Jiwoon Chang, MD

1 location · Stanford Health Care · 3,152 clinicians in this group

Hospitals listed: Good Samaritan Hospital · Stanford Health Care · Stanford Health Care Tri-Valley. That is not proof they admit you there this week.

13 plans · 2 carriers

Licence A154679 · Current

Licensed to practise in California · since 2018 · expires 2028-03-31 · David Geffen School of Medicine at UCLA.

No disciplinary actions, convictions, malpractice judgments or citations in this record.

3 hospitals

These rate the hospital, not this clinician. Most measures at most hospitals are no different from the national rate.

• Good Samaritan HospitalSan Jose, CAAcute Care Hospital · Proprietary · Has an emergency department · Birthing-friendlyPart of HCA Healthcare, which runs 185 hospitals in 19 statesPatients rate it 2 of 5 · 67% would definitely recommend it
  Overall rating: 2 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0.337, Oct 2024 – Sep 2025
• 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 it
  Overall 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
• Stanford Health Care Tri-ValleyPleasanton, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of Stanford Health Care, which runs 3 hospitalsPatients rate it 3 of 5 · 74% would definitely recommend it
  Overall rating: 5 of 5 starsBetter than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.178, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.237, Oct 2024 – Sep 2025

$92,480

Medicare paid this office $92,480 for 334 people.

This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.

Procedures Medicare counted

Who their Medicare patients are

334 Original Medicare patients in 2024. Average age 73 · Under 65 9% · 85 and older 11% · Women 58% · Also on Medicaid 29% · Health risk score 2.35. Above the middle of the specialty; the typical pulmonary disease clinician is at 2.13.

Conditions among them: High blood pressure 75% · Cancer 52% · Chronic kidney disease 36% · COPD 35% · Coronary heart disease 34% · Diabetes 33% · Atrial fibrillation 27% · Heart failure 26% · Depression 22% · Stroke 13% · Dementia 10%.

The office billed $2,376,061, Medicare allowed $117,427 and paid $92,480; for 1,218 services of 46 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

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.

$7,092 in 2024

Medicaid paid $7,092 for 98 billed services this clinician did in 2024, up to 17 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.

$12,603

Pharmacies billed $12,603 in 2024.

This is pharmacy cost, not the office bill, and not what patients paid.

27 generic and 46 brand-name prescriptions · $12,603 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.

Year by year

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

$31,782 in 2025

Paid work is consulting, speaking, honoraria and royalties, as opposed to meals and travel.

A payment is not proof that care is biased.

Medicare did not publish checkup rates for this clinician.

NPI

1952780694

Licence

CA A154679California A154679: Current · expires 2028-03-31

Trained

University of California, Geffen School of Medicine, 2015

Group

Stanford Health Care

Video visits

Lists video visits

Gender

Male