Jonathan Austin Deassis, MD
Emergency Medicine Physician · Stony Brook, NY
Jonathan Austin Deassis, MD is an emergency medicine physician with a practice address in Stony Brook, New York, and NPI 1689178980, issued on Mar 21, 2018. Check the license (New York 308087, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Jonathan Austin Deassis
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 308087 NY
Self-reported in NPPES; status is on the state search - Practice location
- 101 Nicolls RD RM 80, Stony Brook, NY 11794
- Phone
- (631) 444-3880
- Enumerated
- Mar 21, 2018
- Record last updated
- May 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (631) 444-3919
- Medicare enrollment
- Enrolled (PECOS I20210519001885); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 5,025 in New York → Look up another NPI →
Also registered at 101 Nicolls RD RM 80
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jonathan Austin Deassis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 308087Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average emergency medicine physician in 2024
26 Medicare Part D claims for 23 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- Icahn School OF Medicine AT Mount SinaiNew York, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan Austin Deassis among 5,025 emergency medicine physician records in New York
Jonathan Austin Deassis, MD is one of 5,025 emergency medicine physician records with a practice address in New York. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 75% of them.
- NPI issued2018 · 75% of these records are older, 21% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2018 · median 2013 among the 3,232 with a school on file
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
116 emergency medicine physician records list a practice address in Stony Brook
They are 116 of the 3,053 NPPES records with a practice address in Stony Brook, and 5,025 emergency medicine physician records in New York.
All 5,025 in New York → Every provider in Stony Brook → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Abida Butler, M.D.Stony Brook, NY 117941982683173
- Christopher Carleo, M.D.Stony Brook, NY 117941023044823
- Stuart Chale, M.D.Stony Brook, NY 117941861428765
- Michael Imperato, M.D.Stony Brook, NY 117941194791665
- Lester Kallus, M.D.Stony Brook, NY 117941154357887
- Melina Khwaja, M.D.Stony Brook, NY 117941164467544
- David Lawrence, DOStony Brook, NY 117941144273228
- Andrea Libutti, M.D.Stony Brook, NY 117941053349241
Common questions
What is Jonathan Austin Deassis, MD's NPI number?
Jonathan Austin Deassis, MD's National Provider Identifier (NPI) is 1689178980, issued on Mar 21, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan Austin Deassis, MD located?
The NPPES record lists a practice address at 101 Nicolls RD RM 80, Stony Brook, NY, 11794. Phone: (631) 444-3880. Providers update this record themselves, so call before visiting.
How can I verify Jonathan Austin Deassis, MD's license?
NPPES lists New York license number 308087, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jonathan Austin Deassis, MD prescribe under Medicare Part D?
In 2024, Jonathan Austin Deassis, MD had 26 Medicare Part D claims for 23 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.