Quick answers
- Does Karen C. Brennan accept Medicare assignment?
- Medicare's clinician data says Karen C. Brennan may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Karen C. Brennan see?
- In 2024, CMS data shows 50 Original Medicare patients and 336 services for Karen C. Brennan. This counts Original Medicare only and measures volume, not quality.
- What is Karen C. Brennan's NPI number?
- 1356554901. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Karen C. Brennan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 50 |
|---|---|
| Services billed to Medicare | 336 |
| Different services or procedures | 1 |
| Participating Medicare provider | No |
| Average age of these patients | 74 |
Most frequent services
- Chiropractic manipulative treatment, 3-4 spinal regions (98941)336 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure72%
- Arthritis40%
- Diabetes24%
- Chronic kidney disease24%
- Ischemic heart disease22%
Practice locations
Addresses where Karen C. Brennan is enrolled with Medicare (CMS data updated October 2, 2026).
- 2105 McComas WayVirginia Beach, VA 23456 (757) 430‑8000
Group practices
Medicare enrollment lists Karen C. Brennan as a member of this group (CMS data updated October 2, 2026).
- Brennan Chiropractic PC2 clinicians in the group
Specialties
- Chiropracticprimary
Other chiropractors in Virginia Beach
Clinicians with the same Medicare primary specialty in Virginia Beach, VA — not a recommendation.
Other clinicians in Brennan Chiropractic PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CH |
|---|---|
| School | Palmer College Chiropractic - West Sunnyvale |
| Graduation year | 1991 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1356554901 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians