Yao Yao Guan Pollock, MD
NPI 1154692549ActiveIndividual· Internal Medicine, Hematology & Oncology· Santa Rosa, CA
Internal Medicine, Hematology & Oncology (MD) in Santa Rosa, California, trained at Johns Hopkins University School of Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $1,555,331 for 1,002 claims, against $175,173 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 10 companies reporting payments in 2025, $540.43 in all, mostly food and beverage.
Overview
| NPI | 1154692549 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 18, 2012 |
| Last updated in NPPES | Nov 9, 2021 |
| Certified by provider | Nov 9, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A147607 | CA |
| Internal Medicine, Geriatric Medicine | 207RG0300X | A147607 | 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 | 246 |
|---|---|
| Services billed | 2,296 across 14 procedure codes |
| Paid by Medicare | $175,173 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,002 · 1,217 30-day fills |
|---|---|
| Patients | 189 |
| Total drug cost | $1,555,331 |
| Generic share | 82% of claims |
Education and affiliations
| Medical school | Johns Hopkins University School of Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Geriatric Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Sutter Bay Medical FoundationFremont, CA · 3,829 clinicians
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliations
- Adventist Health Ukiah ValleyUkiah, CA
- Healdsburg HospitalHealdsburg, CA
- Providence Santa Rosa Memorial HospitalSanta Rosa, CA
- Sonoma Valley HospitalSonoma, CA
- Sutter Santa Rosa Regional HospitalSanta Rosa, CA
Other facilities
- Sutter Care at HomeHome health agency · Santa Rosa, CA
Industry payments (Open Payments)
- 2025$540.43 · 20 payments from 10 companies
- 2024$238.69 · 9 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $112.04 | 4 |
| Merck Sharp & Dohme LLC | $77.02 | 3 |
| Janssen Biotech, Inc. | $76.51 | 3 |
| Daiichi Sankyo Inc. | $74.82 | 3 |
| Tempus Ai, Inc | $53.19 | 2 |
What the 2025 payments were for
- Food and Beverage$540.43 · 20 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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