William Mcnaught, MD
NPI 1871892216 · Critical Care Medicine (Internal Medicine) Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Critical Care (intensivists) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mcnaught, MD is a Critical Care Medicine (Internal Medicine) Physician provider in Stanford, CA (NPI 1871892216).
Provider details
- NPI number
- 1871892216
- Entity type
- Individual
- Primary specialty
- Critical Care Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A131199 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
85 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Critical Care, First 30-74 Minutes99291 | 55 | $231 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 30 | $131 |
Typical Medicare-allowed amounts for these services range $131–$231 (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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-03-24
- Last updated
- 2016-08-18
Frequently asked questions
- What is William Mcnaught's NPI number?
- William Mcnaught's National Provider Identifier (NPI) is 1871892216, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mcnaught's specialty?
- William Mcnaught is listed in the NPPES registry with a primary specialty of Critical Care Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is William Mcnaught located?
- William Mcnaught's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is William Mcnaught's phone number?
- The practice phone number listed in the NPPES registry for William Mcnaught is (650) 723-4000.
- Does William Mcnaught accept Medicare?
- William Mcnaught is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mcnaught's NPI active?
- Yes — William Mcnaught's NPI (1871892216) is active in the NPPES registry as of the last update on 2016-08-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.