NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1043276249 MD
Verify on CMS → Romualdo Aragon, MD
Internal Medicine Physician in Las Vegas, Nevada.
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
7K
Medicare Part D claims · 398 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
87%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
99.7/100
▲ 16 pts above national avg 83.5 · Exceptional
Industry payments
$827.11
46 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Romualdo Aragon, MD reported a CMS MIPS final score of 99.7/100 - above the 83.5 national average - and filed 6,612 Medicare Part D claims in 2024.
- 99.7/100
- MIPS score · +16 vs avg
- 7K
- Part D claims, 2024
- 87%
- 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 Romualdo Aragon, MD
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 1043276249), first enumerated 04/25/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 6,612 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 99.7/100 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
Industry payment transparency
$827.11 in reported industry payments (46 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 1043276249 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · MIPS-ELITE · RX-MID · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1043276249
- ENUM-LEGACY 2006
- TAX-MEGA 175K Internal Medicine
- MIPS-ELITE 99.7/100
- RX-MID 6,612
- BOOK-LIGHT 1,376 in Nevada
- PHOTO-FINISH Nehal Altaie · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Mohammad Mirza ·…
Mohammad Mirza
99.6 MIPS pts
- Aragon · this pr…
Aragon · this provider
99.7 MIPS pts
- Nehal Altaie · h…
Nehal Altaie
99.7 MIPS pts
- Hema Vankayala ·…
Hema Vankayala
99.7 MIPS pts
- Alina Markova · …
Alina Markova
99.7 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Romualdo Aragon, MD'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.
100 ≥ 91st percentile 91% 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 Romualdo Aragon, MD 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, Romualdo Aragon, MD writes more Part D claims than 86% of them and scores higher on MIPS quality than 92% - 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 Romualdo Aragon, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Romualdo Aragon, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Romualdo Aragon, MD?
High performer (top quartile)Primary specialty
Internal Medicine Physician
Medicare Part D claims
6,612 137% vs specialty avg
MIPS final score
99.7/100 16.2 pts vs avg
Specialty distribution in Nevada
How Internal Medicine Physician compares to other specialties among Nevada providers
Medicare quality performance, MIPS
Romualdo Aragon, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 99.7/100
- 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 | 1043276249 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 04/25/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
99.651
Final Score
Measured-score avg: 83.5
100
Quality
90.0443
Cost
100
Promoting Interoperability
Reporting: Individual
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Romualdo Aragon, MD. Source: openpaymentsdata.cms.gov.
Total received
$827
Largest payer
AstraZeneca Pharmaceuticals LP
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Brand vs generic prescribing mix · Typical
Romualdo Aragon, MD - brand share 12.0%
Internal Medicine Physician average
12% brand-name claims vs 87% generic, on 6,612 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.
6,612
Total Claims
$839K
Total Drug Cost
398
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 17,371.6
- Total Day Supply
- 514,578
- Brand vs Generic
- 12% brand / 87% generic
- Brand Drug Cost
- $764K
- Generic Drug Cost
- $70K
- Opioid Claims
- 17 (0.3% rate)
- Antibiotic Claims
- 111
Patient Demographics
- Average Patient Age
- 73.2 years
- Avg HCC Risk Score
- 0.95
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 19, 65-74: 231, 75-84: 119, 85+: 29
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Romualdo Aragon, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
753 claims
- Losartan Potassium
Losartan Potassium
557 claims
- Amlodipine Besylate
Amlodipine Besylate
366 claims
- Metformin Hcl 260
Metformin Hcl
260 claims
- Allopurinol 224
Allopurinol
224 claims
- Levothyroxine Sodium 205
Levothyroxine Sodium
205 claims
- Alendronate Sodium 174
Alendronate Sodium
174 claims
- Metformin Hcl Er 172
Metformin Hcl Er
172 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 753 |
| Losartan Potassium | 557 |
| Amlodipine Besylate | 366 |
| Metformin Hcl | 260 |
| Allopurinol | 224 |
| Levothyroxine Sodium | 205 |
| Alendronate Sodium | 174 |
| Metformin Hcl Er Metformin Hcl | 172 |
| Metoprolol Succinate | 144 |
| Lisinopril | 132 |
* 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 Romualdo Aragon, MD 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
Romualdo Aragon, MD's 6,612 claims are above the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Aragon, both outside Nevada so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (99.7 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Nevada
Other clinicians with the same primary specialty enrolled in Nevada, drawn from the same CMS NPPES roster as Aragon.
One of 1,376 Internal Medicine Physician providers enrolled in Nevada, 5 are shown here.
Dr. Cherylene Abalos
D.O.
Nellis Afb, NV
Dr. Kasey Abanonu
MD
Las Vegas, NV
Dr. Muhammad Abbas
MD
Las Vegas, NV
Dr. Sherif Abdou
M.D.
Las Vegas, NV
Dr. Ijaz Abid
MD
North Las Vegas, NV
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Romualdo Aragon, MD's specialty? ▼
Romualdo Aragon, MD specializes in Internal Medicine Physician and practices in Las Vegas, Nevada. Credentials: MD.
How much does Romualdo Aragon, MD prescribe under Medicare Part D? ▼
In 2024, Romualdo Aragon, MD wrote 6,612 Medicare Part D claims totaling $839K in drug costs for 398 beneficiaries.
What is Romualdo Aragon, MD's Medicare quality score? ▼
Romualdo Aragon, MD has a CMS MIPS Final Score of 99.7/100 (Quality: 100, Cost: 90). 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 Romualdo Aragon, MD located? ▼
Romualdo Aragon, MD is located at 1641 E FLAMINGO RD STE 11, Las Vegas, NV, 89119. Phone: (702) 737-9520.
What is Romualdo Aragon, MD's NPI number? ▼
Romualdo Aragon, MD's National Provider Identifier (NPI) is 1043276249, issued on 04/25/2006.
Does Romualdo Aragon, MD prescribe more brand-name or generic drugs? ▼
Romualdo Aragon, MD's prescribing is 12% brand-name and 87% generic drugs by claim count, with $764K in brand drug costs.
Does Romualdo Aragon, MD prescribe opioids? ▼
Yes, Romualdo Aragon, MD had 17 opioid claims in 2024 with an opioid prescribing rate of 0.3%.
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 Romualdo Aragon, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Romualdo Aragon, MD's most frequently prescribed drugs include Atorvastatin Calcium, Losartan Potassium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Romualdo Aragon, MD accept Medicare? ▼
Romualdo Aragon, MD appears in CMS Medicare data with 6,612 Part D claims and 398 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Romualdo Aragon, MD's credentials? ▼
Romualdo Aragon, MD's NPI is 1043276249 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 (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.