NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1235108580 MD
Verify on CMS → Mark Eggena, MD
Internal Medicine Physician in Rockport, 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 172,858 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
299
Medicare Part D claims · 81 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
66%
generic claims · 34% 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
Mark Eggena, MD filed 299 Medicare Part D claims in 2023 as a Internal Medicine Physician in Rockport, Maine, prescribing 66% generic.
- 299
- Part D claims, 2023
- 66%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Mark Eggena, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
299 49th percentile higher than 49% 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 certification likely (heuristic, not verified)
Mark Eggena, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mark Eggena, MD?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
299 89% vs specialty avg
Specialty distribution in Maine
How Internal 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 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).
Mark Eggena, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 4 GLEN COVE DR, Rockport, ME, 04856, with a listed phone of (207) 593-5800. NPI 1235108580 was issued on 03/17/2006.
Medicare Part D records for calendar year 2023 show 299 prescription claims written by this provider, covering 81 Medicare beneficiaries and totaling roughly $282K in drug spend, split 34% brand-name and 66% generic by claim count.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 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 | 1235108580 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 03/17/2006 |
Hospital and facility affiliations
Facilities where Mark Eggena, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Mainehealth
Portland, ME
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Above average
Mark Eggena, MD - brand share 34.0%
Internal Medicine Physician average
34% brand-name claims vs 66% generic, on 299 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.
299
Total Claims
$282K
Total Drug Cost
81
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 635
- Total Day Supply
- 18,736
- Brand vs Generic
- 34% brand / 66% generic
- Brand Drug Cost
- $259K
- Generic Drug Cost
- $22K
- Antibiotic Claims
- 36
Patient Demographics
- Average Patient Age
- 73.4 years
- Avg HCC Risk Score
- 1.54
- Gender Split
- 36% female / 64% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mark Eggena, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
27 claims
- Descovy
Descovy
20 claims
- Pifeltro
Pifeltro
20 claims
- Rifampin
Rifampin
14 claims
- Dovato
Dovato
12 claims
- Genvoya
Genvoya
11 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 27 |
| Descovy Emtricitabine/Tenofov Alafenam | 20 |
| Pifeltro Doravirine | 20 |
| Rifampin | 14 |
| Dovato Dolutegravir Sodium/Lamivudine | 12 |
| Genvoya Elviteg/Cob/Emtri/Tenof Alafen | 11 |
* 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 Mark Eggena, MD fits within the Internal Medicine Physician landscape nationally.
172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Mark Eggena, MD's 299 claims are below the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Maine
Other clinicians with the same primary specialty enrolled in Maine, drawn from the same CMS NPPES roster as Eggena.
Dr. Christopher Abbott
D.O.
Lewiston, ME
Dr. Karen Abernathy
M.D.
Rockport, ME
Dr. Hassan Abouleish
MD
Houlton, ME
Dr. Philip Abraham
M.D.
Kittery, ME
Dr. Alexander Abud
MD
Rockport, ME
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 Maine 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.
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Frequently Asked Questions
What is Mark Eggena, MD's specialty? ▼
Mark Eggena, MD specializes in Internal Medicine Physician and practices in Rockport, Maine. Credentials: MD.
How much does Mark Eggena, MD prescribe under Medicare Part D? ▼
In 2023, Mark Eggena, MD wrote 299 Medicare Part D claims totaling $282K in drug costs for 81 beneficiaries.
Where is Mark Eggena, MD located? ▼
Mark Eggena, MD is located at 4 GLEN COVE DR, Rockport, ME, 04856. Phone: (207) 593-5800.
What is Mark Eggena, MD's NPI number? ▼
Mark Eggena, MD's National Provider Identifier (NPI) is 1235108580, issued on 03/17/2006.
Does Mark Eggena, MD prescribe more brand-name or generic drugs? ▼
Mark Eggena, MD's prescribing is 34% brand-name and 66% generic drugs by claim count, with $259K in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,858 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 Mark Eggena, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Mark Eggena, MD's most frequently prescribed drugs include Atorvastatin Calcium, Descovy, Pifeltro. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mark Eggena, MD accept Medicare? ▼
Mark Eggena, MD appears in CMS Medicare data with 299 Part D claims and 81 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Eggena, MD's credentials? ▼
Mark Eggena, MD's NPI is 1235108580 with credentials MD. 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.