Louis Chang, MD

3 locations · Northern California Retina Vitreous Associates Medical Group, Inc. · 7 clinicians in this group

Hospitals listed: Good Samaritan Hospital · Mills-Peninsula Medical Center. That is not proof they admit you there this week.

34 plans · 9 carriers

Licence A91494 · Current

Licensed to practise in California · since 2013 · expires 2028-06-30 · Washington University School of Medicine.

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

2 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
• Peninsula Medical CenterBurlingame, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of Sutter Health, which runs 27 hospitals in 2 statesPatients rate it 4 of 5 · 78% would definitely recommend it
  Overall rating: 5 of 5 starsBetter than the national rate — Catheter Associated Urinary Tract Infections (ICU + select Wards): 0.139, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.242, Oct 2024 – Sep 2025

$2,333,151

Medicare paid this office $2,333,151 for 660 people.

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

Procedures Medicare counted

Who their Medicare patients are

660 Original Medicare patients in 2024. Average age 79 · Under 65 4% · 85 and older 28% · Women 61% · Also on Medicaid 25% · Health risk score 1.50. Above the middle of the specialty; the typical ophthalmology clinician is at 1.16.

Conditions among them: High blood pressure 75% · Diabetes 35% · Chronic kidney disease 29% · Coronary heart disease 24% · Atrial fibrillation 19% · Heart failure 18% · Cancer 16% · COPD 12% · Depression 12% · Dementia 7% · Stroke 7%.

The office billed $7,132,893, Medicare allowed $2,974,130 and paid $2,333,151; for 23,664 services of 32 kinds; $1,862,009 of it was for drugs given in the office and $471,142 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

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.

$597,294 in 2024

Medicaid paid $597,294 for 2,706 billed services this clinician did in 2024, up to 63 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.

$8,660

Pharmacies billed $8,660 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 217) in 2024. At or below the middle of the specialty; the typical ophthalmology clinician is at 0%.

127 generic and 90 brand-name prescriptions · $8,660 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.

$134 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

1538295720

Licence

CA A91494California A91494: Current · expires 2028-06-30

Trained

University of Washington School of Medicine, 2003

Group

Northern California Retina Vitreous Associates Medical Group, Inc.

Gender

Male