Ryan Ruey-En Sun, MD
Urology · Stanford
- Medicare standing
- Clear
- Enrolled, allowed to bill and order, not excluded
- Plans that list them
- 5
- 2 carriers
- Office
- 1
Offices
1 location · Stanford Health Care · 3,152 clinicians in this group
Hospitals listed: Stanford Health Care. That is not proof they admit you there this week.
Plans that list them
5 plans · 2 carriers
A missing listing does not mean out of network. Directories change, and a listing does not cover every office. Call Dr. Sun’s office at (650) 723-4000 to confirm they take your plan. Ask about the office you use, its medical group, referrals and appointments.
5 of 5 plans
| SCAN Balance (HMO C-SNP) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN Classic (HMO) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN MyChoice (HMO) | SCAN Health Plan | Listed | Oct 3, 2026 |
| SCAN Strive (HMO C-SNP) | SCAN Health Plan | Listed | Oct 3, 2026 |
| DualConnect (HMO D-SNP) | Santa Clara Family Health Plan | Listed | Sep 1, 2026 |
California Medical Board record
Licence A177263 · Current
Licensed to practise in California · since 2022 · expires 2028-03-31 · University of Toronto Faculty 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.
- Stanford Health CareStanford, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency departmentPart of Stanford Health Care, which runs 3 hospitalsHome of Stanford Cancer Institute, a National Cancer Institute designated comprehensive cancer centrePatients rate it 4 of 5 · 83% would definitely recommend itOverall rating: 5 of 5 starsWorse than the national rate — Perioperative pulmonary embolism or deep vein thrombosis rate: 5.31 (4.24 to 6.37) · 8,661 cases, Jul 2022 – Jun 2024Worse than the national rate — Rate of inpatient admissions for patients receiving outpatient chemotherapy: 14.1 (12.7 to 15.7) · 2,191 cases, Jan 2024 – Dec 2024Better than the national rate — Postoperative respiratory failure rate: 4.08 (1.95 to 6.21) · 5,296 cases, Jul 2022 – Jun 2024Better than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.317, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.446, Oct 2024 – Sep 2025Better than the national rate — SSI - Colon Surgery: 0.241, Oct 2024 – Sep 2025Better than the national rate — Ratio of unplanned hospital visits after hospital outpatient surgery: 0.7 (0.6 to 0.9) · 3,348 cases, Jan 2024 – Dec 2024
See every measure and the patient survey for Stanford Health Care
Behind the star rating — Deaths: 5 better, 3 the same, 0 worse of 8 measures. Safety: 3 better, 5 the same, 0 worse of 8 measures. Readmissions: 2 better, 5 the same, 4 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 | 5.31 (4.24 to 6.37) · 8,661 cases | Worse | Jul 2022 – Jun 2024 |
| Rate of inpatient admissions for patients receiving outpatient chemotherapyUnplanned return visits | 14.1 (12.7 to 15.7) · 2,191 cases | Worse | Jan 2024 – Dec 2024 |
| Postoperative respiratory failure rateComplications and deaths | 4.08 (1.95 to 6.21) · 5,296 cases | Better | Jul 2022 – Jun 2024 |
| Catheter Associated Urinary Tract Infections (ICU + select Wards)Infections | 0.317 | Better | Oct 2024 – Sep 2025 |
| Clostridium Difficile (C.Diff)Infections | 0.446 | Better | Oct 2024 – Sep 2025 |
| SSI - Colon SurgeryInfections | 0.241 | Better | Oct 2024 – Sep 2025 |
| Ratio of unplanned hospital visits after hospital outpatient surgeryUnplanned return visits | 0.7 (0.6 to 0.9) · 3,348 cases | Better | Jan 2024 – Dec 2024 |
| Abdominopelvic accidental puncture or laceration rateComplications and deaths | 1.06 (0.45 to 1.67) · 5,374 cases | No different | Jul 2022 – Jun 2024 |
| CMS Medicare PSI 90: Patient safety and adverse events compositeComplications and deaths | 0.86 (0.72 to 1) | No different | Jul 2022 – Jun 2024 |
| Death rate among surgical inpatients with serious treatable complicationsComplications and deaths | 166.09 (137.88 to 194.3) · 470 cases | No different | Jul 2022 – Jun 2024 |
| Death rate for CABG surgery patientsComplications and deaths | 1.1 · 192 cases | None | Jul 2022 – Jun 2025 |
| Death rate for COPD patientsComplications and deaths | 6.4 · 146 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart attack patientsComplications and deaths | 9.7 · 253 cases | None | Jul 2022 – Jun 2025 |
| Death rate for heart failure patientsComplications and deaths | 6.3 · 880 cases | None | Jul 2022 – Jun 2025 |
