William D. Keen Jr, MD

Medicare activity in 2024

Official CMS public-use data for William D. Keen Jr, 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. Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)394 services
2. Injection, octafluoropropane microspheres, per ml (Q9956)299 services
3. Injection, sulfur hexafluoride lipid microspheres, per ml (Q9950)75 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)67 services
5. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)54 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%
• Arthritis50%
• Ischemic heart disease50%
• Heart failure48%
• Chronic kidney disease40%

Hospitals where William D. Keen Jr works

Medicare's Facility Affiliation Data lists William D. Keen Jr 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.

• UC San Diego Health Hillcrest - Hillcrest Medical CenterSan Diego, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050025

Practice locations

Addresses where William D. Keen Jr is enrolled with Medicare (CMS data updated October 2, 2026).

• 200 W Arbor DrSan Diego, CA 92103 (858) 657‑7000
• 3900 5th Ave, Suite 110San Diego, CA 92103 (858) 554‑1212

Group practices

Medicare enrollment lists William D. Keen Jr as a member of these groups (CMS data updated October 2, 2026).

• Regents of the University of California2,089 clinicians in the group
• Monica Perlman MD Inc364 clinicians in the group

Specialties

• Internal Medicineprimary
• Cardiovascular Disease (Cardiology)also

Find other Internal Medicine doctors in California →

Other internal medicine doctors in San Diego

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

• Anthony Adeosun, DO
• Mitalie Gupta, MD
• Jennifer Barkley, MD
• Melissa A. Wong, MD
• Xing Jian Ren, MD
• Alexander Shpaner, MD
• Vicente Diaz-Gonzalez, MD
• Vidya Panguluri, MD

All internal medicine doctors in San Diego →

Other clinicians in Regents of the University of California

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

• Libna Z. Palma, OD
• Will E. Toperoff, NP
• Nikdokht Farid, MD
• Emily A. Meier, CP
• Jay H. Park, MD
• Jennifer A. Berumen, 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