Ronald Gellis, PH.D.
NPI 1891038352 · Clinical Neuropsychologist · Rancho Santa Margarita, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ronald Gellis, PH.D. is a Clinical Neuropsychologist provider in Rancho Santa Margarita, CA (NPI 1891038352).
Provider details
- NPI number
- 1891038352
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY9191 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
13 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
- 2013-04-03
- Last updated
- 2020-06-09
- Certified
- 2020-06-09
Frequently asked questions
- What is Ronald Gellis's NPI number?
- Ronald Gellis's National Provider Identifier (NPI) is 1891038352, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ronald Gellis's specialty?
- Ronald Gellis is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
- Where is Ronald Gellis located?
- Ronald Gellis's practice location on file with NPPES is 25 Floramar, Rancho Santa Margarita, CA 92688-1308.
- What is Ronald Gellis's phone number?
- The practice phone number listed in the NPPES registry for Ronald Gellis is (949) 533-6075.
- Does Ronald Gellis accept Medicare?
- Ronald Gellis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ronald Gellis's NPI active?
- Yes — Ronald Gellis's NPI (1891038352) is active in the NPPES registry as of the last update on 2020-06-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.