| Death rate for pneumonia patientsComplications and deaths | 10.3 · 935 cases | None | Jul 2022 – Jun 2025 |
| Death rate for stroke patientsComplications and deaths | 8.7 · 501 cases | None | Jul 2023 – Jun 2025 |
| Hybrid Hospital-Wide All-Cause Risk Standardized Mortality RateComplications and deaths | 2.1 · 7,730 cases | None | Jul 2024 – Jun 2025 |
| Iatrogenic pneumothorax rateComplications and deaths | 0.13 (0 to 0.27) · 20,799 cases | No different | Jul 2022 – Jun 2024 |
| In-hospital fall-associated fracture rateComplications and deaths | 0.28 (0.14 to 0.43) · 23,182 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative acute kidney injury requiring dialysis rateComplications and deaths | 0.94 (0.2 to 1.68) · 5,694 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative hemorrhage or hematoma rateComplications and deaths | 2.36 (1.54 to 3.19) · 7,846 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative sepsis rateComplications and deaths | 5.2 (3.76 to 6.64) · 5,603 cases | No different | Jul 2022 – Jun 2024 |
| Postoperative wound dehiscence rateComplications and deaths | 1.38 (0.23 to 2.53) · 2,211 cases | No different | Jul 2022 – Jun 2024 |
| Pressure ulcer rateComplications and deaths | 0.52 (0.21 to 0.83) · 19,915 cases | No different | Jul 2022 – Jun 2024 |
| Rate of complications for hip/knee replacement patientsComplications and deaths | 3.6 · 416 cases | None | Apr 2023 – Mar 2025 |
| Central Line Associated Bloodstream Infection (ICU + select Wards)Infections | 0.869 | No different | Oct 2024 – Sep 2025 |
| MRSA BacteremiaInfections | 0.857 | No different | Oct 2024 – Sep 2025 |
| SSI - Abdominal HysterectomyInfections | 0.368 | No different | Oct 2024 – Sep 2025 |
| Acute Myocardial Infarction (AMI) 30-Day Readmission RateUnplanned return visits | 16.2 · 247 cases | None | Jul 2023 – Jun 2025 |
| Heart failure (HF) 30-Day Readmission RateUnplanned return visits | 20.5 · 1,021 cases | None | Jul 2023 – Jun 2025 |
| Hospital return days for heart attack patientsUnplanned return visits | 47.8 · 258 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for heart failure patientsUnplanned return visits | -1.6 · 990 cases | None | Jul 2022 – Jun 2025 |
| Hospital return days for pneumonia patientsUnplanned return visits | 20.8 · 976 cases | None | Jul 2022 – Jun 2025 |
| Pneumonia (PN) 30-Day Readmission RateUnplanned return visits | 16.5 · 959 cases | None | Jul 2023 – Jun 2025 |
| Rate of emergency department (ED) visits for patients receiving outpatient chemotherapyUnplanned return visits | 5.2 (4.4 to 6.2) · 2,191 cases | No different | Jan 2024 – Dec 2024 |
| Rate of readmission after hip/knee replacementUnplanned return visits | 5.1 · 425 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for CABGUnplanned return visits | 9.6 · 158 cases | None | Jul 2023 – Jun 2025 |
| Rate of readmission for chronic obstructive pulmonary disease (COPD) patientsUnplanned return visits | 19.6 · 183 cases | None | Jul 2023 – Jun 2025 |
| Rate of unplanned hospital visits after colonoscopy (per 1,000 colonoscopies)Unplanned return visits | 12.7 (10.4 to 15.4) · 4,578 cases | No different | Jan 2022 – Dec 2024 |
What patients said (6,810 patients answered, 25% of those asked)
| Cleanliness | 4 |
| Nurse communication | 4 |
| Doctor communication | 4 |
| Communication about medicines | 3 |
| Discharge information | 4 |
| Overall hospital rating | 4 |
| Quietness | 2 |
| Recommend hospital | 5 |
| Room was "always" clean | 75% |
| Nurses "always" communicated well | 82% |
| Doctors "always" communicated well | 81% |
| Staff "always" explained | 63% |
| Yes, staff "did" give patients this information | 89% |
| Yes, staff "did" give patients information about help after discharge | 89% |
| 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) | 79% |
| Staff "always" explained new medications | 76% |
| Nurses "always" explained things so they could understand | 77% |
| Nurses "always" listened carefully | 79% |
| Nurses "always" treated them with courtesy and respect | 88% |
| "Always" quiet at night | 53% |
| "YES", patients would definitely recommend the hospital | 83% |
| Staff "always" explained possible side effects | 50% |
| Yes, staff "did" give patients information about possible symptoms | 90% |
Original Medicare doctor bills
$126,184
