William Billows, PHD HSPP
NPI 1619969854 · Clinical Psychologist · Mount Prospect, IL
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Billows, PHD HSPP is a Clinical Psychologist provider in Mount Prospect, IL (NPI 1619969854).
Provider details
- NPI number
- 1619969854
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD HSPP
- Sex
- Male
- Sole proprietor
- Yes
- License
- 071.006777 (IL)
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
21 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
- 2005-08-15
- Last updated
- 2022-07-21
Frequently asked questions
- What is William Billows's NPI number?
- William Billows's National Provider Identifier (NPI) is 1619969854, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Billows's specialty?
- William Billows is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is William Billows located?
- William Billows's practice location on file with NPPES is 800 E Northwest Hwy Ste 106, Mount Prospect, IL 60056-3457.
- What is William Billows's phone number?
- The practice phone number listed in the NPPES registry for William Billows is (847) 909-9858.
- Does William Billows accept Medicare?
- William Billows is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Billows's NPI active?
- Yes — William Billows's NPI (1619969854) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.