Quick answers
- Does Seymour M. Weaver Iii accept Medicare assignment?
- Yes. Medicare's clinician data says Seymour M. Weaver 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 Seymour M. Weaver Iii see?
- In 2024, CMS data shows 268 Original Medicare patients and 1,006 services for Seymour M. Weaver Iii. This counts Original Medicare only and measures volume, not quality.
- What is Seymour M. Weaver Iii's NPI number?
- 1225126956. 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 Seymour M. Weaver 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 | 268 |
|---|---|
| Services billed to Medicare | 1,006 |
| Different services or procedures | 29 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)359 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)116 services
- Biopsy of related skin growth, first growth (11102)110 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)100 services
- Destruction of precancer skin growth, 1 growth (17000)91 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 pressure64%
- High cholesterol63%
- Arthritis38%
- Chronic kidney disease26%
- Diabetes21%
- Depression20%
Practice locations
Addresses where Seymour M. Weaver Iii is enrolled with Medicare (CMS data updated October 2, 2026).
- 20400 Lake Chabot Rd, Suite 202Castro Valley, CA 94546 (510) 881‑7822
Group practices
Medicare enrollment lists Seymour M. Weaver Iii as a member of this group (CMS data updated October 2, 2026).
- Csi Medical Group111 clinicians in the group
Specialties
- Dermatologyprimary
Other dermatologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Csi Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 1977 (49 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225126956 |
| 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
- 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