Susan R. Tan, MD

Medicare activity in 2024

Official CMS public-use data for Susan R. Tan, 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)31 services
2. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)13 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 pressure70%
• Diabetes64%
• Arthritis53%
• Ischemic heart disease38%
• Heart failure26%

Hospitals where Susan R. Tan works

Medicare's Facility Affiliation Data lists Susan R. Tan 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.

• Barstow Community HospitalBarstow, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050298

Practice locations

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

• 1454 E 2nd StSan Bernardino, CA 92408 (909) 382‑7100
• 705 E Virginia Way, Suite IBarstow, CA 92311 (760) 255‑3900

Group practices

Medicare enrollment lists Susan R. Tan as a member of these groups (CMS data updated October 2, 2026).

• Sac Health System227 clinicians in the group
• Chao and Tan Medical Group Inc2 clinicians in the group

Specialties

• Obstetrics/Gynecologyprimary

Find other Obstetrics/Gynecology doctors in California →

Other OB-GYNs in San Bernardino

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

• Stephanie S. Larson, MD
• Ronald B. Johnson, MD
• Daniel P. Lopez, MD
• Chang Li Lee, MD
• Lenorre R. Clarke, MD
• Likang Chao, MD
• Kristina E. Mercado, MD
• Ivan Rybkin, MD

All OB-GYNs in San Bernardino →

Other clinicians in Sac Health System

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

• Lindy M. Legoh, NP
• Kevin C. Shannon, MD
• Rian J. Blackwood, DO
• Jason Lohr, MD
• Steven M. Fish, MD
• Kwame B. Agyeman, 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