NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1912981929 M.D.
Verify on CMS → James Amerena, M.D.
Family Medicine Physician in Frederick, Maryland.
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
2K
Medicare Part D claims · 192 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
91%
generic claims · 8% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$15.2
1 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
James Amerena, M.D. filed 1,591 Medicare Part D claims in 2023 as a Family Medicine Physician in Frederick, Maryland, prescribing 91% generic.
- 2K
- Part D claims, 2023
- 91%
- generic prescribing
- $15.2
- 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.
James Amerena, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,591 Top 19% higher than 81% 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)
James Amerena, 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 James Amerena, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
1,591 53% vs specialty avg
Specialty distribution in Maryland
How Family Medicine Physician compares to other specialties among Maryland 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).
James Amerena, M.D. appears in the CMS NPPES registry as a Family Medicine Physician provider holding M.D. credentials at 9093 RIDGEFIELD DR, Frederick, MD, 21701, with a listed phone of (301) 682-4100. NPI 1912981929 was issued on 12/02/2005.
Medicare Part D records for calendar year 2023 show 1,591 prescription claims written by this provider, covering 192 Medicare beneficiaries and totaling roughly $147K in drug spend, split 8% brand-name and 91% generic by claim count, with an opioid prescribing rate of 4.1%.
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 | 1912981929 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 12/02/2005 |
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 James Amerena, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$15
Largest payer
Novo Nordisk Inc
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 · Generic-heavy
James Amerena, M.D. - brand share 8.0%
Family Medicine Physician average
8% brand-name claims vs 91% generic, on 1,591 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.
1,591
Total Claims
$147K
Total Drug Cost
192
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 3,574
- Total Day Supply
- 104,600
- Brand vs Generic
- 8% brand / 91% generic
- Brand Drug Cost
- $121K
- Generic Drug Cost
- $25K
- Opioid Claims
- 66 (4.1% rate)
- Antibiotic Claims
- 39
Patient Demographics
- Average Patient Age
- 72.8 years
- Avg HCC Risk Score
- 1.22
- Gender Split
- 29% female / 71% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What James Amerena, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
100 claims
- Levothyroxine Sodium
Levothyroxine Sodium
69 claims
- Amlodipine Besylate
Amlodipine Besylate
65 claims
- Zolpidem Tartrate
Zolpidem Tartrate
50 claims
- Pravastatin Sodium
Pravastatin Sodium
43 claims
- Allopurinol
Allopurinol
42 claims
- Escitalopram Oxalate
Escitalopram Oxalate
41 claims
- Tamsulosin Hcl
Tamsulosin Hcl
40 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 100 |
| Levothyroxine Sodium | 69 |
| Amlodipine Besylate | 65 |
| Zolpidem Tartrate | 50 |
| Pravastatin Sodium | 43 |
| Allopurinol | 42 |
| Escitalopram Oxalate | 41 |
| Tamsulosin Hcl | 40 |
| Clonazepam | 39 |
| Simvastatin | 38 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How James Amerena, 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
James Amerena, M.D.'s 1,591 claims are below the specialty average of 3,418.
Nearby Family Medicine Physician Providers in Maryland
Other clinicians with the same primary specialty enrolled in Maryland, drawn from the same CMS NPPES roster as Amerena.
Dr. Amelia Abban
CRNP-BC
Laurel, MD
Dr. Peter Abbott
MD
Willards, MD
Dr. Hanan Aboumatar
MD, MPH
Baltimore, MD
Dr. Ndubuisi Achufusi
M.D.
Greenbelt, MD
Dr. Jose Acol
MD
Mount Airy, MD
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 Maryland 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.
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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is James Amerena, M.D.'s specialty? ▼
James Amerena, M.D. specializes in Family Medicine Physician and practices in Frederick, Maryland. Credentials: M.D..
How much does James Amerena, M.D. prescribe under Medicare Part D? ▼
In 2023, James Amerena, M.D. wrote 1,591 Medicare Part D claims totaling $147K in drug costs for 192 beneficiaries.
Where is James Amerena, M.D. located? ▼
James Amerena, M.D. is located at 9093 RIDGEFIELD DR, Frederick, MD, 21701. Phone: (301) 682-4100.
What is James Amerena, M.D.'s NPI number? ▼
James Amerena, M.D.'s National Provider Identifier (NPI) is 1912981929, issued on 12/02/2005.
Does James Amerena, M.D. prescribe more brand-name or generic drugs? ▼
James Amerena, M.D.'s prescribing is 8% brand-name and 91% generic drugs by claim count, with $121K in brand drug costs.
Does James Amerena, M.D. prescribe opioids? ▼
Yes, James Amerena, M.D. had 66 opioid claims in 2023 with an opioid prescribing rate of 4.1%.
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.
What drugs does James Amerena, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, James Amerena, M.D.'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 James Amerena, M.D. accept Medicare? ▼
James Amerena, M.D. appears in CMS Medicare data with 1,591 Part D claims and 192 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify James Amerena, M.D.'s credentials? ▼
James Amerena, M.D.'s NPI is 1912981929 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.