Sean Hennessey, LMSW
NPI 1518235175 · Addiction (Substance Use Disorder) Counselor · Staten Island, NY
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sean Hennessey, LMSW is a Addiction (Substance Use Disorder) Counselor provider in Staten Island, NY (NPI 1518235175).
Provider details
- NPI number
- 1518235175
- Entity type
- Individual
- Primary specialty
- Addiction (Substance Use Disorder) CounselorBehavioral Health & Social Service Providers
- Credential
- LMSW
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
14 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
371 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Psychotherapy, 45 Minutes90834 | 187 | $79 |
| Psychiatric Diagnostic Evaluation90791 | 98 | $131 |
| Psychotherapy, 1 Hour90837 | 86 | $113 |
Typical Medicare-allowed amounts for these services range $79–$131 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-12-09
- Last updated
- 2014-04-03
Frequently asked questions
- What is Sean Hennessey's NPI number?
- Sean Hennessey's National Provider Identifier (NPI) is 1518235175, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sean Hennessey's specialty?
- Sean Hennessey is listed in the NPPES registry with a primary specialty of Addiction (Substance Use Disorder) Counselor (Behavioral Health & Social Service Providers).
- Where is Sean Hennessey located?
- Sean Hennessey's practice location on file with NPPES is 3911 Richmond Ave, Staten Island, NY 10312-5110.
- What is Sean Hennessey's phone number?
- The practice phone number listed in the NPPES registry for Sean Hennessey is (718) 948-3232.
- Does Sean Hennessey accept Medicare?
- Sean Hennessey is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sean Hennessey's NPI active?
- Yes — Sean Hennessey's NPI (1518235175) is active in the NPPES registry as of the last update on 2014-04-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.