MELISSA DILLON HOROWITZ PSYD
NPI 1659697068
Psychologist in New York, NY

Active since April 09, 2010Opted out of Medicare · through Jul 28, 2028
150 E 58TH STREET, FIFTH FLOOR ANNEX, NEW YORK, NY 10155(212) 308-2440(212) 308-3099 Get Directions Write a Review

NPPES record last updated: January 20, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jan 20, 2026, Mar 27, 2023 (2 updates tracked since 2023).

About Melissa Dillon Horowitz Psyd NPPES

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

MELISSA DILLON HOROWITZ PSYD (NPI 1659697068) is an individual psychologist in New York, New York, licensed in New York (018527) and active in the NPI registry since April 2010. She has opted out of Medicare through July 28, 2028 and remains eligible to order and refer and is a graduate of Philadelphia College Of Osteopathic Medicine (2008).

NPPES Registry Identity

NPI1659697068
Entity TypeIndividualFemale
Primary Taxonomy103T00000X
Provider Legal NameMELISSA DILLON HOROWITZCredential: PSYD
Location Address150 E 58TH STREET, FIFTH FLOOR ANNEXNew York, NY 10155
Mailing Address150 E 58th Street, Fifth Floor AnnexNew York, NY 10155 · (212) 308-2440 · Fax (212) 308-3099
Fax(212) 308-3099
Sole ProprietorNo
Medical School CMSPhiladelphia College Of Osteopathic MedicineGraduated 2008
Enumeration DateApril 9, 2010
Last NPPES UpdateJanuary 20, 20262 updates tracked since enumeration
NPPES CertifiedJanuary 20, 2026
✔ NPI 1659697068 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyPsychologistBehavioral Health & Social Service Providers
Taxonomy Code103T00000X
License✔ Licensed in NY · 018527
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.
Also ListedPsychologist · Cognitive & BehavioralTaxonomy 103TB0200X
Also ListedPsychologist · ClinicalTaxonomy 103TC0700X · License 018527 (NY)
150 E 58TH STREET, New York, NY 10155

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

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Opted out of Medicare

Melissa Dillon Horowitz Psyd 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 July 28, 2018 through July 28, 2028.

Opt-Out Effective DateJuly 28, 2018
Opt-Out In Effect ThroughJuly 28, 2028Opt-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.

Other Providers at the Same Location NPPES

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

Student in an Organized Health Care Education/Training Program
150 E 58TH STREET, 5TH FLOOR ANNEX
NEW YORK, NY 10155

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 Melissa Horowitz's NPI number?

The NPI number for Melissa Horowitz is 1659697068. It was assigned to this individual provider in the NPPES registry on April 9, 2010.

Where is Melissa Horowitz located?

Melissa Horowitz practices at 150 E 58th Street Fifth Floor Annex, New York, NY 10155. The listed phone number is (212) 308-2440.

What is Melissa Horowitz's specialty?

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

Is Melissa Horowitz enrolled in Medicare?

No. Melissa Horowitz has opted out of Medicare through July 28, 2028. 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 Melissa Horowitz was last updated on January 20, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months 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.