NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1649236084 DO
Verify on CMS → Mary Demers, DO
Internal Medicine Physician in Anchorage, Alaska.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 in Internal 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
4K
Medicare Part D claims · 161 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
85%
generic claims · 15% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$272.5
13 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
Mary Demers, DO filed 3,964 Medicare Part D claims in 2023 as a Internal Medicine Physician in Anchorage, Alaska, prescribing 85% generic.
- 4K
- Part D claims, 2023
- 85%
- generic prescribing
- $272.5
- industry payments (Sunshine Act)
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.
Mary Demers, DO's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
3,964 Top 9% higher than 91% 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
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Board-eligible specialty (heuristic, not verified)
Mary Demers, DO 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 Mary Demers, DO?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
3,964 46% vs specialty avg
Specialty distribution in Alaska
How Internal Medicine Physician compares to other specialties among Alaska 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 Internal 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).
Mary Demers, DO appears in the CMS NPPES registry as an Internal Medicine Physician provider holding DO credentials at 3340 PROVIDENCE DR, Anchorage, AK, 99508, with a listed phone of (907) 263-2200. NPI 1649236084 was issued on 04/25/2006.
Medicare Part D records for calendar year 2023 show 3,964 prescription claims written by this provider, covering 161 Medicare beneficiaries and totaling roughly $636K in drug spend, split 15% brand-name and 85% generic by claim count, with an opioid prescribing rate of 2.2%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1649236084 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | DO |
| Gender | Female |
| NPI Issued | 04/25/2006 |
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 Mary Demers, DO. Source: openpaymentsdata.cms.gov.
Total received
$273
Largest payer
AstraZeneca Pharmaceuticals LP
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
Mary Demers, DO - brand share 15.0%
Internal Medicine Physician average
15% brand-name claims vs 85% generic, on 3,964 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.
3,964
Total Claims
$636K
Total Drug Cost
161
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,401
- Total Day Supply
- 232,390
- Brand vs Generic
- 15% brand / 85% generic
- Brand Drug Cost
- $538K
- Generic Drug Cost
- $97K
- Opioid Claims
- 88 (2.2% rate)
- Antibiotic Claims
- 41
Patient Demographics
- Average Patient Age
- 72.5 years
- Avg HCC Risk Score
- 0.88
- Gender Split
- 68% female / 32% male
- Age Distribution
- <65: 12, 65-74: 92, 75-84: 41, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mary Demers, DO prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
312 claims
- Levothyroxine Sodium
Levothyroxine Sodium
186 claims
- Amlodipine Besylate
Amlodipine Besylate
155 claims
- Lisinopril
Lisinopril
144 claims
- Potassium Chloride
Potassium Chloride
132 claims
- Metoprolol Succinate 114
Metoprolol Succinate
114 claims
- Losartan Potassium 109
Losartan Potassium
109 claims
- Furosemide 106
Furosemide
106 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 312 |
| Levothyroxine Sodium | 186 |
| Amlodipine Besylate | 155 |
| Lisinopril | 144 |
| Potassium Chloride | 132 |
| Metoprolol Succinate | 114 |
| Losartan Potassium | 109 |
| Furosemide | 106 |
| Metformin Hcl Er Metformin Hcl | 94 |
| Hydrochlorothiazide | 83 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Mary Demers, DO fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Mary Demers, DO's 3,964 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Alaska
Other clinicians with the same primary specialty enrolled in Alaska, drawn from the same CMS NPPES roster as Demers.
Dr. Paul 'Worrell
MD
Anchorage, AK
Dr. Kava Afu
MD
Jber, AK
Dr. Michael Arnett
MD
Fort Wainwright, AK
Dr. April Arseneau
MD
Palmer, AK
Dr. Keith Augustin
D.O.
Anchorage, AK
Compare Internal 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 Alaska medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal 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 Alaska
Frequently Asked Questions
What is Mary Demers, DO's specialty? ▼
Mary Demers, DO specializes in Internal Medicine Physician and practices in Anchorage, Alaska. Credentials: DO.
How much does Mary Demers, DO prescribe under Medicare Part D? ▼
In 2023, Mary Demers, DO wrote 3,964 Medicare Part D claims totaling $636K in drug costs for 161 beneficiaries.
Where is Mary Demers, DO located? ▼
Mary Demers, DO is located at 3340 PROVIDENCE DR, Anchorage, AK, 99508. Phone: (907) 263-2200.
What is Mary Demers, DO's NPI number? ▼
Mary Demers, DO's National Provider Identifier (NPI) is 1649236084, issued on 04/25/2006.
Does Mary Demers, DO prescribe more brand-name or generic drugs? ▼
Mary Demers, DO's prescribing is 15% brand-name and 85% generic drugs by claim count, with $538K in brand drug costs.
Does Mary Demers, DO prescribe opioids? ▼
Yes, Mary Demers, DO had 88 opioid claims in 2023 with an opioid prescribing rate of 2.2%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Mary Demers, DO prescribe most often? ▼
Based on 2023 Medicare Part D data, Mary Demers, DO's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mary Demers, DO accept Medicare? ▼
Mary Demers, DO appears in CMS Medicare data with 3,964 Part D claims and 161 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mary Demers, DO's credentials? ▼
Mary Demers, DO's NPI is 1649236084 with credentials DO. 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.