William Mathias, LCSW
NPI 1912071101 · Clinical Social Worker · Green Bay, WI
William Mathias, LCSW is a Clinical Social Worker provider in Green Bay, WI (NPI 1912071101).
Provider details
- NPI number
- 1912071101
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- No
- License
- 2091-123 (WI)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
- 2006-11-20
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Mathias's NPI number?
- William Mathias's National Provider Identifier (NPI) is 1912071101, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mathias's specialty?
- William Mathias is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is William Mathias located?
- William Mathias's practice location on file with NPPES is 130 E Walnut St, Green Bay, WI 54301-4239.
- What is William Mathias's phone number?
- The practice phone number listed in the NPPES registry for William Mathias is (920) 437-8256.
- Is William Mathias's NPI active?
- Yes — William Mathias's NPI (1912071101) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.