J. Preston Harley, PHD
NPI 1578598462 · Clinical Neuropsychologist · Naperville, IL
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
J. Preston Harley, PHD is a Clinical Neuropsychologist provider in Naperville, IL (NPI 1578598462).
Provider details
- NPI number
- 1578598462
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 071-004240 (IL)
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
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
- 2006-07-11
- Last updated
- 2025-09-11
Frequently asked questions
- What is J. Preston Harley's NPI number?
- J. Preston Harley's National Provider Identifier (NPI) is 1578598462, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is J. Preston Harley's specialty?
- J. Preston Harley is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
- Where is J. Preston Harley located?
- J. Preston Harley's practice location on file with NPPES is 3155 Book Rd, Naperville, IL 60564-9545.
- What is J. Preston Harley's phone number?
- The practice phone number listed in the NPPES registry for J. Preston Harley is (630) 293-4321.
- Does J. Preston Harley accept Medicare?
- J. Preston Harley is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is J. Preston Harley's NPI active?
- Yes — J. Preston Harley's NPI (1578598462) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.