Tianyi Tang, M.D., PH.D.
NPI 1902285760ActiveIndividual· Internal Medicine, Hematology & Oncology· Walnut Creek, CA
Internal Medicine, Hematology & Oncology (M.D., PH.D.) with John Muir Physician Network, practicing in Walnut Creek, California. Their prescriptions cost Medicare Part D more than their services did: $752,877 for 721 claims, against $452,953 paid for services in 2024. Genentech USA, Inc. was the largest of 34 companies reporting payments in 2025, $3,714 in all, mostly food and beverage. Lists John Muir Medical Center - Concord Campus and 1 other hospital as hospital affiliations.
Overview
| NPI | 1902285760 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D., PH.D. |
| Sole proprietor | Yes |
| NPI issued | May 27, 2015 |
| Last updated in NPPES | Nov 25, 2025 |
| Certified by provider | Nov 25, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A151192 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 575 |
|---|---|
| Services billed | 17,493 across 102 procedure codes |
| Paid by Medicare | $452,953 |
Part D prescriptions in 2024
| Prescriptions (claims) | 721 · 1,089 30-day fills |
|---|---|
| Patients | 154 |
| Total drug cost | $752,877 |
| Generic share | 76% of claims |
Education and affiliations
| Graduation year | 2009 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- John Muir Physician NetworkPleasant Hill, CA · 494 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Other facilities
- John Muir Home Health ServicesHome health agency · Concord, CA
Industry payments (Open Payments)
- 2025$3,714 · 118 payments from 34 companies
- 2024$2,085 · 46 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genentech USA, Inc. | $1,079 | 2 |
| Pfizer Inc. | $289.79 | 11 |
| Merck Sharp & Dohme LLC | $276.61 | 11 |
| Astrazeneca Pharmaceuticals LP | $237.54 | 14 |
| Daiichi Sankyo Inc. | $178.74 | 9 |
What the 2025 payments were for
- Food and Beverage$2,605 · 115 payments
- Consulting Fee$1,070 · 1 payment
- Education$39.09 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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