Quick answers
- Does Abel R. Castellano accept Medicare assignment?
- Yes. Medicare's clinician data says Abel R. Castellano 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 Abel R. Castellano see?
- In 2024, CMS data shows 2,487 Original Medicare patients and 4,116 services for Abel R. Castellano. This counts Original Medicare only and measures volume, not quality.
- What is Abel R. Castellano's NPI number?
- 1508838145. 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 Abel R. Castellano, 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 | 2,487 |
|---|---|
| Services billed to Medicare | 4,116 |
| Different services or procedures | 177 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- X-ray of chest, 1 view (71045)558 services
- Screening mammography (77067)352 services
- Screening 3d breast mammography (77063)344 services
- Dxa bone density measurement of hip, pelvis, spine (77080)271 services
- X-ray of chest, 2 views (71046)191 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%
- Arthritis53%
- Diabetes35%
- Chronic kidney disease31%
- Ischemic heart disease30%
Hospitals where Abel R. Castellano works
Medicare's Facility Affiliation Data lists Abel R. Castellano 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.
- Javon Bea HospitalRockford, IL · Acute Care Hospital · closed, according to its website · CCN 140239
- OSF Saint Elizabeth MDL CenterPeru, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140110
- OSF Saint Katharine Medical CenterDixon, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140012
- Saint Anthony Medical CenterRockford, IL · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 140233
- UW HealthRockford, IL · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 140228
Practice locations
Addresses where Abel R. Castellano is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 8; the Medicare profile lists all.
- 215 E 1st StDixon, IL 61021 (815) 288‑5531
- 305 Joe Dr EAmboy, IL 61310 (815) 857‑3044
- 403 E 1st StDixon, IL 61021 (815) 288‑5531
- 5666 E State StRockford, IL 61108 (815) 921‑8929
- 5666 E State St, St AnthonysRockford, IL 61108 (815) 226‑2000
Group practices
Medicare enrollment lists Abel R. Castellano as a member of these groups (CMS data updated October 2, 2026).
- OSF Multi-Specialty Group2,114 clinicians in the group
- Rockford Radiology Assoc43 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Dixon
Clinicians with the same Medicare primary specialty in Dixon, IL — not a recommendation.
Other clinicians in OSF Multi-Specialty Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| 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) | 1508838145 |
| 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