Grant G. Seiden, MD

Medicare activity in 2024

Official CMS public-use data for Grant G. Seiden, 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)534 services
2. Injection, betamethasone acetate 3 mg and betamethasone sodium phosphate 3 mg (J0702)402 services
3. X-ray of hand, minimum of 3 views (73130)215 services
4. X-ray of wrist, minimum of 3 views (73110)170 services
5. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)141 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%
• Arthritis65%
• High blood pressure64%
• Diabetes24%
• Depression21%
• Anxiety21%

Hospitals where Grant G. Seiden works

Medicare's Facility Affiliation Data lists Grant G. Seiden 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.

• Tri-City Medical CenterOceanside, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050128

Practice locations

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

• 3905 Waring RdOceanside, CA 92056 (760) 724‑9000
• 6121 Paseo Del Norte, Suite 200Carlsbad, CA 92011 (760) 724‑9000

Group practices

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

• Tri-City Orthopaedic Surgery Medical Group Inc.25 clinicians in the group

Specialties

• Hand Surgeryprimary

Find other Hand Surgery doctors in California →

Other hand surgeons in California

Clinicians with the same Medicare primary specialty in California — not a recommendation.

• Andrew P. Hartman, MD
• Justin H. Chan, MD
• Roberto Diaz, MD
• John D. King, MD
• Kodi K. Azari, MD
• George W. Balfour, MD
• Jun Y. Matsui, MD
• Stephanie M. Gancarczyk, MD

All hand surgeons in California →

Other clinicians in Tri-City Orthopaedic Surgery Medical Group Inc.

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

• Jennifer A. Pennington, PT
• Ryan T. Johnson, PA
• Tivi M. Mauro, PA
• Andrew M. Cooperman, MD
• Reid E. Bouchard, PT
• Norman Kane, 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