Medicare paid this office $126,184 for 393 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Return visit (30+ min) | 135 | $18,571 | $113 |
| New patient visit (45+ min) | 115 | $16,550 | $144 |
| Diagnostic exam of bladder and urethra using an endoscope | 66 | $16,047 | $240 |
| Crushing of stone of ureter with insertion of stent using an endoscope | 24 | $10,040 | $346 |
| Short return visit (20+ min) | 81 | $8,058 | $81 |
See all 19 services
| Return visit (30+ min) | 135 | $18,571 | $113 |
| New patient visit (45+ min) | 115 | $16,550 | $144 |
| Diagnostic exam of bladder and urethra using an endoscope | 66 | $16,047 | $240 |
| Crushing of stone of ureter with insertion of stent using an endoscope | 24 | $10,040 | $346 |
| Short return visit (20+ min) | 81 | $8,058 | $81 |
| Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies | 34 | $6,033 | $172 |
| Long return visit (40+ min) | 21 | $3,618 | $164 |
| Insertion of device into abdomen with pressure and urine flow rate study | 32 | $2,766 | $86 |
| Insertion of stent in ureter using an endoscope | 18 | $2,142 | $97 |
| New patient visit (60+ min) | 11 | $2,037 | $185 |
| New patient visit (45+ min) | 16 | $1,557 | $97 |
| Ultrasound measurement of bladder capacity after voiding | 76 | $1,068 | $12 |
| Simple bladder irrigation and/or instillation | 11 | $861 | $78 |
| Return visit (30+ min) | 13 | $823 | $63 |
| Non-needle measurement and recording of electrical activity of muscles at bladder and bowel openings | 34 | $721 | $21 |
| Review by radiologist of urinary bladder image | 31 | $688 | $21 |
| Short return visit | 12 | $672 | $56 |
| Electronic assessment of bladder emptying | 41 | $193 | $5 |
| Telephone medical discussion provided by nonphysician professional, 5-10 minutes | 12 | $158 | $12 |
Procedures Medicare counted
| Melanoma (skin cancer) excision | 1-10 | None |
| Prostate resection | 28 | More than 89% of doctors who do this |
Who their Medicare patients are
393 Original Medicare patients in 2024. Average age 75 · Under 65 7% · 85 and older 13% · Women 27% · Also on Medicaid 26% · Health risk score 1.70. Above the middle of the specialty; the typical urology clinician is at 1.36.
Conditions among them: High blood pressure 72% · Diabetes 32% · Coronary heart disease 32% · Chronic kidney disease 28% · Cancer 25% · Atrial fibrillation 24% · Depression 18% · Heart failure 16% · Stroke 12% · COPD 11% · Dementia 9%.
The office billed $1,444,005, Medicare allowed $166,728 and paid $126,184; for 2,642 services of 58 kinds; $4,308 of it was for drugs given in the office and $121,876 for care.
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 | 393 | 2,642 | 75 | 1.70 | $1,444,005 | $126,184 |
| 2023 | 227 | 632 | 74 | 1.56 | $540,572 | $67,891 |
| 2022 | 68 | 85 | 74 | 1.37 | $91,298 | $8,728 |
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
2023: 16 services
| New patient visit (45+ min) | 105 | $16,323 | $155 |
| Diagnostic exam of bladder and urethra using an endoscope | 31 | $7,520 | $243 |
| Return visit (30+ min) | 54 | $7,217 | $122 |
| Complex measurement of pressure of urine flow in bladder with urethra pressure and voiding pressure studies | 17 | $6,596 | $388 |
| Short return visit (20+ min) | 43 | $3,913 | $87 |
| Long return visit (40+ min) | 20 | $3,407 | $162 |
| Insertion of device into abdomen with pressure and urine flow rate study | 16 | $3,150 | $197 |
| New patient visit (45+ min) | 26 | $2,453 | $94 |
| New patient visit (30+ min) | 17 | $1,818 | $107 |
| Diagnostic exam of bladder and urethra using an endoscope | 15 | $1,061 | $71 |
| Return visit (30+ min) | 16 | $971 | $61 |
| New patient visit (30+ min) | 18 | $970 | $54 |
| Telehealth originating site facility fee | 24 | $584 | $22 |
| Non-needle measurement and recording of electrical activity of muscles at bladder and bowel openings | 15 | $459 | $31 |
| Review by radiologist of urinary bladder image | 11 | $443 | $40 |
| Electronic assessment of bladder emptying | 28 | $134 | $5 |
2022: 2 services
| New patient visit (45+ min) | 46 | $5,596 | $122 |
| New patient visit (30+ min) | 13 | $970 | $75 |
Medicaid work
$1,754 in 2023
Medicaid paid $1,754 for 40 billed services this clinician did in 2023, up to 20 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.
| New patient visit (45+ min) | 40 | $1,754 |
| 2023 | 40 | 1 | 20 | $1,754 |
Drugs they prescribed that Part D paid
$97,481
Pharmacies billed $97,481 in 2024.
