Weber Chen, M.D.
NPI 1679504393 · Hematology & Oncology Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Weber Chen, M.D. is a Hematology & Oncology Physician provider in Pasadena, CA (NPI 1679504393).
Provider details
- NPI number
- 1679504393
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A85444 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
7,133 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) |
|---|---|---|
| Assessment of Emotional Or Behavioral Problems96127 | 1,156 | $5 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 907 | $138 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 801 | $122 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 700 | $193 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 673 | $16 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 585 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 53 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Epoetin Alfabrand: Procrit | 147 | 49 |
| Anastrozole | 138 | 43 |
| Enzalutamidebrand: Xtandi | 127 | 17 |
| Osimertinib Mesylatebrand: Tagrisso | 124 | 13 |
| Filgrastim-Sndzbrand: Zarxio | 113 | 39 |
| Lenalidomidebrand: Revlimid | 95 | 12 |
| Tamoxifen Citrate | 89 | 28 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$5,240 across 215 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
Registry dates
- Enumerated
- 2006-07-05
- Last updated
- 2021-07-21
- Certified
- 2021-07-21
Frequently asked questions
- What is Weber Chen's NPI number?
- Weber Chen's National Provider Identifier (NPI) is 1679504393, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Weber Chen's specialty?
- Weber Chen is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Weber Chen located?
- Weber Chen's practice location on file with NPPES is 50 Alessandro Pl Ste 310, Pasadena, CA 91105-4000.
- What is Weber Chen's phone number?
- The practice phone number listed in the NPPES registry for Weber Chen is (626) 288-0008.
- Does Weber Chen accept Medicare?
- Weber Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Weber Chen's NPI active?
- Yes — Weber Chen's NPI (1679504393) is active in the NPPES registry as of the last update on 2021-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.