Alexandra G. Castillejos Ellenthal, MD

Medicare activity in 2024

Official CMS public-use data for Alexandra G. Castillejos Ellenthal, 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 low level od decision making, if using time, 20 minutes or more (99213)88 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)86 services
3. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)71 services
4. Imaging of optic nerve (92133)66 services
5. Photography of the retina (92250)57 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%
• Arthritis48%
• Diabetes35%
• Chronic kidney disease27%
• Anxiety23%

Hospitals where Alexandra G. Castillejos Ellenthal works

Medicare's Facility Affiliation Data lists Alexandra G. Castillejos Ellenthal 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.

• Scripps Mercy HospitalSan Diego, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050077
• Sharp Chula Vista Medical CenterChula Vista, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050222

Practice locations

Addresses where Alexandra G. Castillejos Ellenthal is enrolled with Medicare (CMS data updated October 2, 2026).

• 342 F StChula Vista, CA 91910 (619) 422‑1471

Group practices

Medicare enrollment lists Alexandra G. Castillejos Ellenthal as a member of this group (CMS data updated October 2, 2026).

• Castillejos Eye Institute Medical Group6 clinicians in the group

Specialties

• Ophthalmologyprimary

Find other Ophthalmology doctors in California →

Other ophthalmologists in Chula Vista

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

• Alexander I. Zabaneh, MD
• Veena V. Arun, MD
• Mary A. Sullivan, MD
• Jessica S. Maslin, MD
• Majid Mani, MD
• Martin Rajsbaum, MD
• Gary Jacobs, MD
• Mauricio E. Pons, MD

All ophthalmologists in Chula Vista →

Other clinicians in Castillejos Eye Institute Medical Group

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

• David Castillejos, MD
• Duane M. Bryant, 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