Quick answers
- Does Karen A. Maciejko accept Medicare assignment?
- Yes. Medicare's clinician data says Karen A. Maciejko accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Karen A. Maciejko see?
- In 2024, CMS data shows 21 Original Medicare patients and 27 services for Karen A. Maciejko. This counts Original Medicare only and measures volume, not quality.
- What is Karen A. Maciejko's NPI number?
- 1407565427. 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 A. Maciejko, 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 | 21 |
|---|---|
| Services billed to Medicare | 27 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)18 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 blood pressure57%
- High cholesterol57%
Practice locations
Addresses where Karen A. Maciejko is enrolled with Medicare (CMS data updated October 2, 2026).
- 411 3rd StSan Rafael, CA 94901 (415) 924‑4525
- 7428 Redwood Blvd, Suite 100Novato, CA 94945 (415) 895‑5216
Group practices
Medicare enrollment lists Karen A. Maciejko as a member of these groups (CMS data updated October 2, 2026).
- Brett V Curtis MD a Professional Corporation Inc7 clinicians in the group
- Brett V Curtis MD and Associates a Professional Corporation4 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in San Rafael
Clinicians with the same Medicare primary specialty in San Rafael, CA — not a recommendation.
Other clinicians in Brett V Curtis MD a Professional Corporation Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2022 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1407565427 |
| 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