This is pharmacy cost, not the office bill, and not what patients paid.
Opioids were 0% of their Part D prescriptions (0 of 475) in 2024. At or below the middle of the specialty; the typical urology clinician is at 2%.
375 generic and fewer than 11 brand-name prescriptions · $97,481 in drug cost · 68 antibiotic prescriptions to 51 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.
| Myrbetriq | 80 | $74,026 | $925 |
| Tolterodine Tartrate Er | 12 | $1,730 | $144 |
| Tamsulosin | 105 | $1,663 | $16 |
| Solifenacin | 27 | $1,356 | $50 |
| Trospium Chloride | 26 | $877 | $34 |
See all 9 drugs
| Myrbetriq | 80 | $74,026 | $925 |
| Tolterodine Tartrate Er | 12 | $1,730 | $144 |
| Tamsulosin | 105 | $1,663 | $16 |
| Solifenacin | 27 | $1,356 | $50 |
| Trospium Chloride | 26 | $877 | $34 |
| Finasteride | 61 | $776 | $13 |
| Alfuzosin Hcl Er | 25 | $412 | $16 |
| Cephalexin | 21 | $185 | $9 |
| Amoxicillin-Clavulanate Potass | 15 | $153 | $10 |
Year by year
| 2024 | 475 | 188 | 0% (0) | None | $97,481 |
| 2023 | 342 | 134 | 0% (0) | None | $68,923 |
| 2022 | 74 | 45 | None | None | $5,008 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 8 drugs
| Myrbetriq | 73 | $42,997 | $589 |
| Premarin | 20 | $10,885 | $544 |
| Solifenacin | 18 | $2,501 | $139 |
| Finasteride | 50 | $1,298 | $26 |
| Tamsulosin | 63 | $1,191 | $19 |
| Alfuzosin Hcl Er | 12 | $220 | $18 |
| Amoxicillin-Clavulanate Potass | 11 | $109 | $10 |
| Cephalexin | 12 | $90 | $8 |
2022: 1 drug
| Tamsulosin | 16 | $172 | $11 |
Money from drug and device companies
$1,384 in 2025
| 2025 | 2 | 8 | None | $1,384 |
| 2024 | 1 | 2 | None | $121 |
| 2023 | 1 | 1 | None | $90 |
| 2022 | 1 | 1 | None | $16 |
Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.
A payment is not proof that care is biased.
| Boston Scientific | Lumenis Pulse 120h | $769 | 6 payments
|
| Intuitive Surgical | Da Vinci Surgical System | $615 | 2 payments
|
See all 8 published payments
| Intuitive Surgical | Travel · 2025-12-23 | Da Vinci Surgical System | $596 |
| Intuitive Surgical | Travel · 2025-12-23 | Da Vinci Surgical System | $19 |
| Boston Scientific | Meals · 2025-07-14 | Moses | $137 |
| Boston Scientific | Travel · 2025-03-27 | Lumenis Pulse 120h | $270 |
| Boston Scientific | Travel · 2025-03-27 | Lumenis Pulse 120h | $57 |
| Boston Scientific | Meals · 2025-01-24 | Lumenis Pulse 120h | $23 |
| Boston Scientific | Travel · 2025-01-23 | Lumenis Pulse 120h | $209 |
| Boston Scientific | Meals · 2025-01-23 | Lumenis Pulse 120h | $73 |
See earlier years (2024, 2023, 2022)
2024: $121
| Boston Scientific | Lithovue | $121 | 2 payments
|
2023: $90
| UroGen Pharma | Jelmyto | $90 | 1 payment
|
2022: $16
| Boston Scientific | 8/10 Dilator/Sheath Set | $16 | 1 payment
|
Checkups this office reported
Medicare did not publish checkup rates for this clinician.
- Medicare’s overall office score
- 76.5 / 100
- Scores the office’s reporting and systems. It is not a grade for how the doctor treats you.
Professional record
- NPI
- 1891430807
- Licence
- CA A177263California A177263: Current · expires 2028-03-31
- Trained
- University of Toronto, Faculty of Medicine, 2017
- Group
- Stanford Health Care
- Video visits
- Lists video visits
- Gender
- Male
More record details
- Sole proprietor
- No
- Taxonomy
- Urology (208800000X)
- Mailing address
- 300 Pasteur Dr, Stanford, CA, 94305
- NPI first listed
- 2022-05-03
- NPI last updated
- 2024-03-14
- NPI record certified
- 2024-03-14
This is when the NPI record was last certified, not a medical board exam.