Alexander Messer, LCSW
NPI 1083071021 · Clinical Social Worker · New York, NY
Enrolled with Medicare as Order and Referring Only - Clinical Social Worker · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Messer, LCSW is a Clinical Social Worker provider in New York, NY (NPI 1083071021).
Provider details
- NPI number
- 1083071021
- Entity type
- Individual
- Primary specialty
- Clinical Social WorkerBehavioral Health & Social Service Providers
- Credential
- LCSW
- Sex
- Male
- Sole proprietor
- Yes
- License
- 088583 (NY)
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
10 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
- 2016-01-21
- Last updated
- 2020-02-26
- Certified
- 2020-02-26
Frequently asked questions
- What is Alexander Messer's NPI number?
- Alexander Messer's National Provider Identifier (NPI) is 1083071021, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Messer's specialty?
- Alexander Messer is listed in the NPPES registry with a primary specialty of Clinical Social Worker (Behavioral Health & Social Service Providers).
- Where is Alexander Messer located?
- Alexander Messer's practice location on file with NPPES is 1301 5th Ave, New York, NY 10029-3119.
- What is Alexander Messer's phone number?
- The practice phone number listed in the NPPES registry for Alexander Messer is (212) 426-3400.
- Does Alexander Messer accept Medicare?
- Alexander Messer is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Messer's NPI active?
- Yes — Alexander Messer's NPI (1083071021) is active in the NPPES registry as of the last update on 2020-02-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.