Quick answers
- Does David A. Alejos Castillo accept Medicare assignment?
- Yes. Medicare's clinician data says David A. Alejos Castillo 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 David A. Alejos Castillo see?
- In 2024, CMS data shows 60 Original Medicare patients and 105 services for David A. Alejos Castillo. This counts Original Medicare only and measures volume, not quality.
- What is David A. Alejos Castillo's NPI number?
- 1104320506. 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 David A. Alejos Castillo, 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 | 60 |
|---|---|
| Services billed to Medicare | 105 |
| 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 moderate level of decision making, if using time, 30 minutes or more (99214)54 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)28 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%
- Arthritis58%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)52%
- Depression43%
- Chronic kidney disease43%
Hospitals where David A. Alejos Castillo works
Medicare's Facility Affiliation Data lists David A. Alejos Castillo 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.
- Greene County General HospitalLinton, IN · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 151317
- Indiana University HealthIndianapolis, IN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 150056
- Indiana University Health Bedford HospitalBedford, IN · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 151328
- Indiana University Health Bloomington HospitalBloomington, IN · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 150051
- Indiana University Health Paoli HospitalPaoli, IN · Critical Access Hospital · Emergency services: listed by Medicare · CCN 151306
Practice locations
Addresses where David A. Alejos Castillo is enrolled with Medicare (CMS data updated October 2, 2026).
- 1701 N Senate BlvdIndianapolis, IN 46202 (888) 484‑3258
- 2651 E Discovery PkwyBloomington, IN 47408 (812) 353‑9250
Group practices
Medicare enrollment lists David A. Alejos Castillo as a member of these groups (CMS data updated October 2, 2026).
- IU Health Medical Group LLC4,462 clinicians in the group
- Indiana University Health Southern Indiana Physicians LLC463 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Hematologyalso
- Internal Medicinealso
- Medical Oncologyalso
Other hematologist-oncologists in Indianapolis
Clinicians with the same Medicare primary specialty in Indianapolis, IN — not a recommendation.
Other clinicians in IU Health Medical Group LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2013 (13 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1104320506 |
| 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