ROBERT BRENNAN, MD
Infectious Disease Physician in LYNCHBURG, Virginia. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.
What the federal data shows
ROBERT BRENNAN, MD filed 384 Medicare Part D claims in 2023 as a Infectious Disease Physician in LYNCHBURG, Virginia, prescribing 45% generic.
- 384
- Part D claims, 2023
- 45%
- 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.
ROBERT BRENNAN, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023 — across all CMS prescribers nationally
384 Top 43% higher than 57% 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
ROBERT BRENNAN, 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 ROBERT BRENNAN, MD?
Quality data not reportedPrimary specialty
Medicare Part D claims
Specialty distribution in Virginia
How Infectious Disease Physician compares to other specialties among Virginia providers
Infectious Disease Physician share within Virginia
Infectious Disease Physician is one of the more visible NUCC categories in Virginia
Each bar reflects the share of in-state providers whose primary NUCC taxonomy matches the specialty. Long tail of ~690 NUCC codes folded into "Other" to keep the comparison legible.
Specialty board-certification context
Estimated specialty board-certified rate — Infectious Disease Physician (ABMS / AOA reference)
- Est. board-certified rate
- 78%
- Infectious Disease Physician ABMS/AOA estimate
Est. board-certified rate (Infectious Disease Physician) — ABMS / AOA estimate
Verify credentials
- Verify via ABMS free public lookup
- Verify via AOA osteopathic boards
- Specialty volume Infectious Disease Physician US NPIs
Specialty board-certified rate — Infectious Disease Physician estimate
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus Maintenance of Certification cycles. CMS does not publish a per-provider board-certification field; the figure shown is the specialty-level estimated rate from ABMS / AOA reference data.
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).
ROBERT BRENNAN, MD appears in the CMS NPPES registry as a Infectious Disease Physician provider holding MD credentials at 2215 LANDOVER PL, LYNCHBURG, VA, 24501, with a listed phone of (434) 947-3900. NPI 1659355170 was issued on 11/30/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what BRENNAN most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.
Medicare Part D records for calendar year 2023 show 384 prescription claims written by this provider, covering 69 Medicare beneficiaries and totaling roughly $861K in drug spend, split 55% brand-name and 45% generic by claim count. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,292 enrolled providers across 54 states and an average of 816 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 | 1659355170 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/30/2005 |
Verify this provider's license
PlainDoctor pulls this profile from the CMS NPPES public registry. Confirm ROBERT BRENNAN, MD's current license status, disciplinary history, and board certifications with the Virginia Board of Medicine in Virginia before relying on this page for a clinical or care decision.
How we sourced this profile
Hospital and facility affiliations
Facilities where ROBERT BRENNAN, 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.
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 · Brand-heavy
55% brand-name claims vs 45% generic, on 384 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.
Prescribing Breakdown
- 30-Day Fills
- 434
- Total Day Supply
- 10,002
- Brand vs Generic
- 55% brand / 45% generic
- Brand Drug Cost
- $814K
- Generic Drug Cost
- $47K
- Antibiotic Claims
- 123
Patient Demographics
- Average Patient Age
- 66.9 years
- Avg HCC Risk Score
- 2.09
- Gender Split
- 48% female / 52% male
- Age Distribution
- <65: 22, 65-74: 32, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What ROBERT BRENNAN, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Biktarvy
Biktarvy
41 claims
- Descovy
Descovy
35 claims
- Sodium Chloride
Sodium Chloride
33 claims
- Ceftriaxone
Ceftriaxone
25 claims
- Tivicay
Tivicay
24 claims
- Daptomycin
Daptomycin
23 claims
- Efavirenz
Efavirenz
21 claims
- Triumeq 16
Triumeq
16 claims
| Drug | Claims |
|---|---|
| Biktarvy Bictegrav/Emtricit/Tenofov Ala | 41 |
| Descovy Emtricitabine/Tenofov Alafenam | 35 |
| Sodium Chloride 0.9 % Sodium Chloride | 33 |
| Ceftriaxone Ceftriaxone Sodium | 25 |
| Tivicay Dolutegravir Sodium | 24 |
| Daptomycin | 23 |
| Efavirenz | 21 |
| Triumeq Abacavir/Dolutegravir/Lamivudi | 16 |
| Amoxicillin | 14 |
| Prezcobix Darunavir/Cobicistat | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How ROBERT BRENNAN, MD fits within the Infectious Disease Physician landscape nationally.
ROBERT BRENNAN, MD's 384 claims are below the specialty average of 816.
Nearby Infectious Disease Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as BRENNAN.
Compare Infectious Disease Physician nationally: see state-by-state distribution →
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
Explore Virginia
Frequently Asked Questions
What is ROBERT BRENNAN, MD's specialty? ▼
How much does ROBERT BRENNAN, MD prescribe under Medicare Part D? ▼
Where is ROBERT BRENNAN, MD located? ▼
What is ROBERT BRENNAN, MD's NPI number? ▼
Does ROBERT BRENNAN, MD prescribe more brand-name or generic drugs? ▼
How many Infectious Disease Physician providers are there in the US? ▼
What drugs does ROBERT BRENNAN, MD prescribe most often? ▼
Does ROBERT BRENNAN, MD accept Medicare? ▼
How can I verify ROBERT BRENNAN, MD's credentials? ▼
Data Sources
- 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