Quick answers
- Does Jeanie J. Ahn accept Medicare assignment?
- Yes. Medicare's clinician data says Jeanie J. Ahn 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 Jeanie J. Ahn see?
- In 2024, CMS data shows 521 Original Medicare patients and 2,685 services for Jeanie J. Ahn. This counts Original Medicare only and measures volume, not quality.
- What is Jeanie J. Ahn's NPI number?
- 1053359356. 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 Jeanie J. Ahn, 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 | 521 |
|---|---|
| Services billed to Medicare | 2,685 |
| Different services or procedures | 29 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)482 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)354 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)326 services
- Dialysis services, 4 or more physician visits per month (20 years or older) (90960)284 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)239 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%
- Chronic kidney disease75%
- Diabetes72%
- Ischemic heart disease55%
- Heart failure53%
Hospitals where Jeanie J. Ahn works
Medicare's Facility Affiliation Data lists Jeanie J. Ahn at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Highland HospitalOakland, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050320
- St Rose HospitalHayward, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: not listed by Medicare · CCN 050002
- Washington HospitalFremont, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050195
Practice locations
Addresses where Jeanie J. Ahn is enrolled with Medicare (CMS data updated October 2, 2026).
- 1999 Mowry Ave, Suite RFremont, CA 94538 (510) 745‑8187
- 27200 Calaroga AveHayward, CA 94545 (510) 783‑2003
Group practices
Medicare enrollment lists Jeanie J. Ahn as a member of this group (CMS data updated October 2, 2026).
- West Coast Kidney56 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Fremont
Clinicians with the same Medicare primary specialty in Fremont, CA — not a recommendation.
Other clinicians in West Coast Kidney
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Illinois College Of Med (chi/peor/rock/chm-Urb) |
| Graduation year | 1996 (30 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) | 1053359356 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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