William Ruiz, MD
NPI 1811912504 · Family Medicine Physician · Hawthorne, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Ruiz, MD is a Family Medicine Physician provider in Hawthorne, CA (NPI 1811912504).
Provider details
- NPI number
- 1811912504
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G47785 (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
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
- 2006-07-13
- Last updated
- 2012-11-05
Frequently asked questions
- What is William Ruiz's NPI number?
- William Ruiz's National Provider Identifier (NPI) is 1811912504, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ruiz's specialty?
- William Ruiz is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Ruiz located?
- William Ruiz's practice location on file with NPPES is 5400 W Rosecrans Ave, Hawthorne, CA 90250-6609.
- What is William Ruiz's phone number?
- The practice phone number listed in the NPPES registry for William Ruiz is (310) 727-1722.
- Does William Ruiz accept Medicare?
- William Ruiz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Ruiz's NPI active?
- Yes — William Ruiz's NPI (1811912504) is active in the NPPES registry as of the last update on 2012-11-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.