NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1679541841 MD
Verify on CMS → Luis Casas, MD
Internal Medicine Physician in Fargo, North Dakota.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 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
450
Medicare Part D claims · 25 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
29%
generic claims · 62% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
84/100
▲ 1 pts above national avg 83.1 · Above neutral
Industry payments
$1.2K
4 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Luis Casas, MD reported a CMS MIPS final score of 84/100 - above the 83.1 national average - and filed 450 Medicare Part D claims in 2023.
- 84/100
- MIPS score · +1 vs avg
- 450
- Part D claims, 2023
- 29%
- 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.
Luis Casas, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
84 42nd percentile higher than 42% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Luis Casas, MD sits
This provider among internal medicine physician peers
Across the 36,260 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Luis Casas, MD writes more Part D claims than 42% of them and scores higher on MIPS quality than 43% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one internal medicine physician peer from a representative sample of 60; the gold marker is Luis Casas, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Luis Casas, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 3 hospital affiliations - 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 Luis Casas, MD?
Near national averagePrimary specialty
Internal Medicine Physician
Medicare Part D claims
450 83% vs specialty avg
MIPS final score
84/100 0.9 pts vs avg
Specialty distribution in North Dakota
How Internal Medicine Physician compares to other specialties among North Dakota providers
Medicare quality performance, MIPS
Luis Casas, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 84/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Internal Medicine Physician) - 84/100 vs national avg 83.1
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).
Luis Casas, MD appears in the CMS NPPES registry as an Internal Medicine Physician provider holding MD credentials at 3955 56TH ST S STE D, Fargo, ND, 58104, with a listed phone of (701) 517-7500. NPI 1679541841 was issued on 03/14/2006.
Medicare Part D records for calendar year 2023 show 450 prescription claims written by this provider, covering 25 Medicare beneficiaries and totaling roughly $356K in drug spend, split 62% brand-name and 29% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 84/100 for the 2023 performance year (Quality 79.3, Cost 68.2), compared with the national average of 83.1.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1679541841 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 03/14/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
83.9833
Final Score
Avg: 83.1
79.2862
Quality
68.158
Cost
99
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Luis Casas, 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.
According to CMS billing records, Luis Casas, MD is affiliated with 3 Medicare-billing facilities across 2 states, 1 of which carry a CMS Hospital overall star rating.
Sanford Medical Center Fargo
★★★★☆ 4/5
West Fargo, ND
Acute Care Hospitals
CMS CCN: 350011
Sanford Bismarck
Bismarck, ND
Sanford Health OF Northern Minnesota
Bemidji, MN
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Luis Casas, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.2K
Largest payer
SANOFI-AVENTIS U.S. LLC
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 · Brand-heavy
Luis Casas, MD - brand share 62.0%
Internal Medicine Physician average
62% brand-name claims vs 29% generic, on 450 2023 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 2023.
450
Total Claims
$356K
Total Drug Cost
25
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 638
- Total Day Supply
- 18,673
- Brand vs Generic
- 62% brand / 29% generic
- Brand Drug Cost
- $334K
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 57.9 years
- Avg HCC Risk Score
- 1.55
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Luis Casas, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Levothyroxine Sodium
Levothyroxine Sodium
35 claims
- Ozempic
Ozempic
26 claims
- Lisinopril
Lisinopril
22 claims
- Novolog Flexpen
Novolog Flexpen
22 claims
- Jardiance
Jardiance
21 claims
- Humalog Kwikpen U-…
Humalog Kwikpen U-200
19 claims
- Victoza 3-Pak
Victoza 3-Pak
19 claims
- Metformin Hcl Er
Metformin Hcl Er
17 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 35 |
| Ozempic Semaglutide | 26 |
| Lisinopril | 22 |
| Novolog Flexpen Insulin Aspart | 22 |
| Jardiance Empagliflozin | 21 |
| Humalog Kwikpen U-200 Insulin Lispro | 19 |
| Victoza 3-Pak Liraglutide | 19 |
| Metformin Hcl Er Metformin Hcl | 17 |
| Novolog Insulin Aspart | 17 |
| Rosuvastatin Calcium | 16 |
* 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 Luis Casas, MD fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Luis Casas, MD's 450 claims are below the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in North Dakota
Other clinicians with the same primary specialty enrolled in North Dakota, drawn from the same CMS NPPES roster as Casas.
Dr. Suha Abu Khalaf
MD
Fargo, ND
Ahmed Abuzaanona
Fargo, ND
Dr. Kenneth Aduba
M.D
Grand Forks, ND
Dr. Ozheh Aghdasi
M.D.
Fargo, ND
Dr. Rita Ahmad
MD
Fargo, ND
Compare Internal Medicine 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 North Dakota medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal Medicine 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.
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Frequently Asked Questions
What is Luis Casas, MD's specialty? ▼
Luis Casas, MD specializes in Internal Medicine Physician and practices in Fargo, North Dakota. Credentials: MD.
How much does Luis Casas, MD prescribe under Medicare Part D? ▼
In 2023, Luis Casas, MD wrote 450 Medicare Part D claims totaling $356K in drug costs for 25 beneficiaries.
What is Luis Casas, MD's Medicare quality score? ▼
Luis Casas, MD has a CMS MIPS Final Score of 84/100 (Quality: 79.3, Cost: 68.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Luis Casas, MD located? ▼
Luis Casas, MD is located at 3955 56TH ST S STE D, Fargo, ND, 58104. Phone: (701) 517-7500.
What is Luis Casas, MD's NPI number? ▼
Luis Casas, MD's National Provider Identifier (NPI) is 1679541841, issued on 03/14/2006.
Does Luis Casas, MD prescribe more brand-name or generic drugs? ▼
Luis Casas, MD's prescribing is 62% brand-name and 29% generic drugs by claim count, with $334K in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Luis Casas, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Luis Casas, MD's most frequently prescribed drugs include Levothyroxine Sodium, Ozempic, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Luis Casas, MD accept Medicare? ▼
Luis Casas, MD appears in CMS Medicare data with 450 Part D claims and 25 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Luis Casas, MD's credentials? ▼
Luis Casas, MD's NPI is 1679541841 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.
- 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 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.