Louie-Marc G. Contreras, MD

Medicare activity in 2024

Official CMS public-use data for Louie-Marc G. Contreras, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)97 services
2. Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)81 services
3. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)42 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)37 services
5. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)21 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%
• Arthritis64%
• Ischemic heart disease40%
• Depression38%
• Diabetes37%

Hospitals where Louie-Marc G. Contreras works

Medicare's Facility Affiliation Data lists Louie-Marc G. Contreras 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.

• Glendale Memorial Hospital & Health CenterGlendale, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050058
• Henry Mayo Newhall HospitalValencia, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050624

Practice locations

Addresses where Louie-Marc G. Contreras is enrolled with Medicare (CMS data updated October 2, 2026).

• 225 W Broadway, Suite 100Glendale, CA 91204 (818) 545‑7117
• 23845 McBean PkwyValencia, CA 91355 (661) 253‑8000
• 27420 Tourney Rd, Suite 210Valencia, CA 91355 (661) 253‑1353
• 824 E Carson St, Suite 104Carson, CA 90745 (310) 830‑9706

Group practices

Medicare enrollment lists Louie-Marc G. Contreras as a member of these groups (CMS data updated October 2, 2026).

• Healthcare Partners Affiliates Medical Group754 clinicians in the group
• Henry Mayo Newhall Memorial Hospital18 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in California →

Other general surgeons in Glendale

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

• Johanna V. Basa, MD
• Jack P. Silva, MD
• Faisal A. Khan, MD
• Gevorg A. Mutafyan, MD
• David Foulad, MD
• Jonathan Jimenez, DO
• On Wang, MD
• Subarna Biswas, MD

All general surgeons in Glendale →

Other clinicians in Healthcare Partners Affiliates Medical Group

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

• Glen J. Barbee, MD
• Andrew D. Karas, MD
• Lianne B. Coulter, PA
• Dong C. Trang, DO
• Bethesda Y. Gee, MD
• Jill B. Samovar, 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