Tara I Hsin Chang, MD

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

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

15 plans · 4 carriers

Licence A90280 · Current

Licensed to practise in California · since 2005 · expires 2028-10-31 · University of Michigan Medical School.

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

What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.

Specialty certification

• American Board of Internal Medicine - Internal Medicine
• American Board of Internal Medicine - Nephrology

2 hospitals

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 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

$48,901

Medicare paid this office $48,901 for 208 people.

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

Who their Medicare patients are

208 Original Medicare patients in 2024. Average age 72 · Under 65 17% · 85 and older 13% · Women 50% · Also on Medicaid 29% · Health risk score 3.34. At or below the middle of the specialty; the typical nephrology clinician is at 4.01.

Conditions among them: High blood pressure 75% · Chronic kidney disease 75% · Diabetes 49% · Coronary heart disease 46% · Heart failure 40% · Atrial fibrillation 35% · Depression 25% · Cancer 21% · Stroke 20% · COPD 19% · Dementia 14%.

The office billed $221,631, Medicare allowed $64,360 and paid $48,901; for 583 services of 22 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.

$5,021 in 2023

Medicaid paid $5,021 for 130 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.

$206,472

Pharmacies billed $206,472 in 2024.

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

514 generic and 143 brand-name prescriptions · $206,472 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.

$11,846 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.

Research money

Money a company paid to run a study. Where it went to their institution, the clinician is named as an investigator and did not receive it; the amount covers the whole study, often across many sites.

Medicare did not publish checkup rates for this clinician.

NPI

1437166592

Licence

CA A90280California A90280: Current · expires 2028-10-31

Trained

University of Michigan Medical School, 2003 · 23 years ago

Group

Stanford Health Care

Video visits

Lists video visits

Gender

Female