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DR. RONALD D GELLIS PH.D.
NPI 1891038352
Clinical Neuropsychologist in Rancho Santa Margarita, CA

Active since April 03, 2013PECOS Enrolled
25 FLORAMAR, RANCHO SANTA MARGARITA, CA 92688(949) 533-6075 Get Directions Write a Review

NPPES record last updated: June 9, 2020. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Ronald D Gellis Ph.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. RONALD D GELLIS PH.D. (NPI 1891038352) is an individual clinical neuropsychologist in Rancho Santa Margarita, California, licensed in California (PSY9191) and active in the NPI registry since April 2013. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1891038352
Entity TypeIndividualMale
Primary Taxonomy103G00000X
Provider Legal NameDR. RONALD D GELLISCredential: PH.D.
Location Address25 FLORAMARRancho Santa Margarita, CA 92688-1308
Mailing Address25 FloramarRancho Santa Margarita, CA 92688-1308 · (949) 533-6075
Phone(949) 533-6075
Sole ProprietorYes
Enumeration DateApril 3, 2013
Last NPPES UpdateJune 9, 2020
NPPES CertifiedJune 9, 2020
✔ NPI 1891038352 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyClinical NeuropsychologistBehavioral Health & Social Service Providers
Taxonomy Code103G00000X
License✔ Licensed in CA · PSY9191
Definition
A clinical psychologist who applies principles of assessment and intervention based upon the scientific study of human behavior as it relates to normal and abnormal functioning of the central nervous system. The specialty is dedicated to enhancing the understanding of brain-behavior relationships and the application of such knowledge to human problems.
Also ListedCounselor · Addiction (Substance Use Disorder)Taxonomy 101YA0400X · License PSY9191 (CA)
Also ListedCounselor · Mental HealthTaxonomy 101YM0800X · License PSY9191 (CA)
Also ListedCounselor · ProfessionalTaxonomy 101YP2500X · License PSY9191 (CA)
25 FLORAMAR, Rancho Santa Margarita, CA 92688
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, Cigna Healthcare, UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ronald D Gellis Ph.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Ronald Gellis reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Grow Healthcare Group PC
351 mi
Mental Health
99 S ALMADEN BLVD STE 600
San Jose, CA 95113
  • Reassigned Medicare billing, California enrollment
  • 3,139 clinicians in this Medicare group
NPI 1154994846 (408) 402-4385
Grow Healthcare Group PA
2,299 mi
Mental Health
66 W FLAGLER ST STE 900
Miami, FL 33130
  • Reassigned Medicare billing, Texas enrollment
  • 1,573 clinicians in this Medicare group
NPI 1245845932 (786) 244-7711

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Ronald Gellis's NPI number?

The NPI number for Ronald Gellis is 1891038352. It was assigned to this individual provider in the NPPES registry on April 3, 2013.

Where is Ronald Gellis located?

Ronald Gellis practices at 25 Floramar, Rancho Santa Margarita, CA 92688. The listed phone number is (949) 533-6075.

What is Ronald Gellis's specialty?

The primary specialty registered for this NPI is Clinical Neuropsychologist with taxonomy code 103G00000X.

Is Ronald Gellis enrolled in Medicare?

Yes. Ronald Gellis is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ronald Gellis's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ronald Gellis reassigns Medicare benefits to 2 organizations: Grow Healthcare Group PC (San Jose, CA) and Grow Healthcare Group PA (Miami, FL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ronald Gellis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ronald Gellis accept?

Health plans from Blue Cross and Blue Shield of Texas, Cigna Healthcare and UnitedHealthcare list Ronald Gellis as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Ronald Gellis was last updated on June 9, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.