Christianna Chorong Sim, MD

1 location

Hospitals listed: Santa Monica - UCLA Med Ctr & Orthopaedic Hospital · Stanford Health Care · UCLA West Valley Medical Center. That is not proof they admit you there this week.

Licence A185926 · Current

Licensed to practise in California · since 2023 · expires 2027-07-31 · State University of New York Health Science Center at Brooklyn.

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.

• Santa Monica - UCLA Med Ctr & Orthopaedic HospitalSanta Monica, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency department · Birthing-friendlyPart of University of California Health, which runs 12 hospitalsPatients rate it 3 of 5 · 75% would definitely recommend it
  Overall rating: 5 of 5 starsBetter than the national rate — Pressure ulcer rate: 0.09 (0 to 0.59) · 6,805 cases, Jul 2022 – Jun 2024Better than the national rate — Clostridium Difficile (C.Diff): 0.667, Oct 2024 – Sep 2025Better than the national rate — Ratio of unplanned hospital visits after hospital outpatient surgery: 0.8 (0.6 to 1) · 1,274 cases, Jan 2024 – Dec 2024
• 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
• UCLA West Valley Medical CenterWest Hills, CAAcute Care Hospital · Proprietary · Has an emergency departmentPart of HCA Healthcare, which runs 185 hospitals in 19 statesPatients rate it 1 of 5 · 53% would definitely recommend it
  Overall rating: 2 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0.454, Oct 2024 – Sep 2025

$49,896

Medicare paid this office $49,896 for 352 people.

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

Who their Medicare patients are

352 Original Medicare patients in 2024. Average age 75 · Under 65 11% · 85 and older 19% · Women 54% · Also on Medicaid 30% · Health risk score 2.03. Above the middle of the specialty; the typical emergency medicine clinician is at 2.01.

Conditions among them: High blood pressure 75% · Coronary heart disease 42% · Chronic kidney disease 37% · Diabetes 32% · Heart failure 32% · Atrial fibrillation 28% · Depression 27% · Cancer 23% · COPD 20% · Dementia 17% · Stroke 17%.

The office billed $330,669, Medicare allowed $66,003 and paid $49,896; for 411 services of 23 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.

$41,565 in 2024

Medicaid paid $41,565 for 397 billed services this clinician did in 2024, up to 36 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.

$3,139

Pharmacies billed $3,139 in 2024.

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

74 generic and fewer than 11 brand-name prescriptions · $3,139 in drug cost · 29 antibiotic prescriptions to 23 people.

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.

NPI

1396235743

Licence

CA A185926California A185926: Current · expires 2027-07-31