MR. MARK WILLIAM HENNESSEY LCSW-R
NPI 1427366772
Social Worker - Clinical in Brewster, NY
NPI Status: Active since September 21, 2010
Contact Information
400 DOANSBURG RD
BREWSTER, NY
ZIP 10509
Phone: (845) 279-2995
Fax: (845) 279-2077
- Individual
- Male
- Social Worker
- Clinical
- PECOS Enrolled
- Opted-Out Medicare
About MARK HENNESSEY
This page provides the complete NPI Profile along with additional information for Mark Hennessey, a provider established in Brewster, New York with a medical specialization in Social Worker, focusing in clinical . The healthcare provider is registered in the NPI registry with number 1427366772 assigned on September 2010. The practitioner's primary taxonomy code is 1041C0700X with license number 070709-1 (NY). The provider is registered as an individual and his NPI record was last updated 15 years ago.
- NPI
- 1427366772
- Provider Name
- MR. MARK WILLIAM HENNESSEY LCSW-R
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 400 DOANSBURG RD BREWSTER, NY 10509
- Location Phone
- (845) 279-2995
- Location Fax
- (845) 279-2077
- Mailing Address
- 400 DOANSBURG RD BREWSTER, NY 10509
- Mailing Phone
- (845) 279-2995
- Mailing Fax
- (845) 279-2077
- Is Sole Proprietor?
- No
- Enumeration Date
- 09-21-2010
- Last Update Date
- 09-21-2010
- Code Navigator
A clinical social worker like Mark Hennessey is licensed to diagnose and treat mental, behavioral, and emotional disorders. A clinical social worker helps patients develop strategies to change behavior or cope with difficult situations and refer patients to other resources or services, such as support groups or other mental health professionals.
The provider doesn't accept Medicare and has signed an affidavit to be excluded from the Medicare program. If you are a Medicare beneficiary this means a provider can charge whatever they want for services rendered but must follow certain rules to do so. Mark Hennessey opted out of Medicare effective on 04-04-2019 until 04-04-2027. Opt out periods last for two years and cannot be terminated unless the provider is opting out for the very first time and the affidavit is terminated no later than 90 days after the opt out effective date. Opt-out affidavits might renew automatically renew every two years. The provider opted out of Medicare but is permitted to order and refer services to other healthcare providers.
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Social Worker Clinical
- Taxonomy Code
- 1041C0700X
- Type
- Behavioral Health & Social Service Providers
- License No.
- 070709-1
- License State
- NY
- Taxonomy Description
- 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.
Medicare Participation & PECOS Enrollment Status
Mark Hennessey is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Is the provider registered in PECOS? Yes
Opted-Out of Medicare? Yes
Opt-Out Effective Date: 04-04-2019
Opt-Out End Date: 04-04-2027
Eligible to Order and Refer? Yes
Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): No
Eligible to Order or Refer Power Mobility Devices: No
Physician Visit Costs
The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.
For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.
The prices below reflect the costs for new and established patients in the 10509 ZIP code area.
New Patients Visit Costs *
The most utilized procedure code for new patients office visits is NA
- Average New Patient Price $0
- Minimum New Patient Price $61.88
- Maximum New Patient Price $187.05
- Average New Patient Copayment $0
- Minimum New Patient Copayment $15.47
- Maximum New Patient Copayment $46.76
Established Patients Visit Costs *
The most utilized procedure code for established patients office visits is 99213
- Average Established Patient Price $76.88
- Minimum Established Patient Price $19.92
- Maximum Established Patient Price $151.94
- Average Established Patient Copayment $19.22
- Minimum Established Patient Copayment $4.98
- Maximum Established Patient Copayment $37.98
* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.
Reviews for MR. MARK WILLIAM HENNESSEY LCSW-R
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NPI Validation Check Digit Calculation
The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.
| Start with the original NPI number, the last digit is the check digit and is not used in the calculation. | |||||||||
| 1 | 4 | 2 | 7 | 3 | 6 | 6 | 7 | 7 | 2 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 4 | 4 | 7 | 6 | 6 | 12 | 7 | 14 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 4 + 4 + 7 + 6 + 6 + 1 + 2 + 7 + 1 + 4 + 24 = 68 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 70 - 68 = 2 | 2 | ||||||||
The NPI number 1427366772 is valid because the calculated check digit 2 using the Luhn validation algorithm matches the last digit of the original NPI number.
