Karen J. Fong, MD

Medicare activity in 2024

Official CMS public-use data for Karen J. Fong, 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. Diagnostic exam of nasal passages using an endoscope (31231)328 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)290 services
3. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)100 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)20 services
5. Biopsy or removal of nasal polyp or tissue using an endoscope (31237)17 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 pressure60%
• Arthritis49%
• Asthma40%
• Ischemic heart disease25%
• Osteoporosis23%

Hospitals where Karen J. Fong works

Medicare's Facility Affiliation Data lists Karen J. Fong 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.

• John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050180
• Marian Regional Medical CenterSanta Maria, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050107
• Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441

Practice locations

Addresses where Karen J. Fong is enrolled with Medicare (CMS data updated October 2, 2026).

• 1505 Saint Alphonsus WayAlamo, CA 94507 (925) 932‑6330
• 2637 Shadelands DrWalnut Creek, CA 94598
• 365 Lennon LnWalnut Creek, CA 94598

Group practices

Medicare enrollment lists Karen J. Fong as a member of this group (CMS data updated October 2, 2026).

• Bass Medical Group291 clinicians in the group

Specialties

• Otolaryngologyprimary

Find other Otolaryngology doctors in California →

Other ENT doctors in Alamo

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

• Winston C. Vaughan, MD
• Joshua K. Au, MD
• Christina L. Corey, MD
• Benjamin Loos, MD
• Bassam Said, MD
• Lloyd C. Ford, MD
• Randall K. Wenokur, MD
• Michael Murray, MD

All ENT doctors in Alamo →

Other clinicians in Bass Medical Group

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

• Jamal J. Zaka, MD
• Kuang-Hwa K. Chao, MD
• Michael Hong, MD
• Matthew P. Campbell, MD
• Brian J. McGuinness, MD
• Michael A. Heisman, DPM

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