William Steffan, MD
NPI 1790758431 · Family Medicine Physician · Laguna Niguel, CA
William Steffan, MD is a Family Medicine Physician provider in Laguna Niguel, CA (NPI 1790758431).
Provider details
- NPI number
- 1790758431
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G42830 (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
20 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
- 2006-02-13
- Last updated
- 2018-06-25
Frequently asked questions
- What is William Steffan's NPI number?
- William Steffan's National Provider Identifier (NPI) is 1790758431, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Steffan's specialty?
- William Steffan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Steffan located?
- William Steffan's practice location on file with NPPES is 27231 La Paz Rd, Laguna Niguel, CA 92677.
- What is William Steffan's phone number?
- The practice phone number listed in the NPPES registry for William Steffan is (949) 643-9111.
- Is William Steffan's NPI active?
- Yes — William Steffan's NPI (1790758431) is active in the NPPES registry as of the last update on 2018-06-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.