Lester S. Holstein Iii, MD

Medicare activity in 2024

Official CMS public-use data for Lester S. Holstein Iii, 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)387 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)372 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)97 services
4. Routine electrocardiogram (ecg) using at least 12 leads with tracing (93005)23 services
5. Administration of influenza virus vaccine (G0008)20 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 cholesterol74%
• High blood pressure73%
• Arthritis48%
• Diabetes22%
• Ischemic heart disease22%
• Chronic kidney disease21%

Hospitals where Lester S. Holstein Iii works

Medicare's Facility Affiliation Data lists Lester S. Holstein Iii 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.

• Casa Colina HospitalPomona, CA · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 050782
• Pomona Valley Hospital Medical CenterPomona, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050231
• San Antonio Regional HospitalUpland, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050099

Practice locations

Addresses where Lester S. Holstein Iii is enrolled with Medicare (CMS data updated October 2, 2026).

• 1601 Monte Vista Ave, Suite 190Claremont, CA 91711 (909) 865‑9977
• 1770 N Orange Grove Ave, Suite 101Pomona, CA 91767 (909) 469‑9494

Group practices

Medicare enrollment lists Lester S. Holstein Iii as a member of this group (CMS data updated October 2, 2026).

• Premier Family Medicine Associates, Inc65 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in California →

Other family doctors in Claremont

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

• Jessica M. Ngo, MD
• Maria Tolentino, DO
• Stefan T. Reynoso, MD
• Alan P. Ung, MD
• Van Dinh, DO
• Gary P. Fontan, MD
• Nicholle A. Henley, DO
• Neomal Muthumala, DO

All family doctors in Claremont →

Other clinicians in Premier Family Medicine Associates, Inc

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

• Roy A. Guizado, PA
• Ryan H. Agena, DO
• Jose E. Ramos, MD
• Maria Tolentino, DO
• Michael D. Deanda, MD
• Christine J. Kwon, 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