NPI registry status
Active
2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1184696148 MD
Verify on CMS → Rex Biedenbender, MD
Geriatric Medicine (Internal Medicine) Physician in Virginia Beach, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 4,161 in Geriatric Medicine (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
10K
Medicare Part D claims · 435 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
81%
generic claims · 19% 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
Rex Biedenbender, MD filed 9,966 Medicare Part D claims in 2023 as a Geriatric Medicine (Internal Medicine) Physician in Virginia Beach, Virginia, prescribing 81% generic.
- 10K
- Part D claims, 2023
- 81%
- 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.
Rex Biedenbender, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
9,966 Top 2% higher than 98% 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)
Rex Biedenbender, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Rex Biedenbender, MD?
Quality data not reportedPrimary specialty
Geriatric Medicine (Internal Medicine) Physician
Medicare Part D claims
9,966 124% vs specialty avg
Specialty distribution in Virginia
How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Virginia 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 Geriatric Medicine (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).
Rex Biedenbender, MD appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding MD credentials at 4624 MISTRAL LN, Virginia Beach, VA, 23456, with a listed phone of (757) 303-6023. NPI 1184696148 was issued on 02/03/2006.
Medicare Part D records for calendar year 2023 show 9,966 prescription claims written by this provider, covering 435 Medicare beneficiaries and totaling roughly $734K in drug spend, split 19% brand-name and 81% generic by claim count, with an opioid prescribing rate of 4.1%.
Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,161 enrolled providers across 52 states and an average of 4,450 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 | 1184696148 |
|---|---|
| Specialty | Geriatric Medicine (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 02/03/2006 |
Hospital and facility affiliations
Facilities where Rex Biedenbender, 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.
Legacy Care Aco LLC
Virginia Beach, VA
Legacy Care LLC
Virginia Beach, VA
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 · Typical
Rex Biedenbender, MD - brand share 19.0%
Geriatric Medicine (Internal Medicine) Physician average
19% brand-name claims vs 81% generic, on 9,966 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.
9,966
Total Claims
$734K
Total Drug Cost
435
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 10,016
- Total Day Supply
- 221,058
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $478K
- Generic Drug Cost
- $255K
- Opioid Claims
- 407 (4.1% rate)
- Antibiotic Claims
- 280
Patient Demographics
- Average Patient Age
- 77.7 years
- Avg HCC Risk Score
- 2.84
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 54, 65-74: 114, 75-84: 137, 85+: 130
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Rex Biedenbender, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Eliquis
Eliquis
469 claims
- Atorvastatin Calcium
Atorvastatin Calcium
415 claims
- Amlodipine Besylate
Amlodipine Besylate
331 claims
- Gabapentin
Gabapentin
323 claims
- Trazodone Hcl
Trazodone Hcl
274 claims
- Furosemide
Furosemide
247 claims
- Oxycodone Hcl
Oxycodone Hcl
221 claims
- Metoprolol Tartrate
Metoprolol Tartrate
205 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 469 |
| Atorvastatin Calcium | 415 |
| Amlodipine Besylate | 331 |
| Gabapentin | 323 |
| Trazodone Hcl | 274 |
| Furosemide | 247 |
| Oxycodone Hcl | 221 |
| Metoprolol Tartrate | 205 |
| Levothyroxine Sodium | 203 |
| Hydralazine Hcl | 188 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Geriatric Medicine (Internal Medicine) Physician in VA →
All providers in Virginia →
Compare specialties →
Geriatric Medicine (Internal Medicine) Physician Overview
How Rex Biedenbender, MD fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.
4,161
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider
Rex Biedenbender, MD's 9,966 claims are above the specialty average of 4,450.
Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Biedenbender.
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 Virginia medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Geriatric Medicine (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 Rex Biedenbender, MD's specialty? ▼
Rex Biedenbender, MD specializes in Geriatric Medicine (Internal Medicine) Physician and practices in Virginia Beach, Virginia. Credentials: MD.
How much does Rex Biedenbender, MD prescribe under Medicare Part D? ▼
In 2023, Rex Biedenbender, MD wrote 9,966 Medicare Part D claims totaling $734K in drug costs for 435 beneficiaries.
Where is Rex Biedenbender, MD located? ▼
Rex Biedenbender, MD is located at 4624 MISTRAL LN, Virginia Beach, VA, 23456. Phone: (757) 303-6023.
What is Rex Biedenbender, MD's NPI number? ▼
Rex Biedenbender, MD's National Provider Identifier (NPI) is 1184696148, issued on 02/03/2006.
Does Rex Biedenbender, MD prescribe more brand-name or generic drugs? ▼
Rex Biedenbender, MD's prescribing is 19% brand-name and 81% generic drugs by claim count, with $478K in brand drug costs.
Does Rex Biedenbender, MD prescribe opioids? ▼
Yes, Rex Biedenbender, MD had 407 opioid claims in 2023 with an opioid prescribing rate of 4.1%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 4,161 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,450 Medicare Part D claims per year.
What drugs does Rex Biedenbender, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Rex Biedenbender, MD's most frequently prescribed drugs include Eliquis, Atorvastatin Calcium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Rex Biedenbender, MD accept Medicare? ▼
Rex Biedenbender, MD appears in CMS Medicare data with 9,966 Part D claims and 435 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Rex Biedenbender, MD's credentials? ▼
Rex Biedenbender, MD's NPI is 1184696148 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.