Irena Lisa Demario, D.O.
Internal Medicine Physician · Livingston, NJ
Irena Lisa Demario, D.O. is an internal medicine physician with a practice address in Livingston, New Jersey, and NPI 1538502075, issued on Apr 15, 2013. Check the license (New Jersey 25MB09844200, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Irena Lisa Demario
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 25MB09844200 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 94 Old Short Hills RD, Livingston, NJ 07039
- Phone
- (973) 322-5000
- Enumerated
- Apr 15, 2013
- Record last updated
- Jun 21, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160505001579); accepts Medicare assignment
- Medical or professional school
- New York College Of Osteo Medicine Of New York Institute Of Technology, 2013
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Also registered at 94 Old Short Hills RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Shirin AbbasiStudent in an Organized Health Care Education/Training Program1770416463
- Ayah AbdallahCertified Registered Nurse Anesthetist1700477379
- Ali AbdullahPeer Specialist1194560680
- Jan AcampadoGerontology Nurse Practitioner1487427001
- Lubab Al-Quraishi, MDStudent in an Organized Health Care Education/Training Program1568084572
- Laura Alban, PA-CPhysician Assistant1609482272
Verify Irena Lisa Demario in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MB09844200Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average internal medicine physician in 2024
127 Medicare Part D claims for 74 beneficiaries, against an average of 3,176 among the 108,855 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
- Rwjbh Emergency Medicine Associates, LLCElizabeth, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Irena Lisa Demario among 4,632 internal medicine physician records in New Jersey
Irena Lisa Demario, D.O. is one of 4,632 internal medicine physician records with a practice address in New Jersey. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 72% of them.
- NPI issued2013 · 72% of these records are older, 26% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2013 · median 2000 among the 3,132 with a school on file
- Record last updated2016 · 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 207R00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
66 internal medicine physician records list a practice address in Livingston
They are 66 of the 1,714 NPPES records with a practice address in Livingston, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in Livingston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nael Abutabikh, MDLivingston, NJ 070391235120155
- Donna Adamoli, M.D.Livingston, NJ 070391104880871
- Shrey Desai, M.D.Livingston, NJ 070391083651392
- Joseph Follo, MDLivingston, NJ 070391003874397
- Jacquelin Holubka, M.D.Livingston, NJ 070391174577373
- Eileen Klein, MDLivingston, NJ 070391336141928
- Kevin Leen, MDLivingston, NJ 070391699729293
- Liang Liang, M.D.Livingston, NJ 070391437132602
Common questions
What is Irena Lisa Demario, D.O.'s NPI number?
Irena Lisa Demario, D.O.'s National Provider Identifier (NPI) is 1538502075, issued on Apr 15, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Irena Lisa Demario, D.O. located?
The NPPES record lists a practice address at 94 Old Short Hills RD, Livingston, NJ, 07039. Phone: (973) 322-5000. Providers update this record themselves, so call before visiting.
How can I verify Irena Lisa Demario, D.O.'s license?
NPPES lists New Jersey license number 25MB09844200, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Irena Lisa Demario, D.O. prescribe under Medicare Part D?
In 2024, Irena Lisa Demario, D.O. had 127 Medicare Part D claims for 74 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.