Quick answers
- Does Rosa A. Lozada Sierra accept Medicare assignment?
- Medicare's clinician data says Rosa A. Lozada Sierra may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Rosa A. Lozada Sierra see?
- In 2024, CMS data shows 47 Original Medicare patients and 174 services for Rosa A. Lozada Sierra. This counts Original Medicare only and measures volume, not quality.
- What is Rosa A. Lozada Sierra's NPI number?
- 1154707206. 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 Rosa A. Lozada Sierra, 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 | 47 |
|---|---|
| Services billed to Medicare | 174 |
| Different services or procedures | 24 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- New patient complete exam of visual system (92004)27 services
- Established patient problem focused exam of visual system (92012)26 services
- Measurement of corneal curvature and depth of eye (92136)25 services
- Imaging of retina (92134)22 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%
- Diabetes51%
- Arthritis43%
- Chronic kidney disease23%
- Osteoporosis23%
Practice locations
Addresses where Rosa A. Lozada Sierra is enrolled with Medicare (CMS data updated October 2, 2026).
- 239 Ave Arterial HostosSan Juan, PR 00918 (787) 250‑1746
Specialties
- Ophthalmologyprimary
Other ophthalmologists in San Juan
Clinicians with the same Medicare primary specialty in San Juan, PR — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Puerto Rico School Of Medicine |
| Graduation year | 2020 (6 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1154707206 |
| 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