Stephen Chang, MD
Cardiovascular Disease (Cardiology) · 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
Looking this up.
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. Chang’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 A130712 · Current
Licensed to practise in California · since 2014 · expires 2027-12-31 · University of Cincinnati College 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
$16,424
Medicare paid this office $16,424 for 135 people.
This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.
| Return visit (30+ min) | 38 | $2,902 | $73 |
| Short return visit (20+ min) | 39 | $2,195 | $51 |
| Initial hospital care with straightforward or low-level medical decision making at least 55 minutes | 14 | $1,636 | $117 |
| Short return visit (20+ min) | 15 | $1,314 | $88 |
| Hospital discharge day management, more than 30 minutes | 12 | $1,259 | $105 |
See all 7 services
| Return visit (30+ min) | 38 | $2,902 | $73 |
| Short return visit (20+ min) | 39 | $2,195 | $51 |
| Initial hospital care with straightforward or low-level medical decision making at least 55 minutes | 14 | $1,636 | $117 |
| Short return visit (20+ min) | 15 | $1,314 | $88 |
| Hospital discharge day management, more than 30 minutes | 12 | $1,259 | $105 |
| New patient visit (60+ min) | 11 | $1,240 | $113 |
| Hospital discharge day management, 30 minutes or less | 11 | $819 | $74 |
Who their Medicare patients are
135 Original Medicare patients in 2024. Average age 78 · Women 47% · Also on Medicaid 31% · Health risk score 1.71. At or below the middle of the specialty; the typical cardiology clinician is at 1.71.
Conditions among them: High blood pressure 75% · Coronary heart disease 42% · Diabetes 39% · Atrial fibrillation 37% · Heart failure 35% · Chronic kidney disease 35% · Cancer 20% · COPD 14% · Dementia 13% · Depression 12% · Stroke 11%.
The office billed $59,753, Medicare allowed $22,957 and paid $16,424; for 211 services of 18 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 | 135 | 211 | 78 | 1.71 | $59,753 | $16,424 |
| 2023 | 135 | 262 | 77 | 1.81 | $69,104 | $20,945 |
| 2022 | 167 | 307 | 76 | 2.27 | $103,510 | $23,418 |
| 2021 | 98 | 158 | 75 | 1.77 | $51,284 | $13,136 |
| 2020 | 110 | 160 | 75 | 2.58 | $41,857 | $9,546 |
| 2019 | 68 | 124 | 75 | 1.90 | $15,198 | $8,328 |
| 2018 | 54 | 106 | 74 | 1.68 | $12,995 | $8,248 |
| 2017 | 11 | 21 | 74 | 1.59 | $3,837 | $1,876 |
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: 9 services
| Return visit (30+ min) | 42 | $3,841 | $78 |
| Initial hospital care with straightforward or low-level medical decision making at least 55 minutes | 24 | $2,870 | $120 |
| Subsequent hospital care with moderate levelof medical decision making at least 35 minutes | 20 | $2,554 | $73 |
| New patient visit (60+ min) | 13 | $2,138 | $164 |
| Hospital discharge day management, more than 30 minutes | 18 | $1,928 | $107 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day at least 25 minutes | 18 | $1,897 | $45 |
| Long return visit (40+ min) | 11 | $1,729 | $133 |
| Short return visit (20+ min) | 25 | $1,347 | $45 |
| Hospital discharge day management, 30 minutes or less | 14 | $1,063 | $76 |
2022: 7 services
| Return visit (30+ min) | 46 | $4,481 | $77 |
| Initial hospital care with straightforward or low-level medical decision making at least 55 minutes | 29 | $3,588 | $124 |
| Short return visit (20+ min) | 43 | $2,650 | $60 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day at least 25 minutes | 32 | $2,024 | $35 |
| Initial hospital care with straightforward or low level of medical decision making, per day at least 40 minutes | 18 | $1,646 | $91 |
| Hospital discharge day management, more than 30 minutes | 16 | $1,557 | $97 |
| Subsequent hospital care with moderate levelof medical decision making at least 35 minutes | 17 | $1,425 | $65 |
2021: 4 services
| Return visit (30+ min) | 42 | $4,702 | $82 |
| Long return visit (40+ min) | 12 | $1,672 | $129 |
| Initial hospital care with straightforward or low level of medical decision making, per day at least 40 minutes | 17 | $1,566 | $92 |
| Short return visit (20+ min) | 19 | $893 | $41 |
2020: 4 services
| Subsequent hospital care with moderate levelof medical decision making at least 35 minutes | 40 | $2,910 | $68 |
| Return visit (30+ min) | 21 | $1,621 | $65 |
| Short return visit (20+ min) | 28 | $1,306 | $40 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day at least 25 minutes | 14 | $695 | $37 |
2019: 2 services
| Return visit (30+ min) | 52 | $5,049 | $63 |
| New patient visit (45+ min) | 14 | $1,264 | $90 |
2018: 2 services
| Return visit (30+ min) | 40 | $4,830 | $68 |
| New patient visit (45+ min) | 19 | $2,075 | $109 |
Drugs they prescribed that Part D paid
$106,681
Pharmacies billed $106,681 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 578) in 2024. At or below the middle of the specialty; the typical cardiology clinician is at 0%.
489 generic and 89 brand-name prescriptions · $106,681 in drug cost.
