Mark Hollander, PH.D.
NPI 1619949419 · Clinical Psychologist · New York, NY
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Hollander, PH.D. is a Clinical Psychologist provider in New York, NY (NPI 1619949419).
Provider details
- NPI number
- 1619949419
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 011500 (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
20 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
- 2006-02-06
- Last updated
- 2013-10-03
Frequently asked questions
- What is Mark Hollander's NPI number?
- Mark Hollander's National Provider Identifier (NPI) is 1619949419, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Hollander's specialty?
- Mark Hollander is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Mark Hollander located?
- Mark Hollander's practice location on file with NPPES is 80 5th Ave, New York, NY 10011-8002.
- What is Mark Hollander's phone number?
- The practice phone number listed in the NPPES registry for Mark Hollander is (212) 969-8244.
- Does Mark Hollander accept Medicare?
- Mark Hollander is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Hollander's NPI active?
- Yes — Mark Hollander's NPI (1619949419) is active in the NPPES registry as of the last update on 2013-10-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.