NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1346278108 MD
Verify on CMS → Mark Harrison, MD
Infectious Disease Physician in Saint Joseph, Michigan.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 8,314 in Infectious Disease 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
185
Medicare Part D claims · 63 beneficiaries · Infectious Disease Physician avg: 816
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.1 · Exceptional
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Mark Harrison, MD reported a CMS MIPS final score of 100/100 - above the 83.1 national average - and filed 185 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 185
- Part D claims, 2023
- 81%
- 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.
Mark Harrison, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
100 Top 7% higher than 93% 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 Mark Harrison, MD sits
This provider among infectious disease physician peers
Across the 2,276 infectious disease physician providers who report both Medicare Part D prescribing and a MIPS quality score, Mark Harrison, MD writes more Part D claims than 29% of them and scores higher on MIPS quality than 91% - placing this provider in the lower-volume, high-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 infectious disease physician peer from a representative sample of 60; the gold marker is Mark Harrison, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Mark Harrison, 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 Mark Harrison, MD?
High performer (top quartile)Primary specialty
Infectious Disease Physician
Medicare Part D claims
185 77% vs specialty avg
MIPS final score
100/100 16.9 pts vs avg
Specialty distribution in Michigan
How Infectious Disease Physician compares to other specialties among Michigan providers
Medicare quality performance, MIPS
Mark Harrison, MD's 2023 MIPS final score plotted against the Infectious Disease Physician national average
- MIPS Final Score
- 100/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Infectious Disease Physician) - 100/100 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).
Mark Harrison, MD appears in the CMS NPPES registry as an Infectious Disease Physician provider holding MD credentials at 1234 NAPIER AVE, Saint Joseph, MI, 49085, with a listed phone of (269) 471-1700. NPI 1346278108 was issued on 06/29/2006.
Medicare Part D records for calendar year 2023 show 185 prescription claims written by this provider, covering 63 Medicare beneficiaries and totaling roughly $14K in drug spend, split 19% brand-name and 81% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year (Quality 87.5), compared with the national average of 83.1.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,314 enrolled providers across 54 states and an average of 816 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 | 1346278108 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/29/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Avg: 83.1
87.5432
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
License & disciplinary context - Michigan MI-BOM 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~41K Michigan medical licensees in 2023 - they are NOT specific to Mark Harrison, MD. To verify Mark Harrison, MD's current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases
MI-BOM publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Mark Harrison, MD - brand share 19.0%
Infectious Disease Physician average
19% brand-name claims vs 81% generic, on 185 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.
185
Total Claims
$14K
Total Drug Cost
63
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 265
- Total Day Supply
- 6,870
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $11K
- Generic Drug Cost
- $3K
- Antibiotic Claims
- 23
Patient Demographics
- Average Patient Age
- 71.3 years
- Avg HCC Risk Score
- 2.54
- Gender Split
- 52% female / 48% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Harrison, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Spironolactone
Spironolactone
15 claims
- Metoprolol Tartrate
Metoprolol Tartrate
11 claims
- Prednisone
Prednisone
11 claims
| Drug | Claims |
|---|---|
| Spironolactone | 15 |
| Metoprolol Tartrate | 11 |
| Prednisone | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How Mark Harrison, MD fits within the Infectious Disease Physician landscape nationally.
8,314
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
816
Avg Claims per Provider
Mark Harrison, MD's 185 claims are below the specialty average of 816.
Nearby Infectious Disease Physician Providers in Michigan
Other clinicians with the same primary specialty enrolled in Michigan, drawn from the same CMS NPPES roster as Harrison.
Dr. Mujahed Abbas
M.D.
Lansing, MI
Dr. Rasha Abdalla
MD
Detroit, MI
Dr. Hend Abdul-Jauwad
MB, BCH, BAO
Plymouth, MI
Dr. Elfatih Abter
MD
Lapeer, MI
Dr. Fadi Abu Yasin
MD
Canton, MI
Compare Infectious Disease 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 Michigan medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Infectious Disease 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 Mark Harrison, MD's specialty? ▼
Mark Harrison, MD specializes in Infectious Disease Physician and practices in Saint Joseph, Michigan. Credentials: MD.
How much does Mark Harrison, MD prescribe under Medicare Part D? ▼
In 2023, Mark Harrison, MD wrote 185 Medicare Part D claims totaling $14K in drug costs for 63 beneficiaries.
What is Mark Harrison, MD's Medicare quality score? ▼
Mark Harrison, MD has a CMS MIPS Final Score of 100/100 (Quality: 87.5). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Mark Harrison, MD located? ▼
Mark Harrison, MD is located at 1234 NAPIER AVE, Saint Joseph, MI, 49085. Phone: (269) 471-1700.
What is Mark Harrison, MD's NPI number? ▼
Mark Harrison, MD's National Provider Identifier (NPI) is 1346278108, issued on 06/29/2006.
Does Mark Harrison, MD prescribe more brand-name or generic drugs? ▼
Mark Harrison, MD's prescribing is 19% brand-name and 81% generic drugs by claim count, with $11K in brand drug costs.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,314 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 816 Medicare Part D claims per year.
What drugs does Mark Harrison, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Harrison, MD's most frequently prescribed drugs include Spironolactone, Metoprolol Tartrate, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Harrison, MD accept Medicare? ▼
Mark Harrison, MD appears in CMS Medicare data with 185 Part D claims and 63 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Harrison, MD's credentials? ▼
Mark Harrison, MD's NPI is 1346278108 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
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.