NPI registry status
Active
2026 NPPES data Gerontology Nurse Practitioner NPI 1619564192 APRN
Verify on CMS → Dennis Marquez, APRN
Gerontology Nurse Practitioner in Lake Oswego, Oregon.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 9,706 in Gerontology Nurse Practitioner, 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 · 123 beneficiaries · Gerontology Nurse Practitioner avg: 1K
Generic prescribing
88%
generic claims · 11% 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
Dennis Marquez, APRN filed 1,775 Medicare Part D claims in 2023 as a Gerontology Nurse Practitioner in Lake Oswego, Oregon, prescribing 88% generic.
- 2K
- Part D claims, 2023
- 88%
- generic prescribing
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.
Dennis Marquez, APRN's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,775 Top 17% higher than 83% 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 Dennis Marquez, APRN?
Quality data not reportedPrimary specialty
Gerontology Nurse Practitioner
Medicare Part D claims
1,775 38% vs specialty avg
Specialty distribution in Oregon
How Gerontology Nurse Practitioner compares to other specialties among Oregon 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 Gerontology Nurse Practitioner. 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).
Dennis Marquez, APRN appears in the CMS NPPES registry as a Gerontology Nurse Practitioner provider holding APRN credentials at 5 CENTERPOINTE DR STE 600, Lake Oswego, OR, 97035, with a listed phone of (503) 603-7355. NPI 1619564192 was issued on 12/30/2020.
Medicare Part D records for calendar year 2023 show 1,775 prescription claims written by this provider, covering 123 Medicare beneficiaries and totaling roughly $93K in drug spend, split 11% brand-name and 88% generic by claim count, with an opioid prescribing rate of 16.4%.
Gerontology Nurse Practitioner is a mid-sized specialty nationwide, with 9,706 enrolled providers across 54 states and an average of 1,283 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 | 1619564192 |
|---|---|
| Specialty | Gerontology Nurse Practitioner |
| Credentials | APRN |
| Gender | Male |
| NPI Issued | 12/30/2020 |
Brand vs generic prescribing mix · Typical
Dennis Marquez, APRN - brand share 11.0%
Gerontology Nurse Practitioner average
11% brand-name claims vs 88% generic, on 1,775 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.
1,775
Total Claims
$93K
Total Drug Cost
123
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,783
- Total Day Supply
- 38,181
- Brand vs Generic
- 11% brand / 88% generic
- Brand Drug Cost
- $51K
- Generic Drug Cost
- $40K
- Opioid Claims
- 291 (16.4% rate)
- Antibiotic Claims
- 62
Patient Demographics
- Average Patient Age
- 79.5 years
- Avg HCC Risk Score
- 3.29
- Gender Split
- 73% female / 27% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Dennis Marquez, APRN prescribes most
Top Medicare Part D drugs by claim count, 2023
- Oxycodone Hcl
Oxycodone Hcl
105 claims
- Tramadol Hcl
Tramadol Hcl
63 claims
- Lisinopril
Lisinopril
58 claims
- Atorvastatin Calcium
Atorvastatin Calcium
57 claims
- Eliquis
Eliquis
54 claims
- Warfarin Sodium
Warfarin Sodium
53 claims
- Gabapentin
Gabapentin
51 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
50 claims
| Drug | Claims |
|---|---|
| Oxycodone Hcl | 105 |
| Tramadol Hcl | 63 |
| Lisinopril | 58 |
| Atorvastatin Calcium | 57 |
| Eliquis Apixaban | 54 |
| Warfarin Sodium | 53 |
| Gabapentin | 51 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 50 |
| Quetiapine Fumarate | 41 |
| Tamsulosin Hcl | 40 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gerontology Nurse Practitioner Overview
How Dennis Marquez, APRN fits within the Gerontology Nurse Practitioner landscape nationally.
9,706
Gerontology Nurse Practitioner Providers in US
54
States with Gerontology Nurse Practitioner
1,283
Avg Claims per Provider
Dennis Marquez, APRN's 1,775 claims are above the specialty average of 1,283.
Nearby Gerontology Nurse Practitioner Providers in Oregon
Other clinicians with the same primary specialty enrolled in Oregon, drawn from the same CMS NPPES roster as Marquez.
Dr. Alexandria Alexander
APRN
Seaside, OR
Dr. Elizabeth Apollo-Loomis
APNP
Stayton, OR
Dr. Leon Aylett
AGPCNP
La Grande, OR
Dr. Sarah Bereznai
NP
Portland, OR
Dr. Lauren Brown
NP
Portland, OR
Compare Gerontology Nurse Practitioner 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 Oregon medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gerontology Nurse Practitioner 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 Dennis Marquez, APRN's specialty? ▼
Dennis Marquez, APRN specializes in Gerontology Nurse Practitioner and practices in Lake Oswego, Oregon. Credentials: APRN.
How much does Dennis Marquez, APRN prescribe under Medicare Part D? ▼
In 2023, Dennis Marquez, APRN wrote 1,775 Medicare Part D claims totaling $93K in drug costs for 123 beneficiaries.
Where is Dennis Marquez, APRN located? ▼
Dennis Marquez, APRN is located at 5 CENTERPOINTE DR STE 600, Lake Oswego, OR, 97035. Phone: (503) 603-7355.
What is Dennis Marquez, APRN's NPI number? ▼
Dennis Marquez, APRN's National Provider Identifier (NPI) is 1619564192, issued on 12/30/2020.
Does Dennis Marquez, APRN prescribe more brand-name or generic drugs? ▼
Dennis Marquez, APRN's prescribing is 11% brand-name and 88% generic drugs by claim count, with $51K in brand drug costs.
Does Dennis Marquez, APRN prescribe opioids? ▼
Yes, Dennis Marquez, APRN had 291 opioid claims in 2023 with an opioid prescribing rate of 16.4%.
How many Gerontology Nurse Practitioner providers are there in the US? ▼
There are 9,706 Gerontology Nurse Practitioner providers across 54 states in the US. The average Gerontology Nurse Practitioner provider writes 1,283 Medicare Part D claims per year.
What drugs does Dennis Marquez, APRN prescribe most often? ▼
Based on 2023 Medicare Part D data, Dennis Marquez, APRN's most frequently prescribed drugs include Oxycodone Hcl, Tramadol Hcl, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Dennis Marquez, APRN accept Medicare? ▼
Dennis Marquez, APRN appears in CMS Medicare data with 1,775 Part D claims and 123 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Dennis Marquez, APRN's credentials? ▼
Dennis Marquez, APRN's NPI is 1619564192 with credentials APRN. 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.