Quick answers
- Does Maria Gaines-Onwukwe accept Medicare assignment?
- Yes. Medicare's clinician data says Maria Gaines-Onwukwe 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 Maria Gaines-Onwukwe see?
- In 2024, CMS data shows 143 Original Medicare patients and 393 services for Maria Gaines-Onwukwe. This counts Original Medicare only and measures volume, not quality.
- What is Maria Gaines-Onwukwe's NPI number?
- 1154009173. 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 Maria Gaines-Onwukwe, 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 | 143 |
|---|---|
| Services billed to Medicare | 393 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)251 services
- Hospital discharge day management, more than 30 minutes (99239)77 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)44 services
- Administration of a standardized, evidence-based social determinants of health risk assessment tool, 5-15 minutes (G0136)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%
- Arthritis64%
- Ischemic heart disease61%
- Diabetes53%
- Heart failure51%
Hospitals where Maria Gaines-Onwukwe works
Medicare's Facility Affiliation Data lists Maria Gaines-Onwukwe 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.
- 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 Maria Gaines-Onwukwe is enrolled with Medicare (CMS data updated October 2, 2026).
- 660 McHenry RdAberdeen, MD 21001 (443) 843‑5000
Group practices
Medicare enrollment lists Maria Gaines-Onwukwe as a member of this group (CMS data updated October 2, 2026).
- Adfinitas Health at Upper Chesapeake Aberdeen LLC40 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Aberdeen
Clinicians with the same Medicare primary specialty in Aberdeen, MD — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2022 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154009173 |
| 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