Maria Montoya, MD

Medicare activity in 2024

Official CMS public-use data for Maria Montoya, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Emergency department visit with high level of medical decision making (99285)341 services
2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)327 services
3. Emergency department visit with moderate level of medical decision making (99284)90 services
4. Critical care, first 30-74 minutes (99291)78 services
5. Emergency department visit with low level of medical decision making (99283)13 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Arthritis69%
• Ischemic heart disease51%
• Diabetes49%
• Depression44%

Hospitals where Maria Montoya works

Medicare's Facility Affiliation Data lists Maria Montoya at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Foothill Regional Medical CenterTustin, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050780
• USC Verdugo Hills HospitalGlendale, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050124

Practice locations

Addresses where Maria Montoya is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 7; the Medicare profile lists all.

• 14662 Newport AveTustin, CA 92780 (714) 619‑7700
• 1520 San Pablo StLos Angeles, CA 90033 (800) 872‑2273
• 1520 San Pablo St, Fl 4Los Angeles, CA 90033 (800) 872‑2273
• 1520 San Pablo St 1st Floor NLos Angeles, CA 90033 (800) 872‑2273
• 1812 Verdugo BlvdGlendale, CA 91208 (818) 790‑7100

Group practices

Medicare enrollment lists Maria Montoya as a member of these groups (CMS data updated October 2, 2026).

• USC Care Medical Group Inc1,380 clinicians in the group
• Premier Health Partners18 clinicians in the group
• Oc Emergency Physicians13 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Tustin

Clinicians with the same Medicare primary specialty in Tustin, CA — not a recommendation.

• John Jiao, MD
• John J. Fosbinder, DO
• Christopher C. Ng, MD
• Frank Fower, MD
• Viet Q. Vuong, DO
• Tanya M. Dall, MD

All emergency medicine doctors in Tustin →

Other clinicians in USC Care Medical Group Inc

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Marshall Yuan, MD
• Lena F. Holt
• Darryl K. Shibata, MD
• Houda Boucekkine, MD
• John C. Chen, MD
• Cynthia Cherfane, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians