Sanna E Herwald, MD
Interventional Radiology · Stanford
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 12
- 1 carrier
- Offices
- 2
Offices
2 locations · Stanford Health Care · University of Wisconsin Medical Foundation Inc
Looking this up.
Hospitals listed: University of Wi Hospitals & Clinics Authority. That is not proof they admit you there this week.
Plans that list them
12 plans · 1 carrier
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Herwald’s office to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
| Alignment Health BreathEasy (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Clarity (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Harmony (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes CalPlus (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Heart & Diabetes Care (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Heart & Diabetes Choice (HMO C-SNP) | Alignment Health Plan | Listed | Sep 28, 2026 |
| Alignment Health Honor+ Plan (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health My Choice CalCare (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health Silicon (HMO C-SNP) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health smartHMO (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
| Alignment Health the ONE (HMO) | Alignment Health Plan | Listed | Oct 3, 2026 |
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.
- University of Wi Hospitals & Clinics AuthorityMadison, WIAcute Care Hospital · Government - Hospital District or Authority · Has an emergency departmentPart of UW Health, which runs 3 hospitals in 2 statesHome of University of Wisconsin Carbone Cancer Center, a National Cancer Institute designated comprehensive cancer centrePatients rate it 4 of 5 · 82% would definitely recommend itOverall rating: 5 of 5 starsWorse than the national rate — Perioperative pulmonary embolism or deep vein thrombosis rate: 4.93 (3.64 to 6.22) · 5,729 cases, Jul 2022 – Jun 2024Worse than the national rate — SSI - Colon Surgery: 1.52, Oct 2024 – Sep 2025Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.485, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.593, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.613, Oct 2024 – Sep 2025
See every measure and the patient survey for University of Wi Hospitals & Clinics Authority
Behind the star rating — Deaths: 3 better, 5 the same, 0 worse of 8 measures. Safety: 2 better, 6 the same, 0 worse of 8 measures. Readmissions: 1 better, 9 the same, 1 worse of 11 measures. The star rating is worked out from an earlier period than the measures below, so the two can disagree.
| Perioperative pulmonary embolism or deep vein thrombosis rateComplications and deaths | 4.93 (3.64 to 6.22) · 5,729 cases | Worse | Jul 2022 – Jun 2024 |
| SSI - Colon SurgeryInfections | 1.52 | Worse | Oct 2024 – Sep 2025 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.485 | Better | Oct 2024 – Sep 2025 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.593 | Better | Oct 2024 – Sep 2025 |
| Clostridium Difficile (C.Diff)Infections | 0.613 | Better | Oct 2024 – Sep 2025 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1.41 (0.74 to 2.09) · 4,035 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 1.04 (0.87 to 1.22) | No different | Jul 2022 – Jun 2024 |
| Death rate among surgical inpatients with serious treatable complicationsComplications and deaths | 181.11 (148.97 to 213.24) · 341 cases | No different | Jul 2022 – Jun 2024 |
| Death rate for CABG surgery patientsComplications and deaths | 2.1 · 173 cases | None | Jul 2022 – Jun 2025 |
| Death rate for COPD patientsComplications and deaths | 6.8 · 126 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart attack patientsComplications and deaths | 11.6 · 365 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart failure patientsComplications and deaths | 8.5 · 619 cases | None | Jul 2022 – Jun 2025 |
| Death rate for pneumonia patientsComplications and deaths | 9.3 · 582 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 10.7 · 523 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 2.5 · 6,380 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.2 (0.04 to 0.37) · 14,967 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.23 (0.06 to 0.39) · 16,098 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 1.8 (0.76 to 2.84) · 3,095 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 2.56 (1.56 to 3.56) · 4,743 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative respiratory failure rateComplications and deaths | 9.25 (6.19 to 12.31) · 2,990 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 3.89 (2.03 to 5.75) · 3,097 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 2 (0.84 to 3.16) · 1,690 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.71 (0.33 to 1.09) · 13,588 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 3.5 · 194 cases | None | Apr 2023 – Mar 2025 |
