NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1083762181 M.D.
Verify on CMS → Charles De Sieyes, M.D.
Family Medicine Physician in Falmouth, Maine.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 147,640 in Family Medicine 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
17
Medicare Part D claims · Family Medicine Physician avg: 3K
Generic prescribing
0%
generic claims · 65% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Charles De Sieyes, M.D. filed 17 Medicare Part D claims in 2023 as a Family Medicine Physician in Falmouth, Maine, prescribing 0% generic.
- 17
- Part D claims, 2023
- 0%
- generic prescribing
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.
Charles De Sieyes, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
17 0th percentile higher than 0% 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-eligible specialty (heuristic, not verified)
Charles De Sieyes, 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 Charles De Sieyes, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
17 100% vs specialty avg
Specialty distribution in Maine
How Family Medicine Physician compares to other specialties among Maine 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 Family Medicine 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).
Charles De Sieyes, M.D. appears in the CMS NPPES registry as a Family Medicine Physician provider holding M.D. credentials at 202 US ROUTE 1, Falmouth, ME, 04105, with a listed phone of (207) 781-4488. NPI 1083762181 was issued on 01/08/2007.
Medicare Part D records for calendar year 2023 show 17 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $4K in drug spend, split 65% brand-name and 0% generic by claim count.
Family Medicine Physician is a high-volume specialty nationwide, with 147,640 enrolled providers across 56 states and an average of 3,418 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 | 1083762181 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 01/08/2007 |
Brand vs generic prescribing mix · Brand-heavy
Charles De Sieyes, M.D. - brand share 65.0%
Family Medicine Physician average
65% brand-name claims vs 0% generic, on 17 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.
17
Total Claims
$4K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 22
- Total Day Supply
- 531
- Brand vs Generic
- 65% brand / 0% generic
- Brand Drug Cost
- $4K
Patient Demographics
- Average Patient Age
- 72.7 years
- Avg HCC Risk Score
- 0.60
Family Medicine Physician Overview
How Charles De Sieyes, M.D. fits within the Family Medicine Physician landscape nationally.
147,640
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Charles De Sieyes, M.D.'s 17 claims are below the specialty average of 3,418.
Nearby Family Medicine Physician Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as De Sieyes.
Dr. Jeffrey Aalberg
MD
Falmouth, ME
Dr. Elizabeth Abbas
DO
Farmington, ME
Dr. Robert Abrams
M.D.
Lubec, ME
Dr. Andrea Abrell
DO
Augusta, ME
Dr. Katie Adams
MD
Lincoln, ME
Compare Family Medicine 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 Maine medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Family Medicine 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.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Maine
Frequently Asked Questions
What is Charles De Sieyes, M.D.'s specialty? ▼
Charles De Sieyes, M.D. specializes in Family Medicine Physician and practices in Falmouth, Maine. Credentials: M.D..
How much does Charles De Sieyes, M.D. prescribe under Medicare Part D? ▼
In 2023, Charles De Sieyes, M.D. wrote 17 Medicare Part D claims totaling $4K in drug costs for N/A beneficiaries.
Where is Charles De Sieyes, M.D. located? ▼
Charles De Sieyes, M.D. is located at 202 US ROUTE 1, Falmouth, ME, 04105. Phone: (207) 781-4488.
What is Charles De Sieyes, M.D.'s NPI number? ▼
Charles De Sieyes, M.D.'s National Provider Identifier (NPI) is 1083762181, issued on 01/08/2007.
Does Charles De Sieyes, M.D. prescribe more brand-name or generic drugs? ▼
Charles De Sieyes, M.D.'s prescribing is 65% brand-name and 0% generic drugs by claim count, with $4K in brand drug costs.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,640 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
Does Charles De Sieyes, M.D. accept Medicare? ▼
Charles De Sieyes, M.D. appears in CMS Medicare data with 17 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles De Sieyes, M.D.'s credentials? ▼
Charles De Sieyes, M.D.'s NPI is 1083762181 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
Compiled from official public sources by the PlainDoctor editorial team.