NPI registry status
Active
2026 NPPES data Student in an Organized Health Care Education/Training Program NPI 1326453556 M.D.
Verify on CMS → Marc Armstrong, M.D.
Student in an Organized Health Care Education/Training Program in Aberdeen, South 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 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
276
Medicare Part D claims · 195 beneficiaries · Student in an Organized Health Care Education/Training Program avg: 459
MIPS score
75/100
▼ 8 pts below national avg 83.1 · Above neutral
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Marc Armstrong, M.D. reported a CMS MIPS final score of 75/100 - below the 83.1 national average - and filed 276 Medicare Part D claims in 2023.
- 75/100
- MIPS score · -8 vs avg
- 276
- 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.
Marc Armstrong, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
75 15th percentile higher than 15% 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 Marc Armstrong, M.D. sits
This provider among student in an organized health care education/training program peers
Across the 12,645 student in an organized health care education/training program providers who report both Medicare Part D prescribing and a MIPS quality score, Marc Armstrong, M.D. writes more Part D claims than 52% of them and scores higher on MIPS quality than 11% - placing this provider in the high-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 student in an organized health care education/training program peer from a representative sample of 60; the gold marker is Marc Armstrong, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Marc Armstrong, M.D.?
Below national averagePrimary specialty
Student in an Organized Health Care Education/Training Program
Medicare Part D claims
276 40% vs specialty avg
MIPS final score
75/100 8.1 pts vs avg
Specialty distribution in South Dakota
How Student in an Organized Health Care Education/Training Program compares to other specialties among South Dakota providers
Medicare quality performance, MIPS
Marc Armstrong, M.D.'s 2023 MIPS final score plotted against the Student in an Organized Health Care Education/Training Program national average
- MIPS Final Score
- 75/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Student in an Organized Health Care Education/Training Program) - 75/100 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).
Marc Armstrong, M.D. appears in the CMS NPPES registry as a Student in an Organized Health Care Education/Training Program provider holding M.D. credentials at 305 S STATE ST, Aberdeen, SD, 57401, with a listed phone of (605) 622-5100. NPI 1326453556 was issued on 06/26/2014.
Medicare Part D records for calendar year 2023 show 276 prescription claims written by this provider, covering 195 Medicare beneficiaries and totaling roughly $3K in drug spend, with an opioid prescribing rate of 14.1%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 75/100 for the 2023 performance year, compared with the national average of 83.1.
Student in an Organized Health Care Education/Training Program is a high-volume specialty nationwide, with 331,274 enrolled providers across 55 states and an average of 459 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 | 1326453556 |
|---|---|
| Specialty | Student in an Organized Health Care Education/Training Program |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/26/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
Avg: 83.1
Reporting: Group practice
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
276
Total Claims
$3K
Total Drug Cost
195
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 278
- Total Day Supply
- 2,265
- Generic Drug Cost
- $2K
- Opioid Claims
- 39 (14.1% rate)
- Antibiotic Claims
- 66
Patient Demographics
- Average Patient Age
- 72.0 years
- Avg HCC Risk Score
- 2.07
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 42, 65-74: 71, 75-84: 57, 85+: 25
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Marc Armstrong, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Prednisone
Prednisone
34 claims
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
23 claims
- Nitrofurantoin Mon…
Nitrofurantoin Mono-Macro
22 claims
- Methylprednisolone
Methylprednisolone
21 claims
- Ondansetron Odt
Ondansetron Odt
20 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
16 claims
- Hydrocodone-Acetam… 12
Hydrocodone-Acetaminophen
12 claims
| Drug | Claims |
|---|---|
| Prednisone | 34 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 23 |
| Nitrofurantoin Mono-Macro Nitrofurantoin Monohyd/M-Cryst | 22 |
| Methylprednisolone | 21 |
| Ondansetron Odt Ondansetron | 20 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 16 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 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 SD →
All providers in South Dakota →
Compare specialties →
Student in an Organized Health Care Education/Training Program Overview
How Marc Armstrong, M.D. 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
Marc Armstrong, M.D.'s 276 claims are below the specialty average of 459.
Nearby Student in an Organized Health Care Education/Training Program Providers in South Dakota
Other clinicians with the same primary specialty enrolled in South Dakota, drawn from the same CMS NPPES roster as Armstrong.
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 South Dakota medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Student in an Organized Health Care Education/Training Program 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 Marc Armstrong, M.D.'s specialty? ▼
Marc Armstrong, M.D. specializes in Student in an Organized Health Care Education/Training Program and practices in Aberdeen, South Dakota. Credentials: M.D..
How much does Marc Armstrong, M.D. prescribe under Medicare Part D? ▼
In 2023, Marc Armstrong, M.D. wrote 276 Medicare Part D claims totaling $3K in drug costs for 195 beneficiaries.
What is Marc Armstrong, M.D.'s Medicare quality score? ▼
Marc Armstrong, M.D. has a CMS MIPS Final Score of 75/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Marc Armstrong, M.D. located? ▼
Marc Armstrong, M.D. is located at 305 S STATE ST, Aberdeen, SD, 57401. Phone: (605) 622-5100.
What is Marc Armstrong, M.D.'s NPI number? ▼
Marc Armstrong, M.D.'s National Provider Identifier (NPI) is 1326453556, issued on 06/26/2014.
Does Marc Armstrong, M.D. prescribe opioids? ▼
Yes, Marc Armstrong, M.D. had 39 opioid claims in 2023 with an opioid prescribing rate of 14.1%.
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 Marc Armstrong, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Marc Armstrong, M.D.'s most frequently prescribed drugs include Prednisone, Oxycodone-Acetaminophen, Nitrofurantoin Mono-Macro. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marc Armstrong, M.D. accept Medicare? ▼
Marc Armstrong, M.D. appears in CMS Medicare data with 276 Part D claims and 195 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marc Armstrong, M.D.'s credentials? ▼
Marc Armstrong, M.D.'s NPI is 1326453556 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.
- 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.