William Mathis, LCSW, CADC
NPI 1639408990 · Clinical Social Worker · Clarksville, IN
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mathis, LCSW, CADC is a Clinical Social Worker provider in Clarksville, IN (NPI 1639408990).
Provider details
- NPI number
- 1639408990
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW, CADC
- Sex
- Male
- Sole proprietor
- Yes
- License
- 1048 (KY)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
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
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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
Additional practice locations (1)
- 3907 Elgin WayLouisville, KY 40216-4908Phone: (502) 778-2006
Registry dates
- Enumerated
- 2009-12-16
- Last updated
- 2018-10-29
Frequently asked questions
- What is William Mathis's NPI number?
- William Mathis's National Provider Identifier (NPI) is 1639408990, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mathis's specialty?
- William Mathis is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is William Mathis located?
- William Mathis's practice location on file with NPPES is 517 Little League Blvd, Clarksville, IN 47129-6629.
- What is William Mathis's phone number?
- The practice phone number listed in the NPPES registry for William Mathis is (888) 948-6789.
- Does William Mathis accept Medicare?
- William Mathis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mathis's NPI active?
- Yes — William Mathis's NPI (1639408990) is active in the NPPES registry as of the last update on 2018-10-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.