Karl A. Peterson, MD

Medicare activity in 2024

Official CMS public-use data for Karl A. Peterson, 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)79 services
2. Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)46 services
3. Annual depression screening, 5 to 15 minutes (G0444)46 services
4. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)45 services
5. Telephone medical discussion with physician, 5-10 minutes (99441)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 cholesterol73%
• High blood pressure57%
• Arthritis35%
• Ischemic heart disease22%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)19%
• Diabetes16%

Hospitals where Karl A. Peterson works

Medicare's Facility Affiliation Data lists Karl A. Peterson 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.

• Glendale Adventist Medical CenterGlendale, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050239
• USC Verdugo Hills HospitalGlendale, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050124

Practice locations

Addresses where Karl A. Peterson is enrolled with Medicare (CMS data updated October 2, 2026).

• 2200 Foothill BlvdLa Canada Flintridge, CA 91011 (818) 790‑1103

Group practices

Medicare enrollment lists Karl A. Peterson as a member of this group (CMS data updated October 2, 2026).

• Healthcare Partners Affiliates Medical Group754 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in California →

Other family doctors in La Canada Flintridge

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

• Leland E. Watkins, MD
• Celedonia X. Yue, MD
• Nasreen Sabir, MD

All family doctors in La Canada Flintridge →

Other clinicians in Healthcare Partners Affiliates Medical Group

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

• Margret Joy G. Garcia, MD
• Pedram Shirzad, DO
• Riley Newcomb, PA
• Vadim V. Fanous, MD
• Leela Mazarei, PA
• Sandy Blanco Hernandez, NP

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