Quick answers
- Does Karen Ann P. Rayos accept Medicare assignment?
- Yes. Medicare's clinician data says Karen Ann P. Rayos 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 Karen Ann P. Rayos see?
- In 2024, CMS data shows 38 Original Medicare patients and 145 services for Karen Ann P. Rayos. This counts Original Medicare only and measures volume, not quality.
- What is Karen Ann P. Rayos's NPI number?
- 1114300209. 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 Karen Ann P. Rayos, 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 | 38 |
|---|---|
| Services billed to Medicare | 145 |
| Different services or procedures | 25 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)52 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 cholesterol71%
- Diabetes53%
- Chronic kidney disease45%
- Arthritis37%
- Ischemic heart disease37%
Practice locations
Addresses where Karen Ann P. Rayos is enrolled with Medicare (CMS data updated October 2, 2026).
- 1317 Oakdale Rd, Suite 440Modesto, CA 95355 (209) 522‑3362
Group practices
Medicare enrollment lists Karen Ann P. Rayos as a member of this group (CMS data updated October 2, 2026).
- Family First Medical Care a Professional Corporation18 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Modesto
Clinicians with the same Medicare primary specialty in Modesto, CA — not a recommendation.
Other clinicians in Family First Medical Care a Professional Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2011 (15 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) | 1114300209 |
| 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