Quick answers
- Does Rosalia R. Osias accept Medicare assignment?
- Yes. Medicare's clinician data says Rosalia R. Osias 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 Rosalia R. Osias see?
- In 2024, CMS data shows 222 Original Medicare patients and 2,974 services for Rosalia R. Osias. This counts Original Medicare only and measures volume, not quality.
- What is Rosalia R. Osias's NPI number?
- 1669582938. 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 Rosalia R. Osias, 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 | 222 |
|---|---|
| Services billed to Medicare | 2,974 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Telephone medical discussion with physician, 11-20 minutes (99442)1,249 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)665 services
- Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes (99309)331 services
- Physician or allowed practitioner re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians a (G0179)175 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)155 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%
- Diabetes57%
- Chronic kidney disease50%
- Arthritis43%
- Ischemic heart disease39%
Practice locations
Addresses where Rosalia R. Osias is enrolled with Medicare (CMS data updated October 2, 2026).
- 3340 W Ball Rd, Suite FAnaheim, CA 92804 (714) 723‑0787
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Anaheim
Clinicians with the same Medicare primary specialty in Anaheim, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1984 (42 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1669582938 |
| 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