John Michael Ioannou, M.D.
Nephrology Physician · Rockville Centre, NY
John Michael Ioannou, M.D. is a nephrology physician with a practice address in Rockville Centre, New York, and NPI 1851330328, issued on Jun 6, 2006. Check the license (New York 231998, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- John Michael Ioannou
- Credential
- M.D.
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 231998 NY
Self-reported in NPPES; status is on the state search - Practice location
- 242 Merrick RD, Rockville Centre, NY 11570
- Phone
- (516) 764-7070
- Enumerated
- Jun 6, 2006
- Record last updated
- Oct 30, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (516) 764-7073
- Medicare enrollment
- Enrolled (PECOS I20060627000035); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,049 in New York → Look up another NPI →
Also registered at 242 Merrick RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Varvara Alexiadis, MDEndocrinology, Diabetes & Metabolism Physician1033462684
- Timothy Chen, M.D.Cardiovascular Disease Physician1720079056
- Lyndsey Chernick, NPFamily Nurse Practitioner1477934917
- Micky Chun, MDNephrology Physician1306821434
- Stephen Covey, M.D.Cardiovascular Disease Physician1114917804
- Marjory David, FNPFamily Nurse Practitioner1801996335
Verify John Michael Ioannou 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 231998Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
76% more Medicare Part D claims than the average nephrology physician in 2024
2,573 Medicare Part D claims for 459 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. 24 claims were for opioids.
Most prescribed
- Farxiga159 claims
- Losartan Potassium146 claims
- Amlodipine Besylate129 claims
- Furosemide115 claims
- Allopurinol99 claims
- Atorvastatin Calcium86 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.
Industry payments in 2024: $1,210.90
54 payments; by number, the most common kind was food and beverage; the largest payer was Bayer Healthcare Pharmaceuticals Inc. The 8,230 providers of this specialty with any payment received $3,091.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Prine Health Medical Group, PLLCBayside, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Michael Ioannou among 1,049 nephrology physician records in New York
John Michael Ioannou, M.D. is one of 1,049 nephrology physician records with a practice address in New York. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 47% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 73% of these records are
- Graduated2001 · median 1999 among the 764 with a school on file
- Record last updated2009 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in New York
There are 1,049 nephrology physician records in New York.
All 1,049 in New York → Every provider in Rockville Centre → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Micky Chun, MDRockville Centre, NY 115701306821434
- Brian Erlich, DORockville Centre, NY 115701639172547
- Lawrence Kleinman, MDRockville Centre, NY 115701285619098
- Douglas Lax, DORockville Centre, NY 115701093790800
- Norma Wenger, MDRockville Centre, NY 115701427035971
- James McGee, MD, MSCROceanside, NY 115721114487394
- Lance Rubel, MDRoslyn, NY 115761568406460
- Robert Rosen, M.D.Long Beach, NY 115611275714776
Common questions
What is John Michael Ioannou, M.D.'s NPI number?
John Michael Ioannou, M.D.'s National Provider Identifier (NPI) is 1851330328, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Michael Ioannou, M.D. located?
The NPPES record lists a practice address at 242 Merrick RD, Rockville Centre, NY, 11570. Phone: (516) 764-7070. Providers update this record themselves, so call before visiting.
How can I verify John Michael Ioannou, M.D.'s license?
NPPES lists New York license number 231998, 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 John Michael Ioannou, M.D. prescribe under Medicare Part D?
In 2024, John Michael Ioannou, M.D. had 2,573 Medicare Part D claims for 459 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.