DR. RONALD D GELLIS PH.D. NPI 1891038352

NPI Information

NPI: 1891038352
Provider Name: DR. RONALD D GELLIS, PH.D.
Classification: Clinical Neuropsychologist - 103G00000X
Entity Type: Individual
PECOS Registration: Yes
Address: 25 FLORAMAR
RANCHO SANTA MARGARITA, CA
ZIP 92688
Phone: (949) 533-6075

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NPI Details

DR. Ronald D Gellis, PH.D. is a clinical neuropsychologist in Rancho Santa Margarita, CA. The provider is 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. DR. Ronald D Gellis, PH.D. NPI is 1891038352. The provider is registered as an individual entity type.

The NPPES NPI record indicates the provider is a male.

The provider's business location address is:

25 FLORAMAR
RANCHO SANTA MARGARITA, CA
ZIP 92688-308
Phone: (949) 533-6075

The NPI 1891038352 is registered in the Medicare Provider, Enrollment, Chain and Ownership System (PECOS). The provider is legally eligible to order and refer Part B (Clinical Laboratory and Imaging), Durable Medical Equipment.

The enumeration date for this NPI number is 4/3/2013 and was last updated on 6/9/2020.

Taxonomy Codes

The NPI record includes the healthcare provider taxonomy classification, state license number and state of licensure. The following information regarding the scope of practice of this provider is available:

No.	Taxonomy Code	Taxonomy Clasification	Taxonomy Specialization	License Number	License State	Primary
1	101YA0400X	Counselor	Addiction (Substance Use Disorder)	PSY9191	CALIFORNIA	No
2	101YM0800X	Counselor	Mental Health	PSY9191	CALIFORNIA	No
3	101YP2500X	Counselor	Professional	PSY9191	CALIFORNIA	No
4	103G00000X	Clinical Neuropsychologist		PSY9191	CALIFORNIA	Yes

What is NPI?

NPI stands for National Provider Identifier. The NPI is a 10-digit identification number that is completely unique. The NPI number by itself does not contain any identifiable information such as a provider’s speciality or location. The NPI is assigned to individuals or organizacions for their lifespan and it is independent of key provider information type updates like a change of practices, location or speciality.

This page was last updated on: 11/21/2025

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