Winnie W Chan, MD
Emergency Medicine · Castro Valley
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- Not verified
- Not the same as out of network.
- Offices
- 2
Offices
2 locations · Eden Emergency Medical Group Inc · Permanente Medical Group Inc
Hospitals listed: Kaiser Foundation Hospital - San Francisco. That is not proof they admit you there this week.
Plan participation
Not verified
We could not verify current plan participation for this doctor. This does not mean they are out of network. Call Dr. Chan’s office to ask if they take your plan before you enroll.
California Medical Board record
Licence A152574 · Current
Licensed to practise in California · since 2017 · expires 2027-11-30 · University of California San Francisco School of Medicine.
No disciplinary actions, convictions, malpractice judgments or citations in this record.
Hospitals they work in
1 hospital
These rate the hospital, not this clinician. Most measures at most hospitals are no different from the national rate.
- Kaiser Foundation Hospital - San FranciscoSan Francisco, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of Kaiser Permanente, which runs 41 hospitals in 3 statesPatients rate it 3 of 5 · 72% would definitely recommend itOverall rating: 4 of 5 starsWorse than the national rate — SSI - Colon Surgery: 2.458, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.247, Oct 2024 – Sep 2025
See every measure and the patient survey for Kaiser Foundation Hospital - San Francisco
Behind the star rating — Deaths: 0 better, 1 the same, 0 worse of 1 measures. Safety: 2 better, 5 the same, 0 worse of 7 measures. Readmissions: 0 better, 1 the same, 0 worse of 1 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.
| SSI - Colon SurgeryInfections | 2.458 | Worse | Oct 2024 – Sep 2025 |
| Clostridium Difficile (C.Diff)Infections | 0.247 | Better | Oct 2024 – Sep 2025 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1 (0 to 2.07) · 140 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 1.17 (0.73 to 1.61) | No different | Jul 2022 – Jun 2024 |
| Death rate for stroke patientsComplications and deaths | 12.9 · 175 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 3.1 · 2,575 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.2 (0 to 0.44) · 624 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.26 (0.05 to 0.48) · 702 cases | No different | Jul 2022 – Jun 2024 |
| Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths | 3.21 (0.68 to 5.75) · 228 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 1.5 (0 to 3.14) · 122 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 2.14 (0.48 to 3.8) · 205 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative respiratory failure rateComplications and deaths | 7.91 (0 to 16.05) · 130 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 4.72 (0.6 to 8.85) · 123 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.73 (0.21 to 3.25) · 56 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 1.52 (0.38 to 2.65) · 562 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 4.2 · 44 cases | None | Apr 2023 – Mar 2025 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.37 | No different | Oct 2024 – Sep 2025 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.454 | No different | Oct 2024 – Sep 2025 |
| MRSA BacteremiaInfections | 0.436 | No different | Oct 2024 – Sep 2025 |
| SSI - Abdominal HysterectomyInfections | 1.823 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 12.9 · 467 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 21.8 · 497 cases | None | Jul 2023 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 17 · 317 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for CABGUnplanned return visits | 10 · 266 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 19.1 · 111 cases | None | Jul 2023 – Jun 2025 |
What patients said (2,553 patients answered, 29% of those asked)
| Cleanliness | 3 |
| Nurse communication | 3 |
| Doctor communication | 4 |
| Communication about medicines | 3 |
| Discharge information | 3 |
| Overall hospital rating | 3 |
| Quietness | 2 |
| Recommend hospital | 4 |
| Room was "always" clean | 65% |
| Nurses "always" communicated well | 76% |
| Doctors "always" communicated well | 81% |
| Staff "always" explained | 58% |
| Yes, staff "did" give patients this information | 86% |
| Yes, staff "did" give patients information about help after discharge | 87% |
| Doctors "always" explained things so they could understand | 76% |
| Doctors "always" listened carefully | 80% |
| Doctors "always" treated them with courtesy and respect | 87% |
| Patients who gave a rating of "9" or "10" (high) | 69% |
| Staff "always" explained new medications | 73% |
| Nurses "always" explained things so they could understand | 72% |
| Nurses "always" listened carefully | 73% |
| Nurses "always" treated them with courtesy and respect | 83% |
| "Always" quiet at night | 39% |
| "YES", patients would definitely recommend the hospital | 72% |
| Staff "always" explained possible side effects | 44% |
| Yes, staff "did" give patients information about possible symptoms | 85% |
Original Medicare doctor bills
$2,551
Medicare paid this office $2,551 for 30 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Emergency department visit with low level of medical decision making | 14 | $659 | $47 |
Who their Medicare patients are
30 Original Medicare patients in 2024. Average age 70 · Women 50% · Health risk score 1.09. At or below the middle of the specialty; the typical emergency medicine clinician is at 2.01.
