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STEPHEN P SULLIVAN MD
NPI 1891738597
Psychiatry & Neurology - Psychiatry in Tarrytown, NY

Active since June 13, 2006PECOS EnrolledAccepts Medicare Assignment
120 WHITE PLAINS RD STE 420, TARRYTOWN, NY 10591(914) 909-5838(914) 909-5840 Get Directions Write a Review

NPPES record last updated: October 31, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Stephen P Sullivan Md NPPES

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

STEPHEN P SULLIVAN MD (NPI 1891738597) is an individual psychiatry provider in Tarrytown, New York, licensed in New York (219553) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Westchester Medical Center, and maintains a secondary practice location in Valhalla.

NPPES Registry Identity

NPI1891738597
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameSTEPHEN P SULLIVANCredential: MD
Location Address120 WHITE PLAINS RD STE 420Tarrytown, NY 10591-5522
Mailing Address120 White Plains Rd Ste 420Tarrytown, NY 10591-5522 · (914) 909-5838 · Fax (914) 909-5840
Phone(914) 909-5838
Fax(914) 909-5840
Sole ProprietorNo
Medical School CMSState University Of New York Downstate Medical CenterGraduated 1997
Enumeration DateJune 13, 2006
Last NPPES UpdateOctober 31, 2025
NPPES CertifiedOctober 31, 2025
✔ NPI 1891738597 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in NY · 219553
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
120 WHITE PLAINS RD STE 420, Tarrytown, NY 10591
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Secondary Practice Location 1

Location 1100 Woods Rd.Valhalla, NY 10595 · Phone (914) 493-7124 · Fax (914) 493-1015

Other Identifiers 1

Medicaid02328843NY

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Stephen P Sullivan Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4082693064
PECOS Enrollment IDI20040714000780
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Stephen Sullivan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Westchester Psychiatric Associates, PLLC
Same address
Psychiatry
120 WHITE PLAINS RD STE 420
Tarrytown, NY 10591
  • Reassigned Medicare billing, New York enrollment
  • 3 clinicians in this Medicare group
NPI 1992004477 (914) 909-5838
Westchester Medical Center Advanced Physician Services PC
3.3 mi
Anesthesiology
100 WOODS RD, TAYLOR PAVILION - ROOM M229
Valhalla, NY 10595
  • Reassigned Medicare billing, New York enrollment
  • 1,663 clinicians in this Medicare group
NPI 1740687458 (914) 493-2844

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
612 services96 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
42 services13 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Westchester Medical Center

Acute Care Hospitals · Valhalla, NY
1/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number330234
Location100 Woods RdValhalla, NY 10595 · Westchester County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10591 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$203.53 typical visit price
range $67.40 – $203.53
Typical copayment $50.88 (range $16.85 – $50.88)
Most-billed visit code 99205
Established Patient
$83.44 typical visit price
range $21.66 – $164.45
Typical copayment $20.86 (range $5.41 – $41.11)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

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

WESTCHESTER PSYCHIATRIC ASSOCIATES, PLLC
Psychiatry & Neurology (Psychiatry)
120 WHITE PLAINS RD STE 420
TARRYTOWN, NY 10591
Westchester County (914) 909-5838

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 Stephen Sullivan's NPI number?

The NPI number for Stephen Sullivan is 1891738597. It was assigned to this individual provider in the NPPES registry on June 13, 2006.

Where is Stephen Sullivan located?

Stephen Sullivan practices at 120 White Plains Rd Ste 420, Tarrytown, NY 10591. The listed phone number is (914) 909-5838.

What is Stephen Sullivan's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Stephen Sullivan enrolled in Medicare?

Yes. Stephen Sullivan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Stephen Sullivan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Sullivan reassigns Medicare benefits to 2 organizations: Westchester Psychiatric Associates, PLLC (Tarrytown, NY) and Westchester Medical Center Advanced Physician Services PC (Valhalla, NY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Stephen Sullivan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Stephen Sullivan affiliated with any hospitals?

According to CMS data, Stephen Sullivan is affiliated with Westchester Medical Center.

When was this NPI record last updated?

The NPPES record for Stephen Sullivan was last updated on October 31, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.