Quick answers
- Does Katharine M. Obrien accept Medicare assignment?
- Yes. Medicare's clinician data says Katharine M. Obrien 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 Katharine M. Obrien see?
- In 2024, CMS data shows 54 Original Medicare patients and 186 services for Katharine M. Obrien. This counts Original Medicare only and measures volume, not quality.
- What is Katharine M. Obrien's NPI number?
- 1083720718. 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 Katharine M. Obrien, 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 | 54 |
|---|---|
| Services billed to Medicare | 186 |
| Different services or procedures | 13 |
| Participating Medicare provider | Yes |
| Average age of these patients | 67 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)67 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)66 services
- Annual depression screening, 5 to 15 minutes (G0444)17 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 pressure72%
- High cholesterol56%
- Diabetes39%
- Arthritis33%
- Chronic kidney disease26%
Practice locations
Addresses where Katharine M. Obrien is enrolled with Medicare (CMS data updated October 2, 2026).
- 1600 E Florida Ave, Suite 103Hemet, CA 92544 (951) 929‑8121
Group practices
Medicare enrollment lists Katharine M. Obrien as a member of this group (CMS data updated October 2, 2026).
- Kolli Medical Corporation5 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Hemet
Clinicians with the same Medicare primary specialty in Hemet, CA — not a recommendation.
Other clinicians in Kolli Medical Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 1995 (31 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1083720718 |
| 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