Leo R. Leer, MD

Medicare activity in 2024

Official CMS public-use data for Leo R. Leer, 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. Insertion of needle into vein for collection of blood sample (36415)1,745 services
2. Blood test, comprehensive group of blood chemicals (80053)1,051 services
3. Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)814 services
4. Blood test, lipids (cholesterol and triglycerides) (80061)653 services
5. Hemoglobin a1c level (83036)481 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 cholesterol72%
• High blood pressure70%
• Arthritis41%
• Diabetes26%
• Chronic kidney disease22%
• Atrial fibrillation19%

Hospitals where Leo R. Leer works

Medicare's Facility Affiliation Data lists Leo R. Leer 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.

• Providence St Joseph HospitalEureka, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050006

Practice locations

Addresses where Leo R. Leer is enrolled with Medicare (CMS data updated October 2, 2026).

• 200 W Ctr St PromenadeAnaheim, CA 92805
• 2280 Harrison AveEureka, CA 95501 (707) 443‑9371
• 2700 Dolbeer StEureka, CA 95501 (707) 445‑8121
• 2710 Dolbeer StEureka, CA 95501 (707) 267‑2060
• 500 Doyle Park DrSanta Rosa, CA 95405

Group practices

Medicare enrollment lists Leo R. Leer as a member of this group (CMS data updated October 2, 2026).

• Providence Medical Foundation1,466 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in California →

Other family doctors in Anaheim

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

• Fe A. Inocentes, MD
• Yen Phan, DO
• Christine Yu, DO
• Amir Goharbin, MD
• Karen Khin, MD
• Hayoon Kim, MD
• Gregory P. Rosa, MD
• Paul H. Chu, DO

All family doctors in Anaheim →

Other clinicians in Providence Medical Foundation

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

• Jong W. Park, MD
• Sherwin Abdoli, MD
• Cody L. Bach, NP
• Bashar M. Shahatit, MD
• Eric O. Benner, MD
• Kiarash Khajavi, 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