Douglas B. Demerchant Psy.d., LLC
NPI 1548380405 · Clinical Psychologist · Wheaton, IL
Douglas B. Demerchant Psy.d., LLC is a Clinical Psychologist organization in Wheaton, IL (NPI 1548380405).
Provider details
- NPI number
- 1548380405
- Entity type
- Organization
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Organization subpart
- No
- Authorized official
- Douglas Demerchant, Owner(630) 462-1999
- License
- 071003669 (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
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
- 2007-04-01
- Last updated
- 2011-01-29
Frequently asked questions
- What is Douglas B. Demerchant Psy.d., LLC's NPI number?
- Douglas B. Demerchant Psy.d., LLC's National Provider Identifier (NPI) is 1548380405, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Douglas B. Demerchant Psy.d., LLC?
- Douglas B. Demerchant Psy.d., LLC is classified in the NPPES registry as Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Douglas B. Demerchant Psy.d., LLC located?
- Douglas B. Demerchant Psy.d., LLC's practice location on file with NPPES is 620 W Roosevelt Rd, Wheaton, IL 60187-5086.
- What is Douglas B. Demerchant Psy.d., LLC's phone number?
- The practice phone number listed in the NPPES registry for Douglas B. Demerchant Psy.d., LLC is (630) 462-1999.
- Who is the authorized official for Douglas B. Demerchant Psy.d., LLC?
- The authorized official listed on Douglas B. Demerchant Psy.d., LLC's NPPES record is Douglas Demerchant, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Douglas B. Demerchant Psy.d., LLC's NPI active?
- Yes — Douglas B. Demerchant Psy.d., LLC's NPI (1548380405) is active in the NPPES registry as of the last update on 2011-01-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.