Monica C. Abreu Diaz, MD

Medicare activity in 2024

Official CMS public-use data for Monica C. Abreu Diaz, 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. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)274 services
2. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)127 services
3. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)46 services
4. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)38 services
5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)37 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 cholesterol75%
• High blood pressure73%
• Arthritis54%
• Diabetes32%
• Depression32%
• Anxiety30%

Hospitals where Monica C. Abreu Diaz works

Medicare's Facility Affiliation Data lists Monica C. Abreu Diaz 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.

• Ronald Reagan UCLA Medical CenterLos Angeles, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050262

Practice locations

Addresses where Monica C. Abreu Diaz is enrolled with Medicare (CMS data updated October 2, 2026).

• 5205 Melrose AveLos Angeles, CA 90038 (323) 653‑1990

Group practices

Medicare enrollment lists Monica C. Abreu Diaz as a member of this group (CMS data updated October 2, 2026).

• The Los Angeles Free Clinic26 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Los Angeles

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

• Babak Pezeshki
• Julia M. Hoffer, DO
• Qiuxue T. Tan, MD
• Maurice Mehrban, MD
• Mark A. Aminzadeh, MD
• Michael Y. Karapetian, MD
• Michael D. Borookhim, MD
• Eric Esrailian, MD

All internal medicine doctors in Los Angeles →

Other clinicians in The Los Angeles Free Clinic

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

• Sierra R. Murphy, CSW
• Farshid Fararooy, MD
• Carlos J. Silva Lynch, MD
• Allison A. Nuques
• Reihaneh Chokhachi Zadeh Moghadam, MD
• Gloria J. Hong, 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