Leonard I. Leven, M.D.
Child & Adolescent Psychiatry Physician · Old Greenwich, CT
Leonard I. Leven, M.D. is a child & adolescent psychiatry physician with a practice address in Old Greenwich, Connecticut, and NPI 1821098245, issued on Jul 28, 2005. Check the license (Connecticut 026744, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Leonard I. Leven
- Credential
- M.D.
- Primary taxonomy
- Child & Adolescent Psychiatry Physician 2084P0804X
- License numbers
- 026744 CT
167310 NY
Self-reported in NPPES; status is on the state search - Practice location
- 3 W End Ave, Old Greenwich, CT 06870
- Phone
- (203) 637-1486
- Enumerated
- Jul 28, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (203) 637-1486
- Entity
- Type 1 · individual
Also registered at 3 W End Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laura Dermer, LCSWClinical Social Worker1427125293
- Joanna MackenzieMarriage & Family Therapist1740950633
Verify Leonard I. Leven in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 026744Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average child & adolescent psychiatry physician in 2024
497 Medicare Part D claims for 40 beneficiaries, against an average of 504 among the 3,545 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims.
Most prescribed
- Fluoxetine Hcl53 claims
- Quetiapine Fumarate40 claims
- Pregabalin38 claims
- Venlafaxine Hcl30 claims
- Clozapine28 claims
- Alprazolam25 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Child & Adolescent Psychiatry Physician providers in Connecticut
There are 225 child & adolescent psychiatry physician records in Connecticut.
Other child & adolescent psychiatry physician records in Connecticut
- Patricia Aguayo, M.D.New Britain, CT1184931404
- Satwant Ahluwalia, M.D.Redding, CT1689972382
- Joel Albert, M.D,Weston, CT1720120041
- Ava Albrecht, M.D.New Canaan, CT1982766317
- Henry Alton Allen, MDMilford, CT1659393999
- Ahmad Almai, M.DSouthington, CT1376580209
- Tamela Amiri, M.D.Westport, CT1275780777
- Ravi Anand, MDNew Haven, CT1619325503
- Benjamin Anderson, MDHartford, CT1497098404
- Kammarauche Aneni, M.D.New Haven, CT1447678164
Common questions
What is Leonard I. Leven, M.D.'s NPI number?
Leonard I. Leven, M.D.'s National Provider Identifier (NPI) is 1821098245, issued on Jul 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Leonard I. Leven, M.D. located?
The NPPES record lists a practice address at 3 W End Ave, Old Greenwich, CT, 06870. Phone: (203) 637-1486. Providers update this record themselves, so call before visiting.
How can I verify Leonard I. Leven, M.D.'s license?
NPPES lists Connecticut license number 026744, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Leonard I. Leven, M.D. prescribe under Medicare Part D?
In 2024, Leonard I. Leven, M.D. had 497 Medicare Part D claims for 40 beneficiaries; the average among child & adolescent psychiatry physician prescribers was 504. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.