Quick answers
- Does Gretchen Quinones Barbosa accept Medicare assignment?
- Yes. Medicare's clinician data says Gretchen Quinones Barbosa 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 Gretchen Quinones Barbosa see?
- In 2024, CMS data shows 324 Original Medicare patients and 498 services for Gretchen Quinones Barbosa. This counts Original Medicare only and measures volume, not quality.
- What is Gretchen Quinones Barbosa's NPI number?
- 1659502771. 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 Gretchen Quinones Barbosa, 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 | 324 |
|---|---|
| Services billed to Medicare | 498 |
| Different services or procedures | 68 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Dxa bone density measurement of hip, pelvis, spine (77080)87 services
- X-ray of chest, 1 view (71045)42 services
- Ultrasound scan of head and neck soft tissue (76536)30 services
- X-ray of chest, 2 views (71046)28 services
- Complete ultrasound scan of abdomen (76700)23 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%
- Diabetes67%
- Arthritis55%
- Osteoporosis34%
- Chronic kidney disease30%
Practice locations
Addresses where Gretchen Quinones Barbosa is enrolled with Medicare (CMS data updated October 2, 2026).
- Ave De Diego 126 Sein Medical Plaza O, Reparto MetropolitanoSan Juan, PR 00921 (787) 753‑4631
- Ave De Diego 126 Sein Medical Plaza Oficina, 1 Reaprto MetropolitanoSan Juan, PR 00921
Group practices
Medicare enrollment lists Gretchen Quinones Barbosa as a member of this group (CMS data updated October 2, 2026).
- Roberto J Sein and Rafael M Rivera PTR5 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in San Juan
Clinicians with the same Medicare primary specialty in San Juan, PR — not a recommendation.
Other clinicians in Roberto J Sein and Rafael M Rivera PTR
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Puerto Rico School Of Medicine |
| Graduation year | 2009 (17 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659502771 |
| 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