Patrick Halliday, MD
NPI 1659908242 · Anesthesiology Physician · Santa Clara, CA
Enrolled with Medicare as Practitioner - Anesthesiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Patrick Halliday, MD is a Anesthesiology Physician provider in Santa Clara, CA (NPI 1659908242).
Provider details
- NPI number
- 1659908242
- Entity type
- Individual
- Primary specialty
- Anesthesiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A197179 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2020-03-24
- Last updated
- 2025-10-12
- Certified
- 2025-10-12
Frequently asked questions
- What is Patrick Halliday's NPI number?
- Patrick Halliday's National Provider Identifier (NPI) is 1659908242, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Patrick Halliday's specialty?
- Patrick Halliday is listed in the NPPES registry with a primary specialty of Anesthesiology Physician (Allopathic & Osteopathic Physicians).
- Where is Patrick Halliday located?
- Patrick Halliday's practice location on file with NPPES is 700 Lawrence Expy, Santa Clara, CA 95051-5173.
- What is Patrick Halliday's phone number?
- The practice phone number listed in the NPPES registry for Patrick Halliday is (408) 851-1000.
- Does Patrick Halliday accept Medicare?
- Patrick Halliday is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Patrick Halliday's NPI active?
- Yes — Patrick Halliday's NPI (1659908242) is active in the NPPES registry as of the last update on 2025-10-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.