Quick answers
- Does April L. Karczmarek accept Medicare assignment?
- Medicare's clinician data says April L. Karczmarek may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does April L. Karczmarek see?
- In 2024, CMS data shows 63 Original Medicare patients and 77 services for April L. Karczmarek. This counts Original Medicare only and measures volume, not quality.
- What is April L. Karczmarek's NPI number?
- 1831731652. 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 April L. Karczmarek, 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 | 63 |
|---|---|
| Services billed to Medicare | 77 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)20 services
- Hospital discharge day management, more than 30 minutes (99239)13 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)12 services
- Critical care, first 30-74 minutes (99291)11 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 pressure75%
- High cholesterol75%
- Arthritis65%
- Depression62%
- Chronic kidney disease56%
- Diabetes51%
Hospitals where April L. Karczmarek works
Medicare's Facility Affiliation Data lists April L. Karczmarek 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.
- Johns Hopkins Bayview Medical CenterBaltimore, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210029
- Umd Upper Chesapeake Medical CenterBel Air, MD · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 210049
Practice locations
Addresses where April L. Karczmarek is enrolled with Medicare (CMS data updated October 2, 2026).
- 4940 Eastern AveBaltimore, MD 21224
- 500 Upper Chesapeake DrBel Air, MD 21014 (443) 643‑1000
- 600 N Wolf StBaltimore, MD 21287
- 600 N Wolfe St, Blalock 266Baltimore, MD 21287 (410) 502‑4340
- 660 McHenry RdAberdeen, MD 21001 (443) 843‑5000
Group practices
Medicare enrollment lists April L. Karczmarek as a member of these groups (CMS data updated October 2, 2026).
- Johns Hopkins University2,909 clinicians in the group
- Adfinitas Health at Upper Chesapeake LLC78 clinicians in the group
- Adfinitas Health at Upper Chesapeake Aberdeen LLC40 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Baltimore
Clinicians with the same Medicare primary specialty in Baltimore, MD — not a recommendation.
Other clinicians in Johns Hopkins University
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1831731652 |
| 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