Quick answers
- Does William S. Nichols accept Medicare assignment?
- Yes. Medicare's clinician data says William S. Nichols 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 William S. Nichols see?
- In 2024, CMS data shows 15 Original Medicare patients and 21 services for William S. Nichols. This counts Original Medicare only and measures volume, not quality.
- What is William S. Nichols's NPI number?
- 1326664145. 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 William S. Nichols, 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 | 15 |
|---|---|
| Services billed to Medicare | 21 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Practice locations
Addresses where William S. Nichols is enrolled with Medicare (CMS data updated October 2, 2026).
- 1390 Market St, Suite 109San Francisco, CA 94102 (415) 918‑5766
- 2671 Blanding Ave, Suite AAlameda, CA 94501 (510) 694‑4816
- 2690 5th St, Suite BAlameda, CA 94501 (510) 439‑9447
- 2920 Telegraph Ave, Suite 100Berkeley, CA 94705 (510) 686‑3621
- 411 Grand AveOakland, CA 94610 (510) 844‑4097
Group practices
Medicare enrollment lists William S. Nichols as a member of this group (CMS data updated October 2, 2026).
- Carbon Health Medical Group of California PC334 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Other clinicians in Carbon Health Medical Group of California PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1326664145 |
| 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