Diana Leondis, LMHC
NPI 1639762909 · Mental Health Counselor · Garden City, NY
Diana Leondis, LMHC is a Mental Health Counselor provider in Garden City, NY (NPI 1639762909).
Provider details
- NPI number
- 1639762909
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Credential
- LMHC
- Sex
- Female
- Sole proprietor
- Yes
- License
- 011029 (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
5 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
- 2021-02-17
- Last updated
- 2023-02-24
- Certified
- 2023-02-24
Frequently asked questions
- What is Diana Leondis's NPI number?
- Diana Leondis's National Provider Identifier (NPI) is 1639762909, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Diana Leondis's specialty?
- Diana Leondis is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is Diana Leondis located?
- Diana Leondis's practice location on file with NPPES is 142 Tullamore Rd, Garden City, NY 11530-1139.
- What is Diana Leondis's phone number?
- The practice phone number listed in the NPPES registry for Diana Leondis is (516) 650-3550.
- Is Diana Leondis's NPI active?
- Yes — Diana Leondis's NPI (1639762909) is active in the NPPES registry as of the last update on 2023-02-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.