NPI registry status
Active
2026 NPPES data Student in an Organized Health Care Education/Training Program NPI 1538621842 MD
Verify on CMS → Arturo Castro Diaz, MD
Student in an Organized Health Care Education/Training Program in Bloomington, Indiana.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 331,274 in Student in an Organized Health Care Education/Training Program, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
343
Medicare Part D claims · 135 beneficiaries · Student in an Organized Health Care Education/Training Program avg: 459
What the federal data shows
Arturo Castro Diaz, MD filed 343 Medicare Part D claims in 2023 as a Student in an Organized Health Care Education/Training Program in Bloomington, Indiana.
- 343
- Part D claims, 2023
- ≥57th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
CMS NPPES provider registry desk
NPI 1538621842 · Student in an Organized Health Care Education/Training Program
NPI-10 · ENUM-RECENT · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1538621842
- ENUM-RECENT 2019
- TAX-MEGA 331K Student in
- RX-LIGHT 343
- BOOK-MID 5,466 in Indiana
- PHOTO-ENUM Matthew Narlesky · 2019
Arturo Castro Diaz, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
343 ≥ 57th percentile 57% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Arturo Castro Diaz, MD?
Quality data not reportedPrimary specialty
Student in an Organized Health Care Education/Training Program
Medicare Part D claims
343 25% vs specialty avg
Specialty distribution in Indiana
How Student in an Organized Health Care Education/Training Program compares to other specialties among Indiana providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Student in an Organized Health Care Education/Training Program. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1538621842 |
|---|---|
| Specialty | Student in an Organized Health Care Education/Training Program |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/04/2019 |
Hospital and facility affiliations
Facilities where Arturo Castro Diaz, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Indiana University Health Southern Indiana Physicians LLC
Bloomington, IN
IU Health Medical Group LLC
Indianapolis, IN
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
343
Total Claims
$26K
Total Drug Cost
135
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 395
- Total Day Supply
- 7,956
- Generic Drug Cost
- $6K
- Opioid Claims
- 15 (4.4% rate)
- Antibiotic Claims
- 96
Patient Demographics
- Average Patient Age
- 73.3 years
- Avg HCC Risk Score
- 2.29
- Gender Split
- 47% female / 53% male
- Age Distribution
- <65: 24, 65-74: 43, 75-84: 53, 85+: 15
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Arturo Castro Diaz, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
26 claims
- Atorvastatin Calcium
Atorvastatin Calcium
22 claims
- Cefpodoxime Proxetil
Cefpodoxime Proxetil
21 claims
- Eliquis
Eliquis
20 claims
- Pantoprazole Sodium
Pantoprazole Sodium
20 claims
- Amlodipine Besylate
Amlodipine Besylate
18 claims
- Prednisone
Prednisone
17 claims
- Torsemide
Torsemide
13 claims
| Drug | Claims |
|---|---|
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 26 |
| Atorvastatin Calcium | 22 |
| Cefpodoxime Proxetil | 21 |
| Eliquis Apixaban | 20 |
| Pantoprazole Sodium | 20 |
| Amlodipine Besylate | 18 |
| Prednisone | 17 |
| Torsemide | 13 |
| Doxycycline Hyclate | 12 |
| Metoprolol Succinate | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Student in an Organized Health Care Education/Training Program in IN →
All providers in Indiana →
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Student in an Organized Health Care Education/Training Program Overview
How Arturo Castro Diaz, MD fits within the Student in an Organized Health Care Education/Training Program landscape nationally.
331,274
Student in an Organized Health Care Education/Training Program Providers in US
55
States with Student in an Organized Health Care Education/Training Program
459
Avg Claims per Provider
Arturo Castro Diaz, MD's 343 claims are below the specialty average of 459.
Nationwide Student in an Organized Health Care Education/Training Program peers with similar MIPS or enrollment year
Two federal-record peer sets for Castro Diaz, both outside Indiana so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2019)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Student in an Organized Health Care Education/Training Program Providers in Indiana
Other clinicians with the same primary specialty enrolled in Indiana, drawn from the same CMS NPPES roster as Castro Diaz.
One of 5,466 Student in an Organized Health Care Education/Training Program providers enrolled in Indiana, 5 are shown here.
Frequently Asked Questions
What is Arturo Castro Diaz, MD's specialty? ▼
Arturo Castro Diaz, MD specializes in Student in an Organized Health Care Education/Training Program and practices in Bloomington, Indiana. Credentials: MD.
How much does Arturo Castro Diaz, MD prescribe under Medicare Part D? ▼
In 2023, Arturo Castro Diaz, MD wrote 343 Medicare Part D claims totaling $26K in drug costs for 135 beneficiaries.
Where is Arturo Castro Diaz, MD located? ▼
Arturo Castro Diaz, MD is located at 2651 E DISCOVERY PKWY, Bloomington, IN, 47408. Phone: (812) 676-4102.
What is Arturo Castro Diaz, MD's NPI number? ▼
Arturo Castro Diaz, MD's National Provider Identifier (NPI) is 1538621842, issued on 04/04/2019.
Does Arturo Castro Diaz, MD prescribe opioids? ▼
Yes, Arturo Castro Diaz, MD had 15 opioid claims in 2023 with an opioid prescribing rate of 4.4%.
How many Student in an Organized Health Care Education/Training Program providers are there in the US? ▼
There are 331,274 Student in an Organized Health Care Education/Training Program providers across 55 states in the US. The average Student in an Organized Health Care Education/Training Program provider writes 459 Medicare Part D claims per year.
What drugs does Arturo Castro Diaz, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Arturo Castro Diaz, MD's most frequently prescribed drugs include Amoxicillin-Clavulanate Potass, Atorvastatin Calcium, Cefpodoxime Proxetil. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Arturo Castro Diaz, MD accept Medicare? ▼
Arturo Castro Diaz, MD appears in CMS Medicare data with 343 Part D claims and 135 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Arturo Castro Diaz, MD's credentials? ▼
Arturo Castro Diaz, MD's NPI is 1538621842 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.