Helen Chen, MD
NPI 1578546388 · Radiation Oncology Physician · South Pasadena, CA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Helen Chen, MD is a Radiation Oncology Physician provider in South Pasadena, CA (NPI 1578546388).
Provider details
- NPI number
- 1578546388
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- G70470 (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 tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
3,722 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Intensity Modulated Treatment Delivery, Single Or Multiple Fields/Arcs,via Narrow Spatially and Temporally Modulated Beams, Binary, Dynamic Mlc, Per Treatment SessionG6015 | 792 | $427 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 773 | $139 |
| Radiation Treatment Delivery,3 Or More Separate Treatment Areas, Custom Blocking, Tangential Ports, Wedges, Rotational Beam, Compensators, Electron Beam; 6-10 MevG6012 | 388 | $276 |
| Radiation Treatment Management, 5 Treatment Sessions77427 | 283 | $207 |
| Continuing Radiation Therapy Consultation Per Week77336 | 276 | $106 |
| Calculation of Radiation Therapy Dose77300 | 258 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Tamsulosin Hcl | 15 |
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.
Practice location
Mailing address
Additional practice locations (1)
- 1500 Duarte RdDuarte, CA 91010-3012Phone: (626) 359-8111
Registry dates
- Enumerated
- 2005-11-25
- Last updated
- 2020-11-23
- Certified
- 2020-11-23
Frequently asked questions
- What is Helen Chen's NPI number?
- Helen Chen's National Provider Identifier (NPI) is 1578546388, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Helen Chen's specialty?
- Helen Chen is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Helen Chen located?
- Helen Chen's practice location on file with NPPES is 209 Fair Oaks Ave, South Pasadena, CA 91030-1814.
- What is Helen Chen's phone number?
- The practice phone number listed in the NPPES registry for Helen Chen is (626) 396-2900.
- Does Helen Chen accept Medicare?
- Helen Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Helen Chen's NPI active?
- Yes — Helen Chen's NPI (1578546388) is active in the NPPES registry as of the last update on 2020-11-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.