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.
| Eliquis | 41 | $58,878 | $1,436 |
| Xarelto | 19 | $19,789 | $1,042 |
| Metoprolol | 94 | $1,326 | $14 |
| Atorvastatin | 77 | $780 | $10 |
| Ezetimibe | 22 | $488 | $22 |
See all 13 drugs
| Eliquis | 41 | $58,878 | $1,436 |
| Xarelto | 19 | $19,789 | $1,042 |
| Metoprolol | 94 | $1,326 | $14 |
| Atorvastatin | 77 | $780 | $10 |
| Ezetimibe | 22 | $488 | $22 |
| Rosuvastatin | 21 | $381 | $18 |
| Amlodipine Besylate | 47 | $380 | $8 |
| Losartan | 32 | $340 | $11 |
| Lisinopril | 37 | $265 | $7 |
| Lovastatin | 12 | $147 | $12 |
| Carvedilol | 17 | $112 | $7 |
| Hydrochlorothiazide | 18 | $59 | $3 |
| Furosemide | 11 | $57 | $5 |
Year by year
| 2024 | 578 | 105 | 0% (0) | 15% | $106,681 |
| 2023 | 432 | 81 | 0% (0) | 13% | $74,142 |
| 2022 | 394 | 73 | 0% (0) | 16% | $75,248 |
| 2021 | 338 | 60 | 0% (0) | 18% | $61,938 |
| 2020 | 246 | 41 | 0% (0) | 16% | $35,245 |
| 2019 | 179 | 40 | 0% (0) | 20% | $24,185 |
| 2018 | 95 | 28 | 0% (0) | 17% | $7,690 |
| 2017 | 17 | None | 0% (0) | None | $1,846 |
| 2014 | 80 | 17 | None | None | $2,484 |
| 2013 | 50 | 11 | None | None | $1,971 |
Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.
See the drugs prescribed each year
2023: 13 drugs
| Eliquis | 31 | $44,853 | $1,447 |
| Xarelto | 14 | $12,790 | $914 |
| Metoprolol | 80 | $1,543 | $19 |
| Ezetimibe | 14 | $1,075 | $77 |
| Rosuvastatin | 12 | $960 | $80 |
| Losartan | 36 | $624 | $17 |
| Atorvastatin | 39 | $537 | $14 |
| Amlodipine Besylate | 38 | $379 | $10 |
| Nitroglycerin | 13 | $184 | $14 |
| Carvedilol | 15 | $181 | $12 |
| Lisinopril | 21 | $166 | $8 |
| Furosemide | 11 | $61 | $6 |
| Hydrochlorothiazide | 14 | $46 | $3 |
2022: 10 drugs
| Eliquis | 37 | $50,714 | $1,371 |
| Xarelto | 11 | $5,550 | $505 |
| Metoprolol | 63 | $1,240 | $20 |
| Rosuvastatin | 17 | $842 | $50 |
| Losartan | 34 | $804 | $24 |
| Clopidogrel | 16 | $400 | $25 |
| Atorvastatin | 26 | $357 | $14 |
| Amlodipine Besylate | 41 | $300 | $7 |
| Carvedilol | 15 | $277 | $18 |
| Lisinopril | 26 | $184 | $7 |
2021: 9 drugs
| Eliquis | 34 | $33,789 | $994 |
| Xarelto | 11 | $11,438 | $1,040 |
| Metoprolol | 40 | $657 | $16 |
| Atorvastatin | 27 | $527 | $20 |
| Losartan | 26 | $447 | $17 |
| Amlodipine Besylate | 48 | $360 | $7 |
| Carvedilol | 19 | $355 | $19 |
| Isosorbide Mononitrate Er | 12 | $167 | $14 |
| Lisinopril | 15 | $73 | $5 |
2020: 10 drugs
| Eliquis | 21 | $18,471 | $880 |
| Xarelto | 12 | $9,408 | $784 |
| Metoprolol | 31 | $439 | $14 |
| Atorvastatin | 19 | $334 | $18 |
| Losartan | 23 | $278 | $12 |
| Carvedilol | 26 | $276 | $11 |
| Metoprolol | 15 | $224 | $15 |
| Amlodipine Besylate | 25 | $162 | $6 |
| Lisinopril | 11 | $61 | $6 |
| Furosemide | 13 | $48 | $4 |
2019: 7 drugs
| Eliquis | 19 | $14,012 | $737 |
| Metoprolol | 24 | $691 | $29 |
| Atorvastatin | 19 | $345 | $18 |
| Carvedilol | 13 | $189 | $15 |
| Amlodipine Besylate | 16 | $138 | $9 |
| Lisinopril | 16 | $131 | $8 |
| Losartan | 13 | $122 | $9 |
2018: 2 drugs
| Metoprolol | 13 | $239 | $18 |
| Losartan | 14 | $126 | $9 |
Money from drug and device companies
$66 in 2025
| 2025 | 1 | 1 | None | $66 |
| 2024 | 1 | 3 | None | $260 |
| 2023 | 2 | 4 | None | $767 |
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 | Rhythmia Mapping System | $66 | 1 payment
|
See the published payment
| Boston Scientific | Meals · 2025-12-18 | Rhythmia Mapping System | $66 |
See earlier years (2024, 2023)
2024: $260
| Intuitive Surgical | Da Vinci Surgical System | $260 | 3 payments
|
2023: $767
| Intuitive Surgical | Da Vinci Surgical System | $506 | 2 payments
|
| Inspire Medical Systems | Inspire | $260 | 2 payments
|
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
- 1417240227
- Licence
- CA A130712California A130712: Current · expires 2027-12-31
- Trained
- University of Cincinnati College of Medicine, 2009
- Group
- Stanford Health Care
- Video visits
- Lists video visits
- Gender
- Male
More record details
- Sole proprietor
- No
- Taxonomy
- Cardiology (207RC0000X); Internal medicine (207R00000X)
- Mailing address
- 300 Pasteur Dr, Stanford, CA, 94305
- NPI first listed
- 2011-05-26
- NPI last updated
- 2024-04-14
- NPI record certified
- 2024-04-14
This is when the NPI record was last certified, not a medical board exam.