NPI registry status
Active
2026 NPPES data Radiation Oncology Physician NPI 1578092508 MD
Verify on CMS → Alexandra Brennan, MD
Radiation Oncology Physician in Joint Base Lewis McChord, Washington.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 6,141 in Radiation Oncology 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.
What the federal data shows
Alexandra Brennan, MD is a Radiation Oncology Physician in Joint Base Lewis McChord, Washington, listed in the federal CMS National Provider Identifier registry.
- #104
- Radiation Oncology Physician rank among Washington specialties
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.
Federal trust snapshot
What official records show about Alexandra Brennan, MD
Bare NPI registry listing — limited federal enrichment beyond basic enumeration. Verify all credentials with official sources.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1578092508), first enumerated 06/04/2017.
Source: CMS NPPES
- Not in federal data
Medicare Part D participation
No 2023 Medicare Part D prescribing volume appears in the CMS public file for this NPI (may reflect specialty, new enrollment, or non-prescribing role).
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- State context
State board disciplinary context
Washington statewide board action statistics are published annually — these figures describe aggregate state activity, not Alexandra Brennan, MD's individual license status. Verify directly with the state medical board.
Source: WMC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1578092508 · Radiation Oncology Physician
NPI-10 · ENUM-RECENT · TAX-MID · RX-NONE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1578092508
- ENUM-RECENT 2017
- TAX-MID 6K Radiation Oncology
- RX-NONE No Part D
- BOOK-THIN 188 in Washington
- PHOTO-ENUM Daniel Vanderbilt · 2017
◑
Board-eligible specialty (heuristic, not verified)
Alexandra Brennan, 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 Alexandra Brennan, MD?
Quality data not reportedPrimary specialty
Radiation Oncology Physician
Specialty distribution in Washington
How Radiation Oncology Physician compares to other specialties among Washington 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 Radiation Oncology 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).
Practice Address
Provider Details
| NPI | 1578092508 |
|---|---|
| Specialty | Radiation Oncology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 06/04/2017 |
License & disciplinary context - Washington WMC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~34K Washington medical licensees in 2023 - they are NOT specific to Alexandra Brennan, MD. To verify Alexandra Brennan, MD's current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases
WMC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Washington disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Radiation Oncology Physician Overview
How Alexandra Brennan, MD fits within the Radiation Oncology Physician landscape nationally.
6,141
Radiation Oncology Physician Providers in US
53
States with Radiation Oncology Physician
135
Avg Claims per Provider
Nationwide Radiation Oncology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Brennan, both outside Washington so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2017)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Radiation Oncology Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Brennan.
One of 188 Radiation Oncology Physician providers enrolled in Washington, 5 are shown here.
Dr. Ahsen Ahmed
MD
Seattle, WA
Saif Aljabab
MBBS
Seattle, WA
Dr. Gregory Allen
M.D., PHD
Lacey, WA
Dr. Smith Apisarnthanarax
MD
Seattle, WA
Dr. Andrea Arnett
M.D., PH.D.
Bellingham, WA
Compare Radiation Oncology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Alexandra Brennan, MD's specialty? ▼
Alexandra Brennan, MD specializes in Radiation Oncology Physician and practices in Joint Base Lewis McChord, Washington. Credentials: MD.
Where is Alexandra Brennan, MD located? ▼
Alexandra Brennan, MD is located at MADIGAN ARMY MEDICAL CENTER, Joint Base Lewis McChord, WA, 98431. Phone: (253) 968-2090.
What is Alexandra Brennan, MD's NPI number? ▼
Alexandra Brennan, MD's National Provider Identifier (NPI) is 1578092508, issued on 06/04/2017.
How many Radiation Oncology Physician providers are there in the US? ▼
There are 6,141 Radiation Oncology Physician providers across 53 states in the US. The average Radiation Oncology Physician provider writes 135 Medicare Part D claims per year.
Does Alexandra Brennan, MD accept Medicare? ▼
Alexandra Brennan, MD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alexandra Brennan, MD's credentials? ▼
Alexandra Brennan, MD's NPI is 1578092508 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.
- 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 August 2026 (NPPES) / 2024 (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
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 August 2026.