Other Providers at the Same Location
The following 20 providers are registered at the same or nearby location.
| NPI | Name / Type | Taxonomy | Address |
|---|---|---|---|
| 1649300658 | AGNES JUHASZ MD Individual | Psychiatry & Neurology (Child & Adolescent Psychiatry) | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1720291446 | DR. JAY DAVIDOWITZ PH.D. Individual | Psychologist (Clinical) | 400 DOANSBURG RD BOX 719 BREWSTER, NY 10509 (845) 279-2995 |
| 1790974327 | GREEN CHIMNEYS CHILDRENS SERVICES Organization | Residential Treatment Facility, Intellectual and/or Developmental Disabilities | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1265672158 | GREEN CHIMNEYS CHILDRENS SERVICES Organization | Foster Care Agency | 400 DOANSBURG RD CALLER BOX 719 BREWSTER, NY 10509 (845) 279-2995 |
| 1841590437 | MS. ESTHER MARIE KNUDSON MS OTR/L Individual | Occupational Therapist | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-3077 |
| 1386922169 | LISA MARY SERLIN O.T.R. Individual | Occupational Therapist | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1568743888 | MS. ALEXANDRA MINDY MARISE BIALKE MA, OTR/L Individual | Occupational Therapist | 400 DOANSBURG RD BOX 719, GREEN CHIMNEYS BREWSTER, NY 10509 (845) 279-2995 |
| 1174806392 | MS. DENISE LUFT LMHC Individual | Counselor (Mental Health) | 400 DOANSBURG RD CALL BOX 719 BREWSTER, NY 10509 (845) 279-2995 |
| 1376813741 | JESSICA ANNE KOTZKER Individual | Social Worker | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1104196997 | MRS. KRISTIN BOYLE LICARDI LCSW Individual | Social Worker (Clinical) | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1902177009 | MISS KATHERINE M KENNY LMSW Individual | Social Worker | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1184996753 | MRS. GRACE EVA BEACH LMSW Individual | Social Worker | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1205187986 | AMANDA GUARRACINA CCC-SLP Individual | Speech-Language Pathologist | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1184921439 | MS. PATRICIA KARELL M.S. Individual | Counselor (School) | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1326392044 | ARIELLE EMILY TUNIS LMSW Individual | Social Worker | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1114344199 | ELIZA LOVE LMSW Individual | Social Worker | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1790983310 | MRS. BETH CAMANN LICSW Individual | Counselor (Mental Health) | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1861673485 | GREEN CHIMNEYS CHRILDRENS SERVICES Organization | Residential Treatment Facility, Emotionally Disturbed Children | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1790189363 | SHAUNA MCWILLIAMS Individual | Social Worker | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
| 1316342900 | MS. KIRSTEN MARIANNE MCGEE OTR/L Individual | Occupational Therapist | 400 DOANSBURG RD BREWSTER, NY 10509 (845) 279-2995 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1427366772, enumerated in the NPI registry as an "individual" on September 21, 2010
The provider is located at 400 Doansburg Rd Brewster, Ny 10509 and the phone number is (845) 279-2995
The provider's speciality is Social Worker with taxonomy code 1041C0700X with a focus in Clinical
Yes, as of June 20, 2025 the provider is registered in PECOS and is eligible to order health care services or supplies for Medicare patients. If you are a beneficiary the provider is eligible to order or refer: Part B Clinical Laboratory and Imaging and Durable Medical Equipment (DME).
Medicare beneficiaries should expect a typical cost of $0 with an average copayment of $0 for new patient appointments. Established patients should expect a typical charge of $76.88 and an average copayment of 19.22. Please review your insurance plan or contact the provider directly to determine your specific costs.
No, the provider signed an affidavit on April 04, 2019 to opt-out of the Medicare program. The provider is excluded from the Medicare program until April 04, 2027.
This NPI record was last updated on September 21, 2010. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
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