Nan Nally-Seif, LCSW
NPI 1578627030 · Clinical Social Worker · New York, NY
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Nan Nally-Seif, LCSW is a Clinical Social Worker provider in New York, NY (NPI 1578627030).
Provider details
- NPI number
- 1578627030
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- Yes
- License
- R015676 (NY)
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 tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-20
- Last updated
- 2014-01-22
Frequently asked questions
- What is Nan Nally-Seif's NPI number?
- Nan Nally-Seif's National Provider Identifier (NPI) is 1578627030, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Nan Nally-Seif's specialty?
- Nan Nally-Seif is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Nan Nally-Seif located?
- Nan Nally-Seif's practice location on file with NPPES is 19 W 34th St, New York, NY 10001-3006.
- What is Nan Nally-Seif's phone number?
- The practice phone number listed in the NPPES registry for Nan Nally-Seif is (212) 947-7111.
- Does Nan Nally-Seif accept Medicare?
- Nan Nally-Seif is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Nan Nally-Seif's NPI active?
- Yes — Nan Nally-Seif's NPI (1578627030) is active in the NPPES registry as of the last update on 2014-01-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.