Leonidas Diamantopoulos, MD
NPI 1295358273 · Internal Medicine Physician · Staten Island, NY
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leonidas Diamantopoulos, MD is a Internal Medicine Physician provider in Staten Island, NY (NPI 1295358273).
Provider details
- NPI number
- 1295358273
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 329062 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
6 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
351 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 | 167 | $88 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 104 | $132 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 45 | $128 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 19 | $124 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 16 | $147 |
Typical Medicare-allowed amounts for these services range $88–$147 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 16 | 14 |
| Vemurafenibbrand: Zelboraf | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Additional practice locations (2)
- 200 1st St SwRochester, MN 55905-0001Phone: (507) 284-2511
- 3459 5th Ave Ste 9Pittsburgh, PA 15213-3236Phone: (412) 692-4888
Registry dates
- Enumerated
- 2020-05-25
- Last updated
- 2024-10-08
- Certified
- 2024-10-08
Frequently asked questions
- What is Leonidas Diamantopoulos's NPI number?
- Leonidas Diamantopoulos's National Provider Identifier (NPI) is 1295358273, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonidas Diamantopoulos's specialty?
- Leonidas Diamantopoulos is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Leonidas Diamantopoulos located?
- Leonidas Diamantopoulos's practice location on file with NPPES is 375 Seguine Ave, Staten Island, NY 10309-3932.
- What is Leonidas Diamantopoulos's phone number?
- The practice phone number listed in the NPPES registry for Leonidas Diamantopoulos is (718) 226-9000.
- Does Leonidas Diamantopoulos accept Medicare?
- Leonidas Diamantopoulos is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leonidas Diamantopoulos's NPI active?
- Yes — Leonidas Diamantopoulos's NPI (1295358273) is active in the NPPES registry as of the last update on 2024-10-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.