Sydney Appelbaum, LCSW
NPI 1265004006 · Clinical Social Worker · Boston, MA
Enrolled with Medicare as Practitioner - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sydney Appelbaum, LCSW is a Clinical Social Worker provider in Boston, MA (NPI 1265004006).
Provider details
- NPI number
- 1265004006
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Female
- Sole proprietor
- Yes
Specialties & taxonomies
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
4 yrs in NPPES registry
- Profile completeness38% of score
83% 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
- 2021-07-12
- Last updated
- 2021-07-12
- Certified
- 2021-07-12
Frequently asked questions
- What is Sydney Appelbaum's NPI number?
- Sydney Appelbaum's National Provider Identifier (NPI) is 1265004006, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sydney Appelbaum's specialty?
- Sydney Appelbaum is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Sydney Appelbaum located?
- Sydney Appelbaum's practice location on file with NPPES is 450 Brookline Ave # Sw2, Boston, MA 02215-5450.
- What is Sydney Appelbaum's phone number?
- The practice phone number listed in the NPPES registry for Sydney Appelbaum is (617) 582-8772.
- Does Sydney Appelbaum accept Medicare?
- Sydney Appelbaum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sydney Appelbaum's NPI active?
- Yes — Sydney Appelbaum's NPI (1265004006) is active in the NPPES registry as of the last update on 2021-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.