William F. Nicholson, MD

Medicare activity in 2024

Official CMS public-use data for William F. Nicholson, 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. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)780 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)497 services
3. Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)67 services
4. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)37 services
5. Telephone medical discussion with physician, 21-30 minutes (99443)22 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%
• Diabetes53%
• Arthritis51%
• Chronic kidney disease49%
• Ischemic heart disease47%

Hospitals where William F. Nicholson works

Medicare's Facility Affiliation Data lists William F. Nicholson 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.

• Washington HospitalFremont, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050195

Practice locations

Addresses where William F. Nicholson is enrolled with Medicare (CMS data updated October 2, 2026).

• 2000 Mowry AveFremont, CA 94538 (510) 797‑1111
• 2557 Mowry AveFremont, CA 94538 (510) 745‑8100

Group practices

Medicare enrollment lists William F. Nicholson as a member of this group (CMS data updated October 2, 2026).

• Washington Township Hospital District28 clinicians in the group

Specialties

• Cardiovascular Disease (Cardiology)primary

Find other Cardiovascular Disease (Cardiology) doctors in California →

Other cardiologists in Fremont

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

• Gurcharan Reen, MD
• Grace S. Liu, MD
• Carl J. Carlson, MD
• Scott H. Yang, MD
• Paul L. Ludmer, MD
• Kevin D. Bauer, MD
• Timothy Tsoi, MD
• Xinge Hu, MD

All cardiologists in Fremont →

Other clinicians in Washington Township Hospital District

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

• Gurcharan Reen, MD
• Carl J. Carlson, MD
• Prabhjot S. Khalsa, MD
• Charan Singh, MD
• Timothy Tsoi, MD
• Steven S. Song, 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