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Gregory Tierney, PHD
NPI 1609949809 · Clinical Psychologist · Sycamore, IL
Gregory Tierney, PHD is a Clinical Psychologist provider in Sycamore, IL (NPI 1609949809).
Provider details
- NPI number
- 1609949809
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- Sole proprietor
- No
- License
- 071.006674 (IL)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
Detailed profile(90/100 index)
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
920 S Prairie Dr
Suite F
Sycamore, IL 60178
Phone: (815) 899-0339
Fax: (815) 899-2098
Street-level locationGet directions
Mailing address
3498 Sanborn Ln
Dekalb, IL 60115-8304
Registry dates
- Enumerated
- 2006-11-16
- Last updated
- 2018-05-23
Frequently asked questions
- What is Gregory Tierney's NPI number?
- Gregory Tierney's National Provider Identifier (NPI) is 1609949809, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Tierney's specialty?
- Gregory Tierney is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Gregory Tierney located?
- Gregory Tierney's practice location on file with NPPES is 920 S Prairie Dr, Sycamore, IL 60178.
- What is Gregory Tierney's phone number?
- The practice phone number listed in the NPPES registry for Gregory Tierney is (815) 899-0339.
- Is Gregory Tierney's NPI active?
- Yes — Gregory Tierney's NPI (1609949809) is active in the NPPES registry as of the last update on 2018-05-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.