NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1548344583 M.D.
Verify on CMS → Mark Detweiler, M.D.
Gastroenterology Physician in Londonderry, New Hampshire.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 17,061 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
128
Medicare Part D claims · 28 beneficiaries · Gastroenterology Physician avg: 848
What the federal data shows
Mark Detweiler, M.D. filed 128 Medicare Part D claims in 2024 as a Gastroenterology Physician in Londonderry, New Hampshire.
- 128
- Part D claims, 2024
- ≥34th
- 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.
Federal trust snapshot
What official records show about Mark Detweiler, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1548344583), first enumerated 10/25/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 128 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1548344583 · Gastroenterology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1548344583
- ENUM-LEGACY 2006
- TAX-MID 17K Gastroenterology Physician
- RX-LIGHT 128
- BOOK-THIN 93 in New Hampshire
- PHOTO-ENUM Robert Myers, MD · 2006
Mark Detweiler, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
128 ≥ 34th percentile 34% of 1,416,883 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 · 2024
◑
Board-eligible specialty (heuristic, not verified)
Mark Detweiler, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Detweiler, M.D.?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
128 85% vs specialty avg
Specialty distribution in New Hampshire
How Gastroenterology Physician compares to other specialties among New Hampshire 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 | 1548344583 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/25/2006 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
128
Total Claims
$20K
Total Drug Cost
28
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 202
- Total Day Supply
- 5,683
- Generic Drug Cost
- $10K
- Opioid Claims
- 21 (16.4% rate)
- Antibiotic Claims
- 12
Patient Demographics
- Average Patient Age
- 69.4 years
- Avg HCC Risk Score
- 1.17
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Mark Detweiler, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Nystatin
Nystatin
18 claims
- Oxycodone Hcl
Oxycodone Hcl
17 claims
- Famotidine
Famotidine
13 claims
| Drug | Claims |
|---|---|
| Nystatin | 18 |
| Oxycodone Hcl | 17 |
| Famotidine | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Mark Detweiler, M.D. fits within the Gastroenterology Physician landscape nationally.
17,061
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
848
Avg Claims per Provider
Mark Detweiler, M.D.'s 128 claims are below the specialty average of 848.
Nationwide Gastroenterology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Detweiler, both outside New Hampshire so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Gastroenterology Physician Providers in New Hampshire
Other clinicians with the same primary specialty enrolled in New Hampshire, drawn from the same CMS NPPES roster as Detweiler.
One of 93 Gastroenterology Physician providers enrolled in New Hampshire, 5 are shown here.
Dr. Alain Ades
M.D.
Stratham, NH
Dr. Jeffrey Adler
M.D.
Lebanon, NH
Dr. Vincent Aguirre
M.D., PH.D.
Manchester, NH
Dr. Peter Anderson
M.D.
Lebanon, NH
Dr. John Baier
MD
Concord, NH
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mark Detweiler, M.D.'s specialty? ▼
Mark Detweiler, M.D. specializes in Gastroenterology Physician and practices in Londonderry, New Hampshire. Credentials: M.D..
How much does Mark Detweiler, M.D. prescribe under Medicare Part D? ▼
In 2024, Mark Detweiler, M.D. wrote 128 Medicare Part D claims totaling $20K in drug costs for 28 beneficiaries.
Where is Mark Detweiler, M.D. located? ▼
Mark Detweiler, M.D. is located at 1B COMMONS DR, Londonderry, NH, 03053. Phone: (603) 818-4712.
What is Mark Detweiler, M.D.'s NPI number? ▼
Mark Detweiler, M.D.'s National Provider Identifier (NPI) is 1548344583, issued on 10/25/2006.
Does Mark Detweiler, M.D. prescribe opioids? ▼
Yes, Mark Detweiler, M.D. had 21 opioid claims in 2024 with an opioid prescribing rate of 16.4%.
How many Gastroenterology Physician providers are there in the US? ▼
There are 17,061 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 848 Medicare Part D claims per year.
What drugs does Mark Detweiler, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Mark Detweiler, M.D.'s most frequently prescribed drugs include Nystatin, Oxycodone Hcl, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Detweiler, M.D. accept Medicare? ▼
Mark Detweiler, M.D. appears in CMS Medicare data with 128 Part D claims and 28 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Detweiler, M.D.'s credentials? ▼
Mark Detweiler, M.D.'s NPI is 1548344583 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.