Conditions among them: High blood pressure 60%.
The office billed $17,231, Medicare allowed $3,602 and paid $2,551; for 35 services of 8 kinds.
Original Medicare patients only. A risk score of 1.0 is the average Medicare patient; higher means sicker. Any count under 11 is hidden.
Year by year
| 2024 | 30 | 35 | 70 | 1.09 | $17,231 | $2,551 |
| 2023 | 27 | 29 | 66 | 1.31 | $15,348 | $2,406 |
| 2022 | 294 | 494 | 74 | 2.63 | $478,678 | $50,702 |
| 2021 | 569 | 1,005 | 75 | 2.31 | $954,349 | $104,322 |
| 2020 | 214 | 341 | 74 | 2.09 | $355,107 | $35,934 |
Original Medicare only. A service billed for fewer than 11 people in a year is hidden, so the lines can add up to less than the year's total.
See the services billed each year
2022: 6 services
| Emergency department visit with high level of medical decision making | 183 | $31,301 | $169 |
| Critical care, first 30-74 minutes | 41 | $9,187 | $224 |
| Emergency department visit with moderate level of medical decision making | 47 | $4,779 | $100 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 136 | $1,100 | $7 |
| Emergency department visit with low level of medical decision making | 17 | $864 | $51 |
| Ultrasound of heart, follow-up | 16 | $344 | $22 |
2021: 6 services
| Emergency department visit with high level of medical decision making | 405 | $71,890 | $168 |
| Critical care, first 30-74 minutes | 68 | $15,968 | $222 |
| Emergency department visit with moderate level of medical decision making | 70 | $7,495 | $104 |
| Emergency department visit with low level of medical decision making | 34 | $2,236 | $62 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 262 | $2,156 | $7 |
| Ultrasound of heart, follow-up | 35 | $800 | $23 |
2020: 5 services
| Emergency department visit with high level of medical decision making | 171 | $27,974 | $159 |
| Critical care, first 30-74 minutes | 15 | $3,362 | $224 |
| Emergency department visit with moderate level of medical decision making | 18 | $1,769 | $98 |
| Emergency department visit with low level of medical decision making | 11 | $678 | $57 |
| Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 78 | $662 | $8 |
Medicaid work
$12,736 in 2024
Medicaid paid $12,736 for 120 billed services this clinician did in 2024, up to 19 people in a month for one service.
Medicaid and CHIP claims where this clinician did the service, fee-for-service and managed care together. Any month with fewer than 11 patients is hidden, so small Medicaid practices undercount.
