Quick answers
- Does Karen A. Mackinnon accept Medicare assignment?
- Yes. Medicare's clinician data says Karen A. Mackinnon 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. Mackinnon see?
- In 2024, CMS data shows 27 Original Medicare patients and 38 services for Karen A. Mackinnon. This counts Original Medicare only and measures volume, not quality.
- What is Karen A. Mackinnon's NPI number?
- 1346384328. 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. Mackinnon, 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 | 27 |
|---|---|
| Services billed to Medicare | 38 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 65 |
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 cholesterol70%
- Arthritis52%
- Anxiety52%
- High blood pressure48%
Hospitals where Karen A. Mackinnon works
Medicare's Facility Affiliation Data lists Karen A. Mackinnon at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210009
Practice locations
Addresses where Karen A. Mackinnon is enrolled with Medicare (CMS data updated October 2, 2026).
- 1000 E Eager St, E Baltimore Med CtrBaltimore, MD 21202 (410) 522‑9800
- 10710 Charter Dr, Suite 200Columbia, MD 21044 (410) 884‑8000
Group practices
Medicare enrollment lists Karen A. Mackinnon as a member of this group (CMS data updated October 2, 2026).
- Johns Hopkins Community Physicians, Inc763 clinicians in the group
Specialties
Find other clinicians: Certified Nurse Midwife (CNM), Maryland →
Other nurse midwifes in Baltimore
Clinicians with the same Medicare primary specialty in Baltimore, MD — not a recommendation.
Other clinicians in Johns Hopkins Community Physicians, Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CNM |
|---|---|
| Graduation year | 2001 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346384328 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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