James Tsai, M.D.
NPI 1437152857 · Hematology & Oncology Physician · Hemet, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Tsai, M.D. is a Hematology & Oncology Physician provider in Hemet, CA (NPI 1437152857).
Provider details
- NPI number
- 1437152857
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A70963 (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
21 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
3,492 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) |
|---|---|---|
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 813 | $132 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 590 | $132 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 331 | $30 |
| Administration of Chemotherapy Into Vein, Each Additional Hour96415 | 306 | $29 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 305 | $15 |
| Infusion Into a Vein for Hydration, Each Additional Hour96361 | 243 | $13 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 81 | 22 |
| Hydroxyurea | 64 | 11 |
| Ondansetron Hcl | 42 | 27 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 36 | — |
| Pantoprazole Sodium | 35 | — |
| Acyclovir | 30 | — |
| Letrozole | 29 | — |
| Prednisone |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$280 across 12 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
- 2005-05-31
- Last updated
- 2025-08-27
- Certified
- 2025-08-27
Frequently asked questions
- What is James Tsai's NPI number?
- James Tsai's National Provider Identifier (NPI) is 1437152857, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Tsai's specialty?
- James Tsai is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is James Tsai located?
- James Tsai's practice location on file with NPPES is 201 N Laursen St, Hemet, CA 92543-4417.
- What is James Tsai's phone number?
- The practice phone number listed in the NPPES registry for James Tsai is (951) 652-3333.
- Does James Tsai accept Medicare?
- James Tsai is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Tsai's NPI active?
- Yes — James Tsai's NPI (1437152857) is active in the NPPES registry as of the last update on 2025-08-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.