Karen Chen, PA
NPI 1891374963 · Physician Assistant · Fremont, CA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Chen, PA is a Physician Assistant provider in Fremont, CA (NPI 1891374963).
Provider details
- NPI number
- 1891374963
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA
- Sex
- Female
- Sole proprietor
- No
- License
- 60110 (CA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
5 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
5 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
336 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 102 | $8 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 66 | $93 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 42 | $113 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 28 | $51 |
| Destruction of Skin Growth, 1-14 Growths17110 | 26 | $127 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Triamcinolone Acetonide | 37 | 29 |
| Ketoconazole | 34 | 24 |
| Clobetasol Propionate | 25 | 14 |
| Mupirocin | 17 | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$5,092 across 117 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (4)
- 525 South Dr Ste 115Mountain View, CA 94040-4211Phone: (650) 969-6500
- 3060 BroadwayRedwood City, CA 94062-1512Phone: (650) 361-1177Fax: (650) 361-1826
- 2420 Samaritan DrSan Jose, CA 95124-3907Phone: (408) 369-5600Fax: (408) 369-5625
- 603 S Knickerbocker DrSunnyvale, CA 94087-1034Phone: (408) 736-0441Fax: (408) 736-0722
Registry dates
- Enumerated
- 2021-04-06
- Last updated
- 2023-01-19
- Certified
- 2023-01-19
Frequently asked questions
- What is Karen Chen's NPI number?
- Karen Chen's National Provider Identifier (NPI) is 1891374963, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Chen's specialty?
- Karen Chen is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Karen Chen located?
- Karen Chen's practice location on file with NPPES is 39210 State St Ste 218, Fremont, CA 94538-1456.
- What is Karen Chen's phone number?
- The practice phone number listed in the NPPES registry for Karen Chen is (510) 790-0477.
- Does Karen Chen accept Medicare?
- Karen Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Chen's NPI active?
- Yes — Karen Chen's NPI (1891374963) is active in the NPPES registry as of the last update on 2023-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.