Stephen Marshall
NPI 1700590023 · Psychiatric/Mental Health Nurse Practitioner · Brookhaven, NY
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Marshall is a Psychiatric/Mental Health Nurse Practitioner provider in Brookhaven, NY (NPI 1700590023).
Provider details
- NPI number
- 1700590023
- Entity type
- Individual
- Primary specialty
- Psychiatric/Mental Health Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Male
- Sole proprietor
- Yes
- License
- F40445-01 (NY)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
3 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$33 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-01-11
- Last updated
- 2023-01-11
- Certified
- 2023-01-11
Frequently asked questions
- What is Stephen Marshall's NPI number?
- Stephen Marshall's National Provider Identifier (NPI) is 1700590023, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Marshall's specialty?
- Stephen Marshall is listed in the NPPES registry with a primary specialty of Psychiatric/Mental Health Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Stephen Marshall located?
- Stephen Marshall's practice location on file with NPPES is 9 Newey Ln, Brookhaven, NY 11719-9634.
- What is Stephen Marshall's phone number?
- The practice phone number listed in the NPPES registry for Stephen Marshall is (631) 946-9800.
- Does Stephen Marshall accept Medicare?
- Stephen Marshall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Marshall's NPI active?
- Yes — Stephen Marshall's NPI (1700590023) is active in the NPPES registry as of the last update on 2023-01-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.