Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. GREGORY ALAN NELSON PHD
NPI 1497757538
Psychologist in Redondo Beach, CA

Active since August 10, 2005Opted out of Medicare · through Oct 1, 2027
1617 S PCH HWY, SUITE F, REDONDO BEACH, CA 90277(310) 540-2061(310) 540-8550 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Gregory Alan Nelson Phd NPPES

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

DR. GREGORY ALAN NELSON PHD (NPI 1497757538) is an individual psychologist in Redondo Beach, California, licensed in California (PSY 12389) and active in the NPI registry since August 2005. He has opted out of Medicare through October 1, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1497757538
Entity TypeIndividualMale
Primary Taxonomy103T00000X
Provider Legal NameDR. GREGORY ALAN NELSONCredential: PHD
Location Address1617 S PCH HWY, SUITE FRedondo Beach, CA 90277-5612
Mailing Address1617 S Pch Hwy, Suite FRedondo Beach, CA 90277-5612 · (310) 540-2061 · Fax (310) 540-8550
Fax(310) 540-8550
Sole ProprietorNo
Enumeration DateAugust 10, 2005
Last NPPES UpdateJuly 13, 2026
NPI 1497757538 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License Licensed in CA · PSY 12389
Definition
A psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.
1617 S PCH HWY, Redondo Beach, CA 90277

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

Opted out of Medicare

Dr. Gregory Alan Nelson Phd has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from October 1, 2013 through October 1, 2027.

Opt-Out Effective DateOctober 1, 2013
Opt-Out In Effect ThroughOctober 1, 2027Opt-out affidavits renew automatically every two years unless cancelled
Eligible to Order & Refer Part B Labs & Imaging Durable Medical Equipment Home Health Agency Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

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 Gregory Nelson's NPI number?

The NPI number for Gregory Nelson is 1497757538. It was assigned to this individual provider in the NPPES registry on August 10, 2005.

Where is Gregory Nelson located?

Gregory Nelson practices at 1617 S Pch Hwy Suite F, Redondo Beach, CA 90277. The listed phone number is (310) 540-2061.

What is Gregory Nelson's specialty?

The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.

Is Gregory Nelson enrolled in Medicare?

No. Gregory Nelson has opted out of Medicare through October 1, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Gregory Nelson was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 30 days 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.