Gigi Qiqi Chen, M.D.
NPI 1821073636ActiveIndividual· Internal Medicine, Hematology & Oncology· Pleasant Hill, CA
Internal Medicine, Hematology & Oncology (M.D.) with John Muir Physician Network, practicing in Pleasant Hill, California. In 2024 Medicare paid $1,198,008 for 760 patients, and Part D covered 800 of their prescriptions, 76% of them generic. Astrazeneca Pharmaceuticals LP was the largest of 33 companies reporting payments in 2025, $17,261 in all, mostly consulting fees. Lists John Muir Medical Center - Concord Campus and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1821073636 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Dec 14, 2005 |
| Last updated in NPPES | Aug 2, 2021 |
| Certified by provider | Aug 2, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A84387 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 760 |
|---|---|
| Services billed | 53,401 across 118 procedure codes |
| Paid by Medicare | $1,198,008 |
Part D prescriptions in 2024
| Prescriptions (claims) | 800 · 1,509 30-day fills |
|---|---|
| Patients | 218 |
| Total drug cost | $990,977 |
| Generic share | 76% of claims |
Education and affiliations
| Graduation year | 2002 |
|---|---|
| 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
- San Ramon Regional Medical CenterSan Ramon, CA
Other facilities
- John Muir Home Health ServicesHome health agency · Concord, CA
Industry payments (Open Payments)
- 2025$17,261 · 137 payments from 33 companies
- 2024$6,493 · 61 payments from 28 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $4,535 | 12 |
| E.R. Squibb & Sons, L.L.C. | $2,733 | 10 |
| Abbvie Inc. | $2,520 | 9 |
| Pfizer Inc. | $1,949 | 14 |
| Genmab U.S., Inc. | $1,897 | 5 |
What the 2025 payments were for
- Consulting Fee$12,499 · 9 payments
- Food and Beverage$3,088 · 124 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$1,620 · 1 payment
- Education$35.52 · 2 payments
- Travel and Lodging$18.20 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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