William Rook, M.A., LCPC
NPI 1194736397 · Mental Health Counselor · O Fallon, IL
William Rook, M.A., LCPC is a Mental Health Counselor provider in O Fallon, IL (NPI 1194736397).
Provider details
- NPI number
- 1194736397
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Credential
- M.A., LCPC
- Sex
- Male
- Sole proprietor
- Yes
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
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
Mailing address
Registry dates
- Enumerated
- 2006-08-11
- Last updated
- 2007-07-09
Frequently asked questions
- What is William Rook's NPI number?
- William Rook's National Provider Identifier (NPI) is 1194736397, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Rook's specialty?
- William Rook is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is William Rook located?
- William Rook's practice location on file with NPPES is 732 Sussex Way, O Fallon, IL 62269-3074.
- What is William Rook's phone number?
- The practice phone number listed in the NPPES registry for William Rook is (618) 531-8501.
- Is William Rook's NPI active?
- Yes — William Rook's NPI (1194736397) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.