| MRSA BacteremiaInfections | 0.707 | No different | Oct 2024 – Sep 2025 |
| SSI - Abdominal HysterectomyInfections | 0.405 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 13.9 · 487 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 20 · 939 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for heart attack patientsUnplanned return visits | -2 · 407 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for heart failure patientsUnplanned return visits | -5.7 · 700 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | 7.6 · 592 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 16.5 · 718 cases | None | Jul 2023 – Jun 2025 |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits | 6.5 (5.4 to 7.9) · 1,266 cases | No different | Jan 2024 – Dec 2024 |
| Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits | 9.6 (8.2 to 11.4) · 1,266 cases | No different | Jan 2024 – Dec 2024 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 5.3 · 203 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for CABGUnplanned return visits | 10.8 · 170 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 21.6 · 234 cases | None | Jul 2023 – Jun 2025 |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits | 12.2 (10.2 to 14.7) · 7,655 cases | No different | Jan 2022 – Dec 2024 |
| Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits | 0.9 (0.7 to 1) · 2,865 cases | No different | Jan 2024 – Dec 2024 |
What patients said (3,209 patients answered, 34% of those asked)
| Cleanliness | 4 |
| Nurse communication | 4 |
| Doctor communication | 4 |
| Communication about medicines | 3 |
| Discharge information | 5 |
| Overall hospital rating | 4 |
| Quietness | 3 |
| Recommend hospital | 5 |
| Room was "always" clean | 70% |
| Nurses "always" communicated well | 81% |
| Doctors "always" communicated well | 79% |
| Staff "always" explained | 62% |
| Yes, staff "did" give patients this information | 91% |
| Yes, staff "did" give patients information about help after discharge | 91% |
| Doctors "always" explained things so they could understand | 73% |
| Doctors "always" listened carefully | 79% |
| Doctors "always" treated them with courtesy and respect | 86% |
| Patients who gave a rating of "9" or "10" (high) | 77% |
| Staff "always" explained new medications | 74% |
| Nurses "always" explained things so they could understand | 77% |
| Nurses "always" listened carefully | 80% |
| Nurses "always" treated them with courtesy and respect | 88% |
| "Always" quiet at night | 57% |
| "YES", patients would definitely recommend the hospital | 82% |
| Staff "always" explained possible side effects | 49% |
| Yes, staff "did" give patients information about possible symptoms | 91% |
Money from drug and device companies
$162 in 2025
| 2025 | 4 | 4 | None | $162 |
| 2024 | 1 | 9 | None | $1,505 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Bard Peripheral Vascular | Venovo | $72 | 1 payment
|
| Asahi Intecc USA | Asahi Peripheral Vascular Wires | $46 | 1 payment
|
| Terumo Medical | Progreat | $24 | 1 payment
|
| W. L. Gore & Associates | Gore Viabahn Vbx Balloon Expandable Endo | $20 | 1 payment
|
See all 4 published payments
| Terumo Medical | Meals · 2025-05-07 | Progreat | $24 |
| Bard Peripheral Vascular | Meals · 2025-04-09 | Venovo | $72 |
| Asahi Intecc USA | Meals · 2025-03-19 | Asahi Peripheral Vascular Wires | $46 |
| W. L. Gore & Associates | Meals · 2025-02-14 | Gore Viabahn Vbx Balloon Expandable Endo | $20 |
See earlier years (2024)
2024: $1,505
| Boston Scientific | Embold Fibered | $1,505 | 9 payments
|
Professional record
- NPI
- 1710449111
- Trained
- Tufts University School of Medicine, 2019
- Group
- Stanford Health Care · University of Wisconsin Medical Foundation Inc
- Gender
- Female
More record details
- Sole proprietor
- No
- Taxonomy
- Federal specialty code 2085R0204X (2085R0204X); Diagnostic radiology (2085R0202X)
- Mailing address
- 300 Pasteur Dr, Stanford, CA, 94305
- NPI first listed
- 2019-04-03
- NPI last updated
- 2025-09-29
- NPI record certified
- 2025-09-29
This is when the NPI record was last certified, not a medical board exam.
Extra NPI addresses: 800 Highland Avenue, Madison, WI, 53792 · 1101 Van Ness Ave Ste 1120, San Francisco, CA, 94109