Catherine G. Dieffenbach, MD

Medicare activity in 2024

Official CMS public-use data for Catherine G. Dieffenbach, 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. Cervical or vaginal cancer screening; pelvic and clinical breast examination (G0101)17 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)15 services
4. Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina (76830)14 services
5. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)12 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 cholesterol65%
• Arthritis44%
• High blood pressure42%
• Osteoporosis26%
• Anxiety21%
• Ischemic heart disease19%

Hospitals where Catherine G. Dieffenbach works

Medicare's Facility Affiliation Data lists Catherine G. Dieffenbach 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.

• Scripps Memorial Hospital La JollaLa Jolla, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050324

Practice locations

Addresses where Catherine G. Dieffenbach is enrolled with Medicare (CMS data updated October 2, 2026).

• 9339 Genesee Ave, Suite 220San Diego, CA 92121

Group practices

Medicare enrollment lists Catherine G. Dieffenbach as a member of this group (CMS data updated October 2, 2026).

• Igo Medical Group Amc11 clinicians in the group

Specialties

• Obstetrics/Gynecologyprimary

Find other Obstetrics/Gynecology doctors in California →

Other OB-GYNs in San Diego

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

• Parker Murray, DO
• Ghanshyam S. Yadav, MD
• Leah M. Lamale Smith, MD
• Kim M. Goodwin, MD
• Gillian Mackay, MD
• Mariann Alperin, MD
• Melissa A. Douglass, MD
• Jack Hsiao, MD

All OB-GYNs in San Diego →

Other clinicians in Igo Medical Group Amc

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

• Wendy M. Buchi, MD
• Dana M. Teller, MD
• Anne M. Lyon, MD
• Heather E. Gunnarson, MD
• Keerti Gurushanthaiah, MD
• Valerie V. Gafori, 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