NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1679563746 M.D.
Verify on CMS → Nelson Ferreira, M.D.
Gastroenterology Physician in Hagerstown, Maryland.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,601 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
487
Medicare Part D claims · 213 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$10.1K
16 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Nelson Ferreira, M.D. filed 487 Medicare Part D claims in 2023 as a Gastroenterology Physician in Hagerstown, Maryland, prescribing 84% generic.
- 487
- Part D claims, 2023
- 84%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥62nd
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1679563746 · Gastroenterology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1679563746
- ENUM-LEGACY 2005
- TAX-MID 17K Gastroenterology Physician
- RX-LIGHT 487
- BOOK-THIN 416 in Maryland
- PHOTO-ENUM Peter Nelson · 2005
Nelson Ferreira, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
487 ≥ 62nd percentile 62% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. 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 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Nelson Ferreira, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 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 Nelson Ferreira, M.D.?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
487 42% vs specialty avg
Specialty distribution in Maryland
How Gastroenterology Physician compares to other specialties among Maryland providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Gastroenterology Physician. Verify directly:
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 | 1679563746 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/28/2005 |
Hospital and facility affiliations
Facilities where Nelson Ferreira, M.D. 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.
Medical Practices OF Antietam, LLC
Hagerstown, MD
Meritus Medical Center Inc
Hagerstown, MD
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 Nelson Ferreira, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$10.1K
Largest payer
Phathom Pharmaceuticals, Inc.
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
Nelson Ferreira, M.D. - brand share 16.0%
Gastroenterology Physician average
16% brand-name claims vs 84% generic, on 487 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.
487
Total Claims
$98K
Total Drug Cost
213
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 790
- Total Day Supply
- 20,020
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $82K
- Generic Drug Cost
- $16K
- Antibiotic Claims
- 15
Patient Demographics
- Average Patient Age
- 71.6 years
- Avg HCC Risk Score
- 1.18
- 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 Nelson Ferreira, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Omeprazole
Omeprazole
79 claims
- Pantoprazole Sodium
Pantoprazole Sodium
77 claims
- Famotidine
Famotidine
72 claims
- Clenpiq
Clenpiq
46 claims
- Dicyclomine Hcl
Dicyclomine Hcl
34 claims
- Ondansetron Hcl 18
Ondansetron Hcl
18 claims
- Colestipol Hcl 15
Colestipol Hcl
15 claims
- Esomeprazole Magne… 13
Esomeprazole Magnesium
13 claims
| Drug | Claims |
|---|---|
| Omeprazole | 79 |
| Pantoprazole Sodium | 77 |
| Famotidine | 72 |
| Clenpiq Sod Picosulf/Mag Ox/Citric Ac | 46 |
| Dicyclomine Hcl | 34 |
| Ondansetron Hcl | 18 |
| Colestipol Hcl | 15 |
| Esomeprazole Magnesium | 13 |
| Gavilyte-C "Peg3350/Sod Sulf | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Nelson Ferreira, M.D. fits within the Gastroenterology Physician landscape nationally.
16,601
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Nelson Ferreira, M.D.'s 487 claims are below the specialty average of 833.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Ferreira, both outside Maryland so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gastroenterology Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Ferreira.
One of 416 Gastroenterology Physician providers enrolled in Maryland, 5 are shown here.
Dr. Maaza Abdi
M.D.
Baltimore, MD
Dr. Tsion Abdi
MD
Baltimore, MD
Dr. Hamza Abdulla
M.D.
Easton, MD
Dr. Thomas Abernathy
M.D.
Catonsville, MD
Dr. Ruben Acosta
M.D.
Silver Spring, MD
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Nelson Ferreira, M.D.'s specialty? ▼
Nelson Ferreira, M.D. specializes in Gastroenterology Physician and practices in Hagerstown, Maryland. Credentials: M.D..
How much does Nelson Ferreira, M.D. prescribe under Medicare Part D? ▼
In 2023, Nelson Ferreira, M.D. wrote 487 Medicare Part D claims totaling $98K in drug costs for 213 beneficiaries.
Where is Nelson Ferreira, M.D. located? ▼
Nelson Ferreira, M.D. is located at 11110 MEDICAL CAMPUS RD, Hagerstown, MD, 21742. Phone: (301) 665-4585.
What is Nelson Ferreira, M.D.'s NPI number? ▼
Nelson Ferreira, M.D.'s National Provider Identifier (NPI) is 1679563746, issued on 10/28/2005.
Does Nelson Ferreira, M.D. prescribe more brand-name or generic drugs? ▼
Nelson Ferreira, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $82K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,601 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 Nelson Ferreira, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Nelson Ferreira, M.D.'s most frequently prescribed drugs include Omeprazole, Pantoprazole Sodium, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Nelson Ferreira, M.D. accept Medicare? ▼
Nelson Ferreira, M.D. appears in CMS Medicare data with 487 Part D claims and 213 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Nelson Ferreira, M.D.'s credentials? ▼
Nelson Ferreira, M.D.'s NPI is 1679563746 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.
- 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.