Diane Ashley Mar, MD

1 location · County of Santa Clara · 1,000 clinicians in this group

Hospitals listed: Santa Clara Valley Medical Center · Stanford Health Care. That is not proof they admit you there this week.

19 plans · 4 carriers

Licence A161922 · Current

Licensed to practise in California · since 2019 · expires 2027-04-30 · University of Nevada, Reno 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.

• Santa Clara Valley Medical CenterSan Jose, CAAcute Care Hospital · Government - Local · Has an emergency department · Birthing-friendlyPart of Santa Clara Valley Health and Hospital System, which runs 3 hospitalsPatients rate it 3 of 5 · 70% would definitely recommend it
  Overall rating: 2 of 5 starsWorse than the national rate — SSI - Colon Surgery: 2.572, Oct 2024 – Sep 2025Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.563, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.256, Oct 2024 – Sep 2025Better than the national rate — MRSA Bacteremia: 0.369, 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

$12,677

Medicare paid this office $12,677 for 87 people.

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

Who their Medicare patients are

87 Original Medicare patients in 2024. Average age 71 · Women 64% · Also on Medicaid 30% · Health risk score 1.84. Sicker patients than 9 in 10 peers; the typical rheumatology clinician is at 1.38.

Conditions among them: High blood pressure 74% · Coronary heart disease 31% · Chronic kidney disease 30% · Diabetes 26% · Heart failure 25% · COPD 25% · Depression 24% · Atrial fibrillation 20% · Cancer 17% · Stroke 13%.

The office billed $66,982, Medicare allowed $17,127 and paid $12,677; for 161 services of 19 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.

$619,776

Pharmacies billed $619,776 in 2024.

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

Opioids were 4% of their Part D prescriptions (12 of 278) in 2024. Above the middle of the specialty; the typical rheumatology clinician is at 3%.

217 generic and 61 brand-name prescriptions · $619,776 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.

$93 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

1356704795

Licence

CA A161922California A161922: Current · expires 2027-04-30

Trained

University of Nevada School of Medicine, 2016

Group

County of Santa Clara

Video visits

Lists video visits

Gender

Female