NPI registry status
Active
2026 NPPES data Dentist NPI 1477046571 DMD
Verify on CMS → Christopher Castonguay, DMD
Dentist in Millinocket, 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 93,793 in Dentist, 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
99
Medicare Part D claims · 70 beneficiaries · Dentist avg: 87
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Christopher Castonguay, DMD filed 99 Medicare Part D claims in 2023 as a Dentist in Millinocket, Maine.
- 99
- Part D claims, 2023
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.
Christopher Castonguay, DMD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
99 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
What does the federal data show about Christopher Castonguay, DMD?
Quality data not reportedPrimary specialty
Dentist
Medicare Part D claims
99 14% vs specialty avg
Specialty distribution in Maine
How Dentist 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 Dentist. 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).
Christopher Castonguay, DMD appears in the CMS NPPES registry as a Dentist provider holding DMD credentials at 50 SUMMER ST, Millinocket, ME, 04462, with a listed phone of (207) 528-2285. NPI 1477046571 was issued on 06/13/2018.
Medicare Part D records for calendar year 2023 show 99 prescription claims written by this provider, covering 70 Medicare beneficiaries and totaling roughly $502 in drug spend.
Dentist is a high-volume specialty nationwide, with 93,793 enrolled providers across 56 states and an average of 87 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 | 1477046571 |
|---|---|
| Specialty | Dentist |
| Credentials | DMD |
| Gender | Male |
| NPI Issued | 06/13/2018 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
99
Total Claims
$502
Total Drug Cost
70
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 99
- Total Day Supply
- 909
- Generic Drug Cost
- $487
- Antibiotic Claims
- 78
Patient Demographics
- Average Patient Age
- 66.5 years
- Avg HCC Risk Score
- 1.17
- Gender Split
- 56% female / 44% male
- Age Distribution
- <65: 29, 65-74: N/A, 75-84: 18, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Christopher Castonguay, DMD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Amoxicillin
Amoxicillin
62 claims
- Chlorhexidine Gluc… 16
Chlorhexidine Gluconate
16 claims
- Clindamycin Hcl 12
Clindamycin Hcl
12 claims
| Drug | Claims |
|---|---|
| Amoxicillin | 62 |
| Chlorhexidine Gluconate | 16 |
| Clindamycin Hcl | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Dentist Overview
How Christopher Castonguay, DMD fits within the Dentist landscape nationally.
93,793
Dentist Providers in US
56
States with Dentist
87
Avg Claims per Provider
Christopher Castonguay, DMD's 99 claims are above the specialty average of 87.
Nearby Dentist Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as Castonguay.
Dr. Morgan Abdul-Korah
DMD
Patten, ME
Dr. Albert Abena
D.D.S.
Portland, ME
Dr. Stephanie Aboody-Isufaj
DMD
Topsham, ME
Dr. Israel Adeloye
D.M.D
Bangor, ME
Dr. Toyosi Adeyemo
DMD
Bangor, ME
Compare Dentist 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 Dentist 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
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
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 Christopher Castonguay, DMD's specialty? ▼
Christopher Castonguay, DMD specializes in Dentist and practices in Millinocket, Maine. Credentials: DMD.
How much does Christopher Castonguay, DMD prescribe under Medicare Part D? ▼
In 2023, Christopher Castonguay, DMD wrote 99 Medicare Part D claims totaling $502 in drug costs for 70 beneficiaries.
Where is Christopher Castonguay, DMD located? ▼
Christopher Castonguay, DMD is located at 50 SUMMER ST, Millinocket, ME, 04462. Phone: (207) 528-2285.
What is Christopher Castonguay, DMD's NPI number? ▼
Christopher Castonguay, DMD's National Provider Identifier (NPI) is 1477046571, issued on 06/13/2018.
How many Dentist providers are there in the US? ▼
There are 93,793 Dentist providers across 56 states in the US. The average Dentist provider writes 87 Medicare Part D claims per year.
What drugs does Christopher Castonguay, DMD prescribe most often? ▼
Based on 2023 Medicare Part D data, Christopher Castonguay, DMD's most frequently prescribed drugs include Amoxicillin, Chlorhexidine Gluconate, Clindamycin Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Christopher Castonguay, DMD accept Medicare? ▼
Christopher Castonguay, DMD appears in CMS Medicare data with 99 Part D claims and 70 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Christopher Castonguay, DMD's credentials? ▼
Christopher Castonguay, DMD's NPI is 1477046571 with credentials DMD. 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.
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.