Quick answers
- Does Mariana R. Defreitas accept Medicare assignment?
- Yes. Medicare's clinician data says Mariana R. Defreitas 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 Mariana R. Defreitas see?
- In 2024, CMS data shows 1,510 Original Medicare patients and 2,781 services for Mariana R. Defreitas. This counts Original Medicare only and measures volume, not quality.
- What is Mariana R. Defreitas's NPI number?
- 1134650641. 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 Mariana R. Defreitas, 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 | 1,510 |
|---|---|
| Services billed to Medicare | 2,781 |
| Different services or procedures | 109 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- X-ray of chest, 2 views (71046)331 services
- Ct scan head or brain without contrast (70450)321 services
- X-ray of chest, 1 view (71045)320 services
- Ct scan of abdomen and pelvis with contrast (74177)227 services
- Ct scan of upper spine without contrast (72125)156 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 cholesterol72%
- Arthritis60%
- Anxiety41%
- Depression38%
- Ischemic heart disease36%
Hospitals where Mariana R. Defreitas works
Medicare's Facility Affiliation Data lists Mariana R. Defreitas 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.
- Cape Fear Valley Medical CenterFayetteville, NC · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 340028
- Chatham Hospital IncSiler City, NC · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 341311
- Duke University HospitalDurham, NC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 340030
- UNC HospitalsChapel Hill, NC · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 340061
Practice locations
Addresses where Mariana R. Defreitas is enrolled with Medicare (CMS data updated October 2, 2026).
- 101 Manning DrChapel Hill, NC 27514 (984) 974‑1000
Group practices
Medicare enrollment lists Mariana R. Defreitas as a member of this group (CMS data updated October 2, 2026).
- University of North Carolina at Chapel Hill2,052 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Chapel Hill
Clinicians with the same Medicare primary specialty in Chapel Hill, NC — not a recommendation.
Other clinicians in University of North Carolina at Chapel Hill
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Medical School |
| Graduation year | 2017 (9 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134650641 |
| 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