Jonathan M. Horowitz, M.D.
Psychiatry Physician · Westport, CT
Jonathan M. Horowitz, M.D. is a psychiatry physician with a practice address in Westport, Connecticut, and NPI 1174500185, issued on Dec 30, 2005. Check the license (Connecticut 048165, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Jonathan M. Horowitz
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 048165 CT
Self-reported in NPPES; status is on the state search - Practice location
- 840 Post RD E, Westport, CT 06880
- Phone
- (203) 993-0024
- Enumerated
- Dec 30, 2005
- Record last updated
- Mar 3, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (815) 717-7746
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 1,174 in Connecticut → Look up another NPI →
Also registered at 840 Post RD E
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Abby Adis, MSWClinical Social Worker1003842105
- Alexandra Grundy, LCSWClinical Social Worker1245094366
- Jessica Halmeck, LCSWClinical Social Worker1043966617
- Jacqueline Katz, LCSWClinical Social Worker1700493467
- Allyson Maida, LCSWClinical Social Worker1386201358
- Colleen Maloney, LCSWClinical Social Worker1356042931
Verify Jonathan M. Horowitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 048165Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average psychiatry physician in 2024
84 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Clonazepam21 claims
- Gabapentin14 claims
- Bupropion Xl11 claims
- Citalopram Hbr11 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.
Jonathan M. Horowitz among 1,174 psychiatry physician records in Connecticut
Jonathan M. Horowitz, M.D. is one of 1,174 psychiatry physician records with a practice address in Connecticut. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 43% of these records are
- Record last updated2014 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
38 psychiatry physician records list a practice address in Westport
They are 38 of the 886 NPPES records with a practice address in Westport, and 1,174 psychiatry physician records in Connecticut.
All 1,174 in Connecticut → Every provider in Westport → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Jill Barron, M.D.Westport, CT 068801346260015
- Kay Cowan, MDWestport, CT 068801003980301
- Mohamed Elsamra, M.D.Westport, CT 068801457464406
- Jacques Germain, M.D.Westport, CT 068801427122688
- Stewart Levine, MDWestport, CT 068801356350169
- Mikhail Magid, M.D.Westport, CT 068801528132685
- John Moore, M.D.Westport, CT 068801578626214
- Farin Nejad, M.D.Westport, CT 068801265501118
Common questions
What is Jonathan M. Horowitz, M.D.'s NPI number?
Jonathan M. Horowitz, M.D.'s National Provider Identifier (NPI) is 1174500185, issued on Dec 30, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan M. Horowitz, M.D. located?
The NPPES record lists a practice address at 840 Post RD E, Westport, CT, 06880. Phone: (203) 993-0024. Providers update this record themselves, so call before visiting.
How can I verify Jonathan M. Horowitz, M.D.'s license?
NPPES lists Connecticut license number 048165, 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 Jonathan M. Horowitz, M.D. prescribe under Medicare Part D?
In 2024, Jonathan M. Horowitz, M.D. had 84 Medicare Part D claims; the average among psychiatry physician prescribers was 1,000. 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.