NPI registry status
Active
2026 NPPES data Dermatology Physician NPI 1336777234 MD
Verify on CMS → Amanda Onalaja-Underwood, MD
Dermatology Physician in Nashville, Tennessee.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 14,610 in Dermatology 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
137
Medicare Part D claims · 50 beneficiaries · Dermatology Physician avg: 729
Generic prescribing
82%
generic claims · 18% 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
Amanda Onalaja-Underwood, MD filed 137 Medicare Part D claims in 2023 as a Dermatology Physician in Nashville, Tennessee, prescribing 82% generic.
- 137
- Part D claims, 2023
- 82%
- 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.
Amanda Onalaja-Underwood, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
137 35th percentile higher than 35% 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)
Amanda Onalaja-Underwood, MD 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 Amanda Onalaja-Underwood, MD?
Quality data not reportedPrimary specialty
Dermatology Physician
Medicare Part D claims
137 81% vs specialty avg
Specialty distribution in Tennessee
How Dermatology Physician compares to other specialties among Tennessee 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 Dermatology 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).
Amanda Onalaja-Underwood, MD appears in the CMS NPPES registry as a Dermatology Physician provider holding MD credentials at 3601 THE VANDERBILT CLINIC, Nashville, TN, 37232, with a listed phone of (615) 322-5000. NPI 1336777234 was issued on 03/28/2020.
Medicare Part D records for calendar year 2023 show 137 prescription claims written by this provider, covering 50 Medicare beneficiaries and totaling roughly $89K in drug spend, split 18% brand-name and 82% generic by claim count.
Dermatology Physician is a mid-sized specialty nationwide, with 14,610 enrolled providers across 53 states and an average of 729 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 | 1336777234 |
|---|---|
| Specialty | Dermatology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 03/28/2020 |
Brand vs generic prescribing mix · Typical
Amanda Onalaja-Underwood, MD - brand share 18.0%
Dermatology Physician average
18% brand-name claims vs 82% generic, on 137 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.
137
Total Claims
$89K
Total Drug Cost
50
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 170
- Total Day Supply
- 4,398
- Brand vs Generic
- 18% brand / 82% generic
- Brand Drug Cost
- $84K
- Generic Drug Cost
- $5K
Patient Demographics
- Average Patient Age
- 68.6 years
- Avg HCC Risk Score
- 1.45
- Gender Split
- 58% female / 42% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Amanda Onalaja-Underwood, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ketoconazole
Ketoconazole
20 claims
- Triamcinolone Acet…
Triamcinolone Acetonide
17 claims
- Clindamycin Phosph…
Clindamycin Phosphate
11 claims
| Drug | Claims |
|---|---|
| Ketoconazole | 20 |
| Triamcinolone Acetonide | 17 |
| Clindamycin Phosphate | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Dermatology Physician Overview
How Amanda Onalaja-Underwood, MD fits within the Dermatology Physician landscape nationally.
14,610
Dermatology Physician Providers in US
53
States with Dermatology Physician
729
Avg Claims per Provider
Amanda Onalaja-Underwood, MD's 137 claims are below the specialty average of 729.
Nearby Dermatology Physician Providers in Tennessee
Other clinicians with the same primary specialty enrolled in Tennessee, drawn from the same CMS NPPES roster as Onalaja-Underwood.
Dr. Vlatka Agnetta
M.D.
Chattanooga, TN
Dr. Adam Allan
DO
Clarksville, TN
Dr. Anne Allen
MD
Knoxville, TN
Dr. Elizabeth Anderson
MD
Knoxville, TN
Dr. Saundrett Arrindell
MD
Nashville, TN
Compare Dermatology 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 Tennessee medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Dermatology 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 Amanda Onalaja-Underwood, MD's specialty? ▼
Amanda Onalaja-Underwood, MD specializes in Dermatology Physician and practices in Nashville, Tennessee. Credentials: MD.
How much does Amanda Onalaja-Underwood, MD prescribe under Medicare Part D? ▼
In 2023, Amanda Onalaja-Underwood, MD wrote 137 Medicare Part D claims totaling $89K in drug costs for 50 beneficiaries.
Where is Amanda Onalaja-Underwood, MD located? ▼
Amanda Onalaja-Underwood, MD is located at 3601 THE VANDERBILT CLINIC, Nashville, TN, 37232. Phone: (615) 322-5000.
What is Amanda Onalaja-Underwood, MD's NPI number? ▼
Amanda Onalaja-Underwood, MD's National Provider Identifier (NPI) is 1336777234, issued on 03/28/2020.
Does Amanda Onalaja-Underwood, MD prescribe more brand-name or generic drugs? ▼
Amanda Onalaja-Underwood, MD's prescribing is 18% brand-name and 82% generic drugs by claim count, with $84K in brand drug costs.
How many Dermatology Physician providers are there in the US? ▼
There are 14,610 Dermatology Physician providers across 53 states in the US. The average Dermatology Physician provider writes 729 Medicare Part D claims per year.
What drugs does Amanda Onalaja-Underwood, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Amanda Onalaja-Underwood, MD's most frequently prescribed drugs include Ketoconazole, Triamcinolone Acetonide, Clindamycin Phosphate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Amanda Onalaja-Underwood, MD accept Medicare? ▼
Amanda Onalaja-Underwood, MD appears in CMS Medicare data with 137 Part D claims and 50 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Amanda Onalaja-Underwood, MD's credentials? ▼
Amanda Onalaja-Underwood, MD's NPI is 1336777234 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.