NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1053571620 MD
Verify on CMS → Marcum Gillis, MD
Gastroenterology Physician in Winston Salem, North Carolina.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,567 in Gastroenterology 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
2K
Medicare Part D claims · 535 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
86%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
86.5/100
▲ 3 pts above national avg 83.1 · Above neutral
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
Marcum Gillis, MD reported a CMS MIPS final score of 86.5/100 - above the 83.1 national average - and filed 2,251 Medicare Part D claims in 2023.
- 86.5/100
- MIPS score · +3 vs avg
- 2K
- Part D claims, 2023
- 86%
- 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.
Marcum Gillis, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
87 Top 48% higher than 52% 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 Marcum Gillis, MD sits
This provider among gastroenterology physician peers
Across the 5,957 gastroenterology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Marcum Gillis, MD writes more Part D claims than 93% of them and scores higher on MIPS quality than 57% - placing this provider in the high-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 gastroenterology physician peer from a representative sample of 60; the gold marker is Marcum Gillis, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Marcum Gillis, MD 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 Marcum Gillis, MD?
High performer (top quartile)Primary specialty
Gastroenterology Physician
Medicare Part D claims
2,251 170% vs specialty avg
MIPS final score
86.5/100 3.4 pts vs avg
Specialty distribution in North Carolina
How Gastroenterology Physician compares to other specialties among North Carolina providers
Medicare quality performance, MIPS
Marcum Gillis, MD's 2023 MIPS final score plotted against the Gastroenterology Physician national average
- MIPS Final Score
- 86.5/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Gastroenterology Physician) - 86.5/100 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).
Marcum Gillis, MD appears in the CMS NPPES registry as a Gastroenterology Physician provider holding MD credentials at 195 KIMEL PARK DR STE 200, Winston Salem, NC, 27103, with a listed phone of (336) 768-6211. NPI 1053571620 was issued on 06/16/2008.
Medicare Part D records for calendar year 2023 show 2,251 prescription claims written by this provider, covering 535 Medicare beneficiaries and totaling roughly $429K in drug spend, split 14% brand-name and 86% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 86.5/100 for the 2023 performance year (Quality 87.6, Cost 67.4), compared with the national average of 83.1.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,567 enrolled providers across 54 states and an average of 833 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 | 1053571620 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/16/2008 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
86.4863
Final Score
Avg: 83.1
87.5805
Quality
67.3737
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Marcum Gillis, 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.
Digestive Health Specialists PA
Winston Salem, NC
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 · Typical
Marcum Gillis, MD - brand share 14.0%
Gastroenterology Physician average
14% brand-name claims vs 86% generic, on 2,251 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.
2,251
Total Claims
$429K
Total Drug Cost
535
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,262
- Total Day Supply
- 124,043
- Brand vs Generic
- 14% brand / 86% generic
- Brand Drug Cost
- $358K
- Generic Drug Cost
- $71K
- Antibiotic Claims
- 54
Patient Demographics
- Average Patient Age
- 70.1 years
- Avg HCC Risk Score
- 1.49
- Gender Split
- 65% female / 35% male
- Age Distribution
- <65: 112, 65-74: 239, 75-84: 148, 85+: 36
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Marcum Gillis, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Pantoprazole Sodium
Pantoprazole Sodium
787 claims
- Omeprazole 260
Omeprazole
260 claims
- Dicyclomine Hcl 112
Dicyclomine Hcl
112 claims
- Linzess 104
Linzess
104 claims
- Famotidine 93
Famotidine
93 claims
- Sucralfate 81
Sucralfate
81 claims
- Nortriptyline Hcl 69
Nortriptyline Hcl
69 claims
- Colestipol Hcl 54
Colestipol Hcl
54 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 787 |
| Omeprazole | 260 |
| Dicyclomine Hcl | 112 |
| Linzess Linaclotide | 104 |
| Famotidine | 93 |
| Sucralfate | 81 |
| Nortriptyline Hcl | 69 |
| Colestipol Hcl | 54 |
| Esomeprazole Magnesium | 50 |
| Lubiprostone | 42 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Marcum Gillis, MD fits within the Gastroenterology Physician landscape nationally.
16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Marcum Gillis, MD's 2,251 claims are above the specialty average of 833.
Nearby Gastroenterology Physician Providers in North Carolina
Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as Gillis.
Dr. Manal Abdelmalek
MD
Durham, NC
Dr. Sonia Abichandani
M.D.
Cary, NC
Dr. Sabeen Abid
M.D
Greenville, NC
Dr. Kendral Adkisson
MD
Asheville, NC
Dr. Vipul Aggarwal
M.D.
Winston Salem, NC
Compare Gastroenterology 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 Carolina medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gastroenterology 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 Marcum Gillis, MD's specialty? ▼
Marcum Gillis, MD specializes in Gastroenterology Physician and practices in Winston Salem, North Carolina. Credentials: MD.
How much does Marcum Gillis, MD prescribe under Medicare Part D? ▼
In 2023, Marcum Gillis, MD wrote 2,251 Medicare Part D claims totaling $429K in drug costs for 535 beneficiaries.
What is Marcum Gillis, MD's Medicare quality score? ▼
Marcum Gillis, MD has a CMS MIPS Final Score of 86.5/100 (Quality: 87.6, Cost: 67.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Marcum Gillis, MD located? ▼
Marcum Gillis, MD is located at 195 KIMEL PARK DR STE 200, Winston Salem, NC, 27103. Phone: (336) 768-6211.
What is Marcum Gillis, MD's NPI number? ▼
Marcum Gillis, MD's National Provider Identifier (NPI) is 1053571620, issued on 06/16/2008.
Does Marcum Gillis, MD prescribe more brand-name or generic drugs? ▼
Marcum Gillis, MD's prescribing is 14% brand-name and 86% generic drugs by claim count, with $358K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,567 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Marcum Gillis, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Marcum Gillis, MD's most frequently prescribed drugs include Pantoprazole Sodium, Omeprazole, Dicyclomine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Marcum Gillis, MD accept Medicare? ▼
Marcum Gillis, MD appears in CMS Medicare data with 2,251 Part D claims and 535 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Marcum Gillis, MD's credentials? ▼
Marcum Gillis, MD's NPI is 1053571620 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.