NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1124448246
Verify on CMS → Ashley Castillo
Internal Medicine Physician in Sacaton, 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 174,792 in Internal Medicine 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
1K
Medicare Part D claims · 64 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
67%
generic claims · 26% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
87/100
▲ 3 pts above national avg 83.5 · Above neutral
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Ashley Castillo reported a CMS MIPS final score of 87/100 - above the 83.5 national average - and filed 1,249 Medicare Part D claims in 2024.
- 87/100
- MIPS score · +3 vs avg
- 1K
- Part D claims, 2024
- 67%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Federal trust snapshot
What official records show about Ashley Castillo
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1124448246), first enumerated 04/17/2014.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,249 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 87/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1124448246 · Internal Medicine Physician
NPI-10 · ENUM-MID · TAX-MEGA · MIPS-ABOVE · RX-MID · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1124448246
- ENUM-MID 2014
- TAX-MEGA 175K Internal Medicine
- MIPS-ABOVE 87/100
- RX-MID 1,249
- BOOK-LIGHT 3,429 in Arizona
- PHOTO-FINISH Dino Cekro, M.D · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Castillo · this …
Castillo · this provider
87 MIPS pts
- Sara Stewart, DO…
Sara Stewart, DO
87 MIPS pts
- Dino Cekro, M.D …
Dino Cekro, M.D
87 MIPS pts
- Sumeesh Dhawan, …
Sumeesh Dhawan, M.D.
87 MIPS pts
- Khuong Phan, D.O…
Khuong Phan, D.O.
87 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Ashley Castillo's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
87 ≥ 49th percentile 49% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Ashley Castillo sits
This provider among internal medicine physician peers
Across the 34,612 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Ashley Castillo writes more Part D claims than 60% of them and scores higher on MIPS quality than 51% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one internal medicine physician peer from a representative sample of 60; the gold marker is Ashley Castillo. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Ashley Castillo practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Ashley Castillo?
High performer (top quartile)Primary specialty
Internal Medicine Physician
Medicare Part D claims
1,249 55% vs specialty avg
MIPS final score
87/100 3.5 pts vs avg
Specialty distribution in Arizona
How Internal Medicine Physician compares to other specialties among Arizona providers
Medicare quality performance, MIPS
Ashley Castillo's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 87/100
- vs 83.5 national avg · 2023 performance year
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 | 1124448246 |
|---|---|
| Specialty | Internal Medicine Physician |
| Gender | Female |
| NPI Issued | 04/17/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
86.9932
Final Score
Measured-score avg: 83.5
79.3582
Quality
53.9524
Cost
88
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Ashley Castillo 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.
Gila River Health Care Corporation
Sacaton, AZ
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Above average
Ashley Castillo - brand share 26.0%
Internal Medicine Physician average
26% brand-name claims vs 67% generic, on 1,249 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
1,249
Total Claims
$138K
Total Drug Cost
64
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,729.233
- Total Day Supply
- 48,376
- Brand vs Generic
- 26% brand / 67% generic
- Brand Drug Cost
- $128K
- Generic Drug Cost
- $7K
- Antibiotic Claims
- 17
Patient Demographics
- Average Patient Age
- 66.3 years
- Avg HCC Risk Score
- 2.52
- Gender Split
- 73% female / 27% male
- Age Distribution
- <65: 18, 65-74: 33, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Ashley Castillo prescribes most
Top Medicare Part D drugs by claim count, 2024
- Lisinopril
Lisinopril
85 claims
- Atorvastatin Calcium
Atorvastatin Calcium
77 claims
- Pantoprazole Sodium
Pantoprazole Sodium
58 claims
- Albuterol Sulfate …
Albuterol Sulfate Hfa
55 claims
- Amlodipine Besylate
Amlodipine Besylate
41 claims
- Tamsulosin Hcl
Tamsulosin Hcl
39 claims
- Gabapentin
Gabapentin
38 claims
- Lantus Solostar
Lantus Solostar
35 claims
| Drug | Claims |
|---|---|
| Lisinopril | 85 |
| Atorvastatin Calcium | 77 |
| Pantoprazole Sodium | 58 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 55 |
| Amlodipine Besylate | 41 |
| Tamsulosin Hcl | 39 |
| Gabapentin | 38 |
| Lantus Solostar Insulin Glargine,hum.Rec.Anlog | 35 |
| Simvastatin | 34 |
| Metformin Hcl Er Metformin Hcl | 33 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Ashley Castillo fits within the Internal Medicine Physician landscape nationally.
174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider
Ashley Castillo's 1,249 claims are below the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Castillo, both outside Arizona so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (87 here).
Same NPPES enumeration year (2014)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Castillo.
One of 3,429 Internal Medicine Physician providers enrolled in Arizona, 5 are shown here.
Dr. Daniel Aaronson
MD
Tucson, AZ
Dr. Jaber Abawi
MD
Payson, AZ
Dr. Demsas Abay
MD
Peoria, AZ
Firas Abbas
M.D. M.P.H.
Mesa, AZ
Dr. Hassan Abbas
D.O.
Mesa, AZ
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ashley Castillo's specialty? ▼
Ashley Castillo specializes in Internal Medicine Physician and practices in Sacaton, Arizona.
How much does Ashley Castillo prescribe under Medicare Part D? ▼
In 2024, Ashley Castillo wrote 1,249 Medicare Part D claims totaling $138K in drug costs for 64 beneficiaries.
What is Ashley Castillo's Medicare quality score? ▼
Ashley Castillo has a CMS MIPS Final Score of 87/100 (Quality: 79.4, Cost: 54). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Ashley Castillo located? ▼
Ashley Castillo is located at 483 W SEED FARM RD, Sacaton, AZ, 85147. Phone: (602) 528-1200.
What is Ashley Castillo's NPI number? ▼
Ashley Castillo's National Provider Identifier (NPI) is 1124448246, issued on 04/17/2014.
Does Ashley Castillo prescribe more brand-name or generic drugs? ▼
Ashley Castillo's prescribing is 26% brand-name and 67% generic drugs by claim count, with $128K in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does Ashley Castillo prescribe most often? ▼
Based on 2024 Medicare Part D data, Ashley Castillo's most frequently prescribed drugs include Lisinopril, Atorvastatin Calcium, Pantoprazole Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ashley Castillo accept Medicare? ▼
Ashley Castillo appears in CMS Medicare data with 1,249 Part D claims and 64 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ashley Castillo's credentials? ▼
Ashley Castillo's NPI is 1124448246. 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 (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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 August 2026 (NPPES) / 2024 (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 August 2026.