Ste 218, Fremont, CA 94538-1456
NPPES record updated Jan 19, 2023. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
39210 State St Ste 218Fremont, CA 94538-1456
Additional reported practice locations
603 S Knickerbocker DrSunnyvale, CA 940871034
Phone: 4087360441
Fax: 4087360722 3060 Broadway
Redwood City, CA 940621512
Phone: 6503611177
Fax: 6503611826 2420 Samaritan Dr
San Jose, CA 951243907
Phone: 4083695600
Fax: 4083695625 525 South Dr Ste 115
Mountain View, CA 940404211
Phone: 6509696500
Education & affiliations
No matching clinician background record in the imported CMS release.
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $3,091.35 |
| Education | $9.65 |
Reporting companies
| Company | Amount |
|---|---|
| ORGANON LLC | $421.68 |
| INCYTE CORPORATION | $413.04 |
| LEO PHARMA INC. | $412.90 |
| GALDERMA LABORATORIES, L.P. | $372.98 |
| ABBVIE INC. | $296.12 |
| ARCUTIS BIOTHERAPEUTICS, INC. | $198.86 |
| PFIZER INC. | $159.10 |
| JANSSEN BIOTECH, INC. | $151.96 |
| Other reporting companies | $674.36 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Physician Assistant
- Taxonomy code
- 363A00000X
- Enumeration date
- Apr 6, 2021
- Record updated
- Jan 19, 2023
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- PA
Reported taxonomies and licenses
363A00000X · Primary
License reported: 60110 CA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
39210 State St Ste 218Fremont, CA 94538-1456
- Phone
- (510) 790-0477
- Fax
- (510) 790-1835
Mailing address
525 SOUTH DR STE 115MOUNTAIN VIEW, CA 940404211
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
Report a directory issue