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

THEODORE ALAN SINNAEVE LLP
NPI 1003867680
Psychologist in Lansing, MI

Active since May 16, 2006
5303 S CEDAR ST, STE 219, LANSING, MI 48911(517) 346-8248(517) 346-8291 Get Directions Write a Review

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

About Theodore Alan Sinnaeve Llp NPPES

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

THEODORE ALAN SINNAEVE LLP (NPI 1003867680) is an individual psychologist in Lansing, Michigan, licensed in Michigan (6301012911) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1003867680
Entity TypeIndividualMale
Primary Taxonomy103T00000X
Provider Legal NameTHEODORE ALAN SINNAEVECredential: LLP
Location Address5303 S CEDAR ST, STE 219Lansing, MI 48911-3800
Mailing Address812 E Jolly Rd, Ste 210Lansing, MI 48910-6818 · (517) 346-8410 · Fax (517) 346-8291
Fax(517) 346-8291
Sole ProprietorNo
Enumeration DateMay 16, 2006
Last NPPES UpdateJuly 13, 2026
NPI 1003867680 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 · 6301012911
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.
5303 S CEDAR ST, Lansing, MI 48911

Other Providers at the Same Location NPPES 20

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

Social Worker
5303 S CEDAR ST
LANSING, MI 48911
Community Health Worker
5303 S CEDAR ST
LANSING, MI 48911
Nurse Practitioner (Family)
5303 S CEDAR ST
LANSING, MI 48911
Nurse Practitioner
5303 S CEDAR ST
LANSING, MI 48911
Social Worker
5303 S CEDAR ST
LANSING, MI 48911
Nurse Practitioner (Family)
5303 S CEDAR ST
LANSING, MI 48911
Dental Hygienist
5303 S CEDAR ST
LANSING, MI 48911
Social Worker
5303 S CEDAR ST
LANSING, MI 48911

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 Theodore Sinnaeve's NPI number?

The NPI number for Theodore Sinnaeve is 1003867680. It was assigned to this individual provider in the NPPES registry on May 16, 2006.

Where is Theodore Sinnaeve located?

Theodore Sinnaeve practices at 5303 S Cedar St Ste 219, Lansing, MI 48911. The listed phone number is (517) 346-8248.

What is Theodore Sinnaeve'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 Theodore Sinnaeve 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 32 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.