Keith R. Fischer, MD

Medicare activity in 2024

Official CMS public-use data for Keith R. Fischer, 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. Administration of influenza virus vaccine (G0008)366 services
2. Influenza vaccine, inactivated (90653)257 services
3. Admn sarscov2 vacc 1 dose (90480)252 services
4. Sarscov2 vac 50 mcg/0.5ml im (91322)252 services
5. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)122 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 pressure62%
• High cholesterol60%
• Arthritis35%
• Diabetes27%
• Ischemic heart disease16%
• Depression16%

Hospitals where Keith R. Fischer works

Medicare's Facility Affiliation Data lists Keith R. Fischer 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.

• Grossmont HospitalLa Mesa, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050026

Practice locations

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

• 8881 Fletcher Pkwy, Suite 105La Mesa, CA 91942 (858) 499‑2600

Group practices

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

• Sharp Rees-Stealy Medical Group Inc884 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in California →

Other family doctors in La Mesa

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

• Susette Var
• Anna Hackenberg
• Robert B. Lajvardi, MD
• Vikash Pernenkil, MD
• Rebecca R. Smith, MD
• Alex P. Johnson, DO
• James Y. Youn, MD
• Kenneth A. Altschuler, MD

All family doctors in La Mesa →

Other clinicians in Sharp Rees-Stealy Medical Group Inc

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

• Erik A. Poast, PA
• Alison Newton, PA
• Ariella Goldblatt, MD
• Marin Dimmette-Schweigert, AU
• Shankar Sundaram
• Mihaela I. Pop, 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