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William Cornwell
NPI 1164730842 · Mental Health Counselor · Seattle, WA
William Cornwell is a Mental Health Counselor provider in Seattle, WA (NPI 1164730842).
Provider details
- NPI number
- 1164730842
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(76/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
83% 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
1812 E Madison St
Seattle, WA 98122-2843
Phone: (425) 610-9403
Street-level locationGet directions
Mailing address
433 31st Ave E
Seattle, WA 98112-4826
Registry dates
- Enumerated
- 2010-09-16
- Last updated
- 2010-09-16
Frequently asked questions
- What is William Cornwell's NPI number?
- William Cornwell's National Provider Identifier (NPI) is 1164730842, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Cornwell's specialty?
- William Cornwell is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is William Cornwell located?
- William Cornwell's practice location on file with NPPES is 1812 E Madison St, Seattle, WA 98122-2843.
- What is William Cornwell's phone number?
- The practice phone number listed in the NPPES registry for William Cornwell is (425) 610-9403.
- Is William Cornwell's NPI active?
- Yes — William Cornwell's NPI (1164730842) is active in the NPPES registry as of the last update on 2010-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.