William Wood, M.D., M.S.
NPI 1821309022 · Surgery Physician · Castro Valley, CA
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Wood, M.D., M.S. is a Surgery Physician provider in Castro Valley, CA (NPI 1821309022).
Provider details
- NPI number
- 1821309022
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.S.
- Sex
- Male
- Sole proprietor
- No
- License
- A119594 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
16 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
332 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 119 | $88 |
| Critical Care, First 30-74 Minutes99291 | 68 | $232 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 57 | $132 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 52 | $193 |
| Critical Care, Each Additional 30 Minutes99292 | 36 | $117 |
Typical Medicare-allowed amounts for these services range $88–$232 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$315 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-06-23
- Last updated
- 2026-02-12
- Certified
- 2026-02-12
Frequently asked questions
- What is William Wood's NPI number?
- William Wood's National Provider Identifier (NPI) is 1821309022, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Wood's specialty?
- William Wood is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is William Wood located?
- William Wood's practice location on file with NPPES is 19845 Lake Chabot Rd Ste 200, Castro Valley, CA 94546-4055.
- What is William Wood's phone number?
- The practice phone number listed in the NPPES registry for William Wood is (510) 538-5500.
- Does William Wood accept Medicare?
- William Wood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Wood's NPI active?
- Yes — William Wood's NPI (1821309022) is active in the NPPES registry as of the last update on 2026-02-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.