MR. MARK WILLIAM HENNESSEY LCSW-R
NPI 1427366772
Social Worker - Clinical in Brewster, NY

Q: What is Mark Hennessey's NPI number?

The NPI number for Mark Hennessey is 1427366772. It was assigned to this individual provider in the NPPES registry on September 21, 2010.

Q: What is Mark Hennessey's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

Q: Is Mark Hennessey enrolled in Medicare?

No. Mark Hennessey has opted out of Medicare through April 4, 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.

Q: When was this NPI record last updated?

The NPPES record for Mark Hennessey was last updated on September 21, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years 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.

Active since September 21, 2010Opted out of Medicare · through Apr 4, 2027

400 DOANSBURG RD, BREWSTER, NY 10509(845) 279-2995(845) 279-2077 Get Directions Write a Review

NPPES record last updated: September 21, 2010. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Mr. Mark William Hennessey Lcsw-r NPPES

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

MR. MARK WILLIAM HENNESSEY LCSW-R (NPI 1427366772) is an individual clinical provider in Brewster, New York, licensed in New York (070709-1) and active in the NPI registry since September 2010. He has opted out of Medicare through April 4, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1427366772

Entity TypeIndividualMale

Primary Taxonomy1041C0700X

Provider Legal NameMR. MARK WILLIAM HENNESSEYCredential: LCSW-R

Location Address400 DOANSBURG RDBrewster, NY 10509-5902

Mailing Address400 Doansburg RdBrewster, NY 10509-5902 · (845) 279-2995 · Fax (845) 279-2077

Phone(845) 279-2995

Fax(845) 279-2077

Sole ProprietorNo

Enumeration DateSeptember 21, 2010

✔ NPI 1427366772 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code1041C0700X

License✔ Licensed in NY · 070709-1

Definition

A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.

400 DOANSBURG RD, Brewster, NY 10509

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Providence Health Plan.Insurance ›

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

Mr. Mark William Hennessey Lcsw-r 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 April 4, 2019 through April 4, 2027.

Opt-Out Effective DateApril 4, 2019

Opt-Out In Effect ThroughApril 4, 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 10509 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

$0.00 typical visit price

range $61.88 – $187.05

Typical copayment $0.00 (range $15.47 – $46.76)

Most-billed visit code NA

Established Patient

$76.88 typical visit price

range $19.92 – $151.94

Typical copayment $19.22 (range $4.98 – $37.98)

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 20

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

GARY TYQUAN SMITH

Counselor