NPI registry status
Active
2026 NPPES data Diagnostic Radiology Physician NPI 1265860449 M.D.
Verify on CMS → John Castiglia, M.D.
Diagnostic Radiology Physician in Scottsdale, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 39,551 in Diagnostic Radiology Physician, 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
33
Medicare Part D claims · Diagnostic Radiology Physician avg: 63
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
John Castiglia, M.D. filed 33 Medicare Part D claims in 2023 as a Diagnostic Radiology Physician in Scottsdale, Arizona.
- 33
- Part D claims, 2023
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.
John Castiglia, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
33 0th percentile higher than 0% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
John Castiglia, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about John Castiglia, M.D.?
Quality data not reportedPrimary specialty
Diagnostic Radiology Physician
Medicare Part D claims
33 48% vs specialty avg
Specialty distribution in Arizona
How Diagnostic Radiology Physician compares to other specialties among Arizona 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 Diagnostic Radiology Physician. 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).
John Castiglia, M.D. appears in the CMS NPPES registry as a Diagnostic Radiology Physician provider holding M.D. credentials at 5995 N. 78TH STREET, Scottsdale, AZ, 85250, with a listed phone of (925) 979-8538. NPI 1265860449 was issued on 10/24/2013.
Medicare Part D records for calendar year 2023 show 33 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $7K in drug spend.
Diagnostic Radiology Physician is a mid-sized specialty nationwide, with 39,551 enrolled providers across 56 states and an average of 63 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1265860449 |
|---|---|
| Specialty | Diagnostic Radiology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/24/2013 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
33
Total Claims
$7K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 75
- Total Day Supply
- 2,079
- Generic Drug Cost
- $1K
Patient Demographics
- Average Patient Age
- 70.0 years
- Avg HCC Risk Score
- 1.07
Diagnostic Radiology Physician Overview
How John Castiglia, M.D. fits within the Diagnostic Radiology Physician landscape nationally.
39,551
Diagnostic Radiology Physician Providers in US
56
States with Diagnostic Radiology Physician
63
Avg Claims per Provider
John Castiglia, M.D.'s 33 claims are below the specialty average of 63.
Nearby Diagnostic Radiology Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Castiglia.
Abdelrahman Abdalla
Tucson, AZ
Dr. Thomas Abram
MD
Tucson, AZ
Dr. Artyom Abramyan
DO
Tucson, AZ
Dr. William Acker
M.D.
Phoenix, AZ
Cameron Adler
Scottsdale, AZ
Compare Diagnostic Radiology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Arizona medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Diagnostic Radiology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
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How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
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Frequently Asked Questions
What is John Castiglia, M.D.'s specialty? ▼
John Castiglia, M.D. specializes in Diagnostic Radiology Physician and practices in Scottsdale, Arizona. Credentials: M.D..
How much does John Castiglia, M.D. prescribe under Medicare Part D? ▼
In 2023, John Castiglia, M.D. wrote 33 Medicare Part D claims totaling $7K in drug costs for N/A beneficiaries.
Where is John Castiglia, M.D. located? ▼
John Castiglia, M.D. is located at 5995 N. 78TH STREET, Scottsdale, AZ, 85250. Phone: (925) 979-8538.
What is John Castiglia, M.D.'s NPI number? ▼
John Castiglia, M.D.'s National Provider Identifier (NPI) is 1265860449, issued on 10/24/2013.
How many Diagnostic Radiology Physician providers are there in the US? ▼
There are 39,551 Diagnostic Radiology Physician providers across 56 states in the US. The average Diagnostic Radiology Physician provider writes 63 Medicare Part D claims per year.
Does John Castiglia, M.D. accept Medicare? ▼
John Castiglia, M.D. appears in CMS Medicare data with 33 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Castiglia, M.D.'s credentials? ▼
John Castiglia, M.D.'s NPI is 1265860449 with credentials M.D.. 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
Compiled from official public sources by the PlainDoctor editorial team.
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.