IndividualActive
William Nation, M.D.
NPI 1558438622 · Family Medicine Physician · Atwater, CA
William Nation, M.D. is a Family Medicine Physician provider in Atwater, CA (NPI 1558438622).
Provider details
- NPI number
- 1558438622
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G39686 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
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
1775 3rd St
Atwater, CA 95301-3608
Phone: (209) 358-5611
Fax: (209) 358-0219
Street-level locationGet directions
Mailing address
1775 3rd St
Atwater, CA 95301-3608
Registry dates
- Enumerated
- 2006-11-30
- Last updated
- 2012-11-09
Frequently asked questions
- What is William Nation's NPI number?
- William Nation's National Provider Identifier (NPI) is 1558438622, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Nation's specialty?
- William Nation is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Nation located?
- William Nation's practice location on file with NPPES is 1775 3rd St, Atwater, CA 95301-3608.
- What is William Nation's phone number?
- The practice phone number listed in the NPPES registry for William Nation is (209) 358-5611.
- Is William Nation's NPI active?
- Yes — William Nation's NPI (1558438622) is active in the NPPES registry as of the last update on 2012-11-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.