NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1568666543 MD
Verify on CMS → Gary Reiss, MD
Gastroenterology Physician in Marrero, Louisiana. 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 · 648 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
80%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$2.6K
134 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
Gary Reiss, MD filed 2,227 Medicare Part D claims in 2023 as a Gastroenterology Physician in Marrero, Louisiana, prescribing 80% generic.
- 2K
- Part D claims, 2023
- 80%
- 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.
Gary Reiss, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
2,227 Top 15% higher than 85% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Gary Reiss, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Gary Reiss, MD?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
2,227 167% vs specialty avg
Specialty distribution in Louisiana
How Gastroenterology Physician compares to other specialties among Louisiana providers
Largest specialties in Louisiana (% of in-state 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:
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).
Gary Reiss, MD appears in the CMS NPPES registry as a Gastroenterology Physician provider holding MD credentials at 1111 MEDICAL CENTER BLVD, Marrero, LA, 70072, with a listed phone of (504) 349-6401. NPI 1568666543 was issued on 06/13/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Reiss most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.
Medicare Part D records for calendar year 2023 show 2,227 prescription claims written by this provider, covering 648 Medicare beneficiaries and totaling roughly $311K in drug spend, split 20% brand-name and 80% generic by claim count, with an opioid prescribing rate of 0.7%. These figures capture only Medicare Part D, commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.
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 | 1568666543 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/13/2007 |
Hospital and facility affiliations
Facilities where Gary Reiss, 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, Gary Reiss, MD is affiliated with 3 Medicare-billing facilities.
Crescent City Physicians Inc
New Orleans, LA
New Orleans Physician Services Inc
Marrero, LA
Texas Digestive Disease Consultants, PLLC
Metairie, LA
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 Gary Reiss, MD. Source: openpaymentsdata.cms.gov.
Total received
$2.6K
Largest payer
Laborie Medical Technologies Corp.
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
Gary Reiss, MD - brand share 20.0%
Gastroenterology Physician average
20% brand-name claims vs 80% generic, on 2,227 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.
2,227
Total Claims
$311K
Total Drug Cost
648
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,683
- Total Day Supply
- 93,918
- Brand vs Generic
- 20% brand / 80% generic
- Brand Drug Cost
- $260K
- Generic Drug Cost
- $51K
- Opioid Claims
- 16 (0.7% rate)
- Antibiotic Claims
- 70
Patient Demographics
- Average Patient Age
- 69.5 years
- Avg HCC Risk Score
- 1.46
- Gender Split
- 60% female / 40% male
- Age Distribution
- <65: 133, 65-74: 334, 75-84: 160, 85+: 21
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gary Reiss, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Omeprazole
Omeprazole
309 claims
- Pantoprazole Sodium
Pantoprazole Sodium
279 claims
- Dicyclomine Hcl
Dicyclomine Hcl
244 claims
- Clenpiq
Clenpiq
127 claims
- Linzess 118
Linzess
118 claims
- Famotidine 107
Famotidine
107 claims
- Ondansetron Odt 85
Ondansetron Odt
85 claims
- Promethazine Hcl 79
Promethazine Hcl
79 claims
| Drug | Claims |
|---|---|
| Omeprazole | 309 |
| Pantoprazole Sodium | 279 |
| Dicyclomine Hcl | 244 |
| Clenpiq Sod Picosulf/Mag Ox/Citric Ac | 127 |
| Linzess Linaclotide | 118 |
| Famotidine | 107 |
| Ondansetron Odt Ondansetron | 85 |
| Promethazine Hcl | 79 |
| Ondansetron Hcl | 59 |
| Sucralfate | 57 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Gary Reiss, 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
Gary Reiss, MD's 2,227 claims are above the specialty average of 833.
Nearby Gastroenterology Physician Providers in Louisiana
Other clinicians with the same primary specialty enrolled in Louisiana, drawn from the same CMS NPPES roster as Reiss.
Dr. Fiyinfoluwa Abraham
MD
New Orleans, LA
Dr. Stephen Abshire
MD
Lafayette, LA
Dr. Harishwar Agarwal
M.D.
Alexandria, LA
Dr. Jatinder Ahluwalia
M.D.
Lafayette, LA
Dr. Amit Ahuja
M.D.
Alexandria, LA
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 Louisiana 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 Gary Reiss, MD's specialty? ▼
Gary Reiss, MD specializes in Gastroenterology Physician and practices in Marrero, Louisiana. Credentials: MD.
How much does Gary Reiss, MD prescribe under Medicare Part D? ▼
In 2023, Gary Reiss, MD wrote 2,227 Medicare Part D claims totaling $311K in drug costs for 648 beneficiaries.
Where is Gary Reiss, MD located? ▼
Gary Reiss, MD is located at 1111 MEDICAL CENTER BLVD, Marrero, LA, 70072. Phone: (504) 349-6401.
What is Gary Reiss, MD's NPI number? ▼
Gary Reiss, MD's National Provider Identifier (NPI) is 1568666543, issued on 06/13/2007.
Does Gary Reiss, MD prescribe more brand-name or generic drugs? ▼
Gary Reiss, MD's prescribing is 20% brand-name and 80% generic drugs by claim count, with $260K in brand drug costs.
Does Gary Reiss, MD prescribe opioids? ▼
Yes, Gary Reiss, MD had 16 opioid claims in 2023 with an opioid prescribing rate of 0.7%.
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 Gary Reiss, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gary Reiss, MD's most frequently prescribed drugs include Omeprazole, Pantoprazole Sodium, Dicyclomine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gary Reiss, MD accept Medicare? ▼
Gary Reiss, MD appears in CMS Medicare data with 2,227 Part D claims and 648 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gary Reiss, MD's credentials? ▼
Gary Reiss, MD's NPI is 1568666543 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
- 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
Compiled from official public sources by the PlainDoctor editorial team.