John Ioannou, M.D.
NPI 1851330328 · Nephrology Physician · Rockville Centre, NY
Enrolled with Medicare as Practitioner - Nephrology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Ioannou, M.D. is a Nephrology Physician provider in Rockville Centre, NY (NPI 1851330328).
Provider details
- NPI number
- 1851330328
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 231998 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,680 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 828 | $87 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 596 | $123 |
| Chronic Care Management Services, First 20 Minutes of Clinical Staff Time Directed By Health Care Professional, Per Calendar Month99490 | 364 | $63 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 351 | $131 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 320 | $9 |
| Dialysis Services, 4 Or More Physician Visits Per Month (20 Years Or Older)90960 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 57 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dapagliflozin Propanediolbrand: Farxiga | 159 | 48 |
| Losartan Potassium | 146 | 46 |
| Amlodipine Besylate | 129 | 51 |
| Furosemide | 115 | 46 |
| Allopurinol | 99 | 30 |
| Atorvastatin Calcium | 86 | 30 |
| Chlorthalidone | 82 | 30 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,211 across 54 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-06
- Last updated
- 2009-10-30
Frequently asked questions
- What is John Ioannou's NPI number?
- John Ioannou's National Provider Identifier (NPI) is 1851330328, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Ioannou's specialty?
- John Ioannou is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is John Ioannou located?
- John Ioannou's practice location on file with NPPES is 242 Merrick Rd, Rockville Centre, NY 11570-5254.
- What is John Ioannou's phone number?
- The practice phone number listed in the NPPES registry for John Ioannou is (516) 764-7070.
- Does John Ioannou accept Medicare?
- John Ioannou is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Ioannou's NPI active?
- Yes — John Ioannou's NPI (1851330328) is active in the NPPES registry as of the last update on 2009-10-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.