NPI registry status
Active
2026 NPPES data Registered Dietitian NPI 1770508632 ND,RD,LD,CDE
Verify on CMS → Bert Mathieson, ND,RD,LD,CDE
Registered Dietitian in Bedford, 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 64,580 in Registered Dietitian, 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
41
Medicare Part D claims · Registered Dietitian avg: 696
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Bert Mathieson, ND,RD,LD,CDE filed 41 Medicare Part D claims in 2023 as a Registered Dietitian in Bedford, New Hampshire.
- 41
- 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.
Bert Mathieson, ND,RD,LD,CDE's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
41 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 Bert Mathieson, ND,RD,LD,CDE?
Quality data not reportedPrimary specialty
Registered Dietitian
Medicare Part D claims
41 94% vs specialty avg
Specialty distribution in New Hampshire
How Registered Dietitian 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 Registered Dietitian. 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).
Bert Mathieson, ND,RD,LD,CDE appears in the CMS NPPES registry as a Registered Dietitian provider holding ND,RD,LD,CDE credentials at 304 RIVERWAY PL, Bedford, NH, 03110, with a listed phone of (603) 623-6800. NPI 1770508632 was issued on 07/13/2006.
Medicare Part D records for calendar year 2023 show 41 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $438 in drug spend.
Registered Dietitian is a high-volume specialty nationwide, with 64,580 enrolled providers across 55 states and an average of 696 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 | 1770508632 |
|---|---|
| Specialty | Registered Dietitian |
| Credentials | ND,RD,LD,CDE |
| Gender | Male |
| NPI Issued | 07/13/2006 |
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
41
Total Claims
$438
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 51
- Total Day Supply
- 1,449
- Generic Drug Cost
- $427
Patient Demographics
- Average Patient Age
- 69.3 years
- Avg HCC Risk Score
- 0.61
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Registered Dietitian Overview
How Bert Mathieson, ND,RD,LD,CDE fits within the Registered Dietitian landscape nationally.
64,580
Registered Dietitian Providers in US
55
States with Registered Dietitian
696
Avg Claims per Provider
Bert Mathieson, ND,RD,LD,CDE's 41 claims are below the specialty average of 696.
Nearby Registered Dietitian Providers in New Hampshire
Other clinicians with the same primary specialty enrolled in New Hampshire, drawn from the same CMS NPPES roster as Mathieson.
Dr. Brittany Abbott
RD, LD
New London, NH
Valentina Accardo
Hanover, NH
Dr. Sarah Agnoli
RD
Woodsville, NH
Dr. Rima Al-Nimr
RD/RDN, LD
Lebanon, NH
Dr. Jessica Aleba
RD, LDN
Bedford, NH
Compare Registered Dietitian 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 New Hampshire medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Registered Dietitian 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
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How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore New Hampshire
Frequently Asked Questions
What is Bert Mathieson, ND,RD,LD,CDE's specialty? ▼
Bert Mathieson, ND,RD,LD,CDE specializes in Registered Dietitian and practices in Bedford, New Hampshire. Credentials: ND,RD,LD,CDE.
How much does Bert Mathieson, ND,RD,LD,CDE prescribe under Medicare Part D? ▼
In 2023, Bert Mathieson, ND,RD,LD,CDE wrote 41 Medicare Part D claims totaling $438 in drug costs for N/A beneficiaries.
Where is Bert Mathieson, ND,RD,LD,CDE located? ▼
Bert Mathieson, ND,RD,LD,CDE is located at 304 RIVERWAY PL, Bedford, NH, 03110. Phone: (603) 623-6800.
What is Bert Mathieson, ND,RD,LD,CDE's NPI number? ▼
Bert Mathieson, ND,RD,LD,CDE's National Provider Identifier (NPI) is 1770508632, issued on 07/13/2006.
How many Registered Dietitian providers are there in the US? ▼
There are 64,580 Registered Dietitian providers across 55 states in the US. The average Registered Dietitian provider writes 696 Medicare Part D claims per year.
What drugs does Bert Mathieson, ND,RD,LD,CDE prescribe most often? ▼
Based on 2023 Medicare Part D data, Bert Mathieson, ND,RD,LD,CDE's most frequently prescribed drugs include Levothyroxine Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Bert Mathieson, ND,RD,LD,CDE accept Medicare? ▼
Bert Mathieson, ND,RD,LD,CDE appears in CMS Medicare data with 41 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 Bert Mathieson, ND,RD,LD,CDE's credentials? ▼
Bert Mathieson, ND,RD,LD,CDE's NPI is 1770508632 with credentials ND,RD,LD,CDE. 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.