| EMERGENCY DEPT VISIT LOW MDM | 89 | $7,045 |
| EMERGENCY DEPT VISIT MOD MDM | 31 | $5,692 |
| 2024 | 120 | 2 | 19 | $12,736 |
| 2023 | 30 | 2 | 17 | $591 |
| 2022 | 743 | 7 | 45 | $21,255 |
| 2021 | 1,819 | 10 | 67 | $77,155 |
| 2020 | 523 | 5 | 56 | $17,287 |
See the largest Medicaid services in earlier years
2023
| EMERGENCY DEPT VISIT MOD MDM | 13 | $301 |
| EMERGENCY DEPARTMENT VISIT STRAIGHTFORWARD MDM | 17 | $290 |
2022
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 212 | $11,032 |
| EMERGENCY DEPT VISIT MOD MDM | 145 | $5,633 |
| EMERGENCY DEPT VISIT LOW MDM | 134 | $2,792 |
| Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only | 151 | $899 |
| Service | 13 | $505 |
| Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count | 57 | $227 |
| COMPREHENSIVE METABOLIC PANEL | 31 | $168 |
2021
| EMERGENCY DEPT VISIT MOD MDM | 309 | $35,904 |
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 585 | $30,458 |
| EMERGENCY DEPT VISIT LOW MDM | 255 | $5,368 |
| Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only | 373 | $2,359 |
| Service | 40 | $1,550 |
| Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count | 121 | $568 |
| COMPREHENSIVE METABOLIC PANEL | 83 | $534 |
| EMERGENCY DEPARTMENT VISIT MAY NOT REQ PHYS/QHP | 29 | $194 |
| Electrocardiogram, routine ECG with at least 12 leads; tracing only, without interpretation and report | 12 | $149 |
| Basic metabolic panel (Calcium, total) This panel must include the following: Calcium, total (82310) Carbon dioxide (bicarbonate) (82374) Chloride (82435) Creatinine (82565) Glucose (82947) Potassium (84132) Sodium (84295) Urea nitrogen (BUN) (84520) | 12 | $72 |
2020
| EMERGENCY DEPARTMENT VISIT HIGH MDM | 206 | $10,893 |
| EMERGENCY DEPT VISIT MOD MDM | 108 | $3,961 |
| EMERGENCY DEPT VISIT LOW MDM | 65 | $1,596 |
| Electrocardiogram, routine ECG with at least 12 leads; interpretation and report only | 131 | $814 |
| Blood count; complete (CBC), automated (Hgb, Hct, RBC, WBC and platelet count) and automated differential WBC count | 13 | $24 |
Drugs they prescribed that Part D paid
$8,829
Pharmacies billed $8,829 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 8% of their Part D prescriptions (18 of 228) in 2024. At or below the middle of the specialty; the typical emergency medicine clinician is at 12%.
201 generic and 27 brand-name prescriptions · $8,829 in drug cost · 47 antibiotic prescriptions to 39 people.
Part D prescriptions only. The opioid rate is opioid prescriptions as a share of all this clinician's Part D prescriptions; surgeons and pain specialists run higher than others, so it is shown against the same specialty.
| Oxycodone | 12 | $73 | $6 |
Year by year
| 2024 | 228 | 132 | 8% (18) | 12% | $8,829 |
| 2023 | 170 | 134 | 11% (19) | None | $4,952 |
| 2022 | 105 | 86 | None | None | $4,100 |
| 2021 | 99 | 85 | None | None | $2,180 |
| 2020 | 29 | 24 | None | None | $2,670 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 3 drugs
| Cefadroxil | 11 | $165 | $15 |
| Prednisone | 11 | $84 | $8 |
| Oxycodone | 12 | $74 | $6 |
2022: 1 drug
| Cephalexin | 19 | $145 | $8 |
2021: 1 drug
| Cephalexin | 19 | $140 | $7 |
Professional record
- NPI
- 1538521281
- Licence
- CA A152574California A152574: Current · expires 2027-11-30
- Trained
- University of California, San Francisco School of Medicine, 2016
- Group
- Eden Emergency Medical Group Inc · Permanente Medical Group Inc
- Gender
- Female
More record details
- Sole proprietor
- No
- Taxonomy
- Federal specialty code 207P00000X (207P00000X); Student in a training program (390200000X)
- Mailing address
- 1370 8th Ave Apt 4, San Francisco, CA, 94122
- NPI first listed
- 2016-03-22
- NPI last updated
- 2022-05-31
- NPI record certified
- 2022-05-31
This is when the NPI record was last certified, not a medical board exam.
This office lists an electronic records connection.