Quick answers
- Does Alden J. McDonald Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Alden J. McDonald Iii accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Alden J. McDonald Iii see?
- In 2024, CMS data shows 1,146 Original Medicare patients and 3,058 services for Alden J. McDonald Iii. This counts Original Medicare only and measures volume, not quality.
- What is Alden J. McDonald Iii's NPI number?
- 1083629786. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Alden J. McDonald Iii, 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.
| Original Medicare patients | 1,146 |
|---|---|
| Services billed to Medicare | 3,058 |
| Different services or procedures | 43 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)669 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)475 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)453 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)403 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)201 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 pressure75%
- High cholesterol75%
- Arthritis44%
- Ischemic heart disease43%
- Chronic kidney disease41%
- Atrial fibrillation39%
Hospitals where Alden J. McDonald Iii works
Medicare's Facility Affiliation Data lists Alden J. McDonald Iii 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.
- Alta Bates Summit Medical CenterOakland, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050043
- Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050305
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050047
- Eden Medical CenterCastro Valley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050488
- Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441
Practice locations
Addresses where Alden J. McDonald Iii is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 15; the Medicare profile lists all.
- 12 Camino EncinasOrinda, CA 94563 (510) 204‑8180
- 20101 Lake Chabot RdCastro Valley, CA 94546 (510) 886‑3400
- 20103 Lake Chabot RdCastro Valley, CA 94546 (510) 727‑3256
- 20130 Lake Chabot RdCastro Valley, CA 94546
- 2450 Ashby AveBerkeley, CA 94705
Group practices
Medicare enrollment lists Alden J. McDonald Iii as a member of this group (CMS data updated October 2, 2026).
- Sutter Bay Medical Foundation3,829 clinicians in the group
Specialties
- Interventional Cardiologyprimary
Find other Interventional Cardiology doctors in California →
Other interventional cardiologists in Orinda
Clinicians with the same Medicare primary specialty in Orinda, CA — not a recommendation.
Other clinicians in Sutter Bay Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvey Medical College |
| Graduation year | 2004 (22 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1083629786 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians