Quick answers
- Does Costas L. Constantinou accept Medicare assignment?
- Yes. Medicare's clinician data says Costas L. Constantinou accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Costas L. Constantinou see?
- In 2024, CMS data shows 308 Original Medicare patients and 671 services for Costas L. Constantinou. This counts Original Medicare only and measures volume, not quality.
- What is Costas L. Constantinou's NPI number?
- 1518970748. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Costas L. Constantinou, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 308 |
|---|---|
| Services billed to Medicare | 671 |
| Different services or procedures | 11 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)369 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)152 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)39 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)22 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)17 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)51%
- Arthritis44%
- Ischemic heart disease38%
- Chronic kidney disease32%
Hospitals where Costas L. Constantinou works
Medicare's Facility Affiliation Data lists Costas L. Constantinou at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Trinity Rock IslandRock Island, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140280
Practice locations
Addresses where Costas L. Constantinou is enrolled with Medicare (CMS data updated October 2, 2026).
- 2701 17th StRock Island, IL 61201 (309) 779‑5000
- 500 John Deere RdMoline, IL 61265 (309) 779‑5000
Group practices
Medicare enrollment lists Costas L. Constantinou as a member of this group (CMS data updated October 2, 2026).
- Trinity Medical Center99 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Hospice/Palliative Carealso
Other hematologist-oncologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Other clinicians in Trinity Medical Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518970748 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians