Steven Yu, MD
NPI 1659643682 · Hematology & Oncology Physician · Fountain Valley, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Steven Yu, MD is a Hematology & Oncology Physician provider in Fountain Valley, CA (NPI 1659643682).
Provider details
- NPI number
- 1659643682
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A122462 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
14 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,202 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 207 | $192 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 202 | $122 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 163 | $148 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 149 | $32 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 126 | $138 |
| Administration of Additional New Drug Or Substance Into Vein, 1 Hour Or Less96417 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 80 | 23 |
| Amlodipine Besylate | 43 | 21 |
| Alendronate Sodium | 37 | 13 |
| Tamoxifen Citrate | 36 | 11 |
| Ondansetron Hcl | 35 | 13 |
| Anastrozole | 33 | 11 |
| Leuprolide Acetatebrand: Lupron Depot | 32 | 15 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$6,308 across 270 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 (1)
- 3801 Katella Ave Ste 207Los Alamitos, CA 90720-3382Phone: (714) 698-0300Fax: (714) 698-0303
Registry dates
- Enumerated
- 2012-02-07
- Last updated
- 2025-05-21
- Certified
- 2025-05-21
Frequently asked questions
- What is Steven Yu's NPI number?
- Steven Yu's National Provider Identifier (NPI) is 1659643682, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Steven Yu's specialty?
- Steven Yu is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Steven Yu located?
- Steven Yu's practice location on file with NPPES is 11180 Warner Ave Ste 351, Fountain Valley, CA 92708-7516.
- What is Steven Yu's phone number?
- The practice phone number listed in the NPPES registry for Steven Yu is (714) 698-0300.
- Does Steven Yu accept Medicare?
- Steven Yu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Steven Yu's NPI active?
- Yes — Steven Yu's NPI (1659643682) is active in the NPPES registry as of the last update on 2025-05-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.