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

ASHLYN OLSON-CASTRO MS, LLP
NPI 1154174928
Psychologist in Fenton, MI

Active since April 10, 2024
127 N RIVER ST, FENTON, MI 48430(810) 309-9355(810) 750-1152 Get Directions Write a Review

NPPES record last updated: September 29, 2026. Verified against the NPPES registry weekly; last sync: October 11, 2026.

Record update history: Sep 29, 2026, Apr 10, 2024 (2 updates tracked since 2024).

About Ashlyn Olson-castro Ms, Llp NPPES

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

ASHLYN OLSON-CASTRO MS, LLP (NPI 1154174928) is an individual psychologist in Fenton, Michigan, licensed in Michigan (6362009919) and active in the NPI registry since April 2024.

NPPES Registry Identity

NPI1154174928
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameASHLYN OLSON-CASTROCredential: MS, LLP
Location Address127 N RIVER STFenton, MI 48430-3800
Mailing Address127 N River StFenton, MI 48430-3800 · (810) 309-9355 · Fax (810) 750-1152
Fax(810) 750-1152
Sole ProprietorNo
Enumeration DateApril 10, 2024
Last NPPES UpdateSeptember 29, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 29, 2026
✔ NPI 1154174928 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 MI · 6362009919
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.
127 N RIVER ST, Fenton, MI 48430

Other Providers at the Same Location NPPES 15

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

Counselor
127 N RIVER ST
FENTON, MI 48430
Psychologist
127 N RIVER ST
FENTON, MI 48430
Social Worker (Clinical)
127 N RIVER ST
FENTON, MI 48430
Counselor
127 N RIVER ST
FENTON, MI 48430
Counselor (Professional)
127 N RIVER ST
FENTON, MI 48430
Counselor
127 N RIVER ST
FENTON, MI 48430
Counselor (Professional)
127 N RIVER ST
FENTON, MI 48430
Psychologist
127 N RIVER ST
FENTON, MI 48430

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 Ashlyn Olson-castro's NPI number?

The NPI number for Ashlyn Olson-castro is 1154174928. It was assigned to this individual provider in the NPPES registry on April 10, 2024.

Where is Ashlyn Olson-castro located?

Ashlyn Olson-castro practices at 127 N River St, Fenton, MI 48430. The listed phone number is (810) 309-9355.

What is Ashlyn Olson-castro's specialty?

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

When was this NPI record last updated?

The NPPES record for Ashlyn Olson-castro was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.