William O'Bryant, M.D.
NPI 1013041003 · Internal Medicine Physician · Cypress, CA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William O'Bryant, M.D. is a Internal Medicine Physician provider in Cypress, CA (NPI 1013041003).
Provider details
- NPI number
- 1013041003
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G42434 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
- 2007-03-14
- Last updated
- 2016-03-24
Frequently asked questions
- What is William O'Bryant's NPI number?
- William O'Bryant's National Provider Identifier (NPI) is 1013041003, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William O'Bryant's specialty?
- William O'Bryant is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William O'Bryant located?
- William O'Bryant's practice location on file with NPPES is 5757 Plaza Dr, Cypress, CA 90630-5000.
- What is William O'Bryant's phone number?
- The practice phone number listed in the NPPES registry for William O'Bryant is (714) 226-6884.
- Does William O'Bryant accept Medicare?
- William O'Bryant is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William O'Bryant's NPI active?
- Yes — William O'Bryant's NPI (1013041003) is active in the NPPES registry as of the last update on 2016-03-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.