Quick answers
- Does Chelsea Xu accept Medicare assignment?
- Yes. Medicare's clinician data says Chelsea Xu 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 Chelsea Xu see?
- In 2024, CMS data shows 90 Original Medicare patients and 166 services for Chelsea Xu. This counts Original Medicare only and measures volume, not quality.
- What is Chelsea Xu's NPI number?
- 1841797149. 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 Chelsea Xu, 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 | 90 |
|---|---|
| Services billed to Medicare | 166 |
| Different services or procedures | 16 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)41 services
- Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)30 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)28 services
- Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)14 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)13 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 cholesterol70%
- High blood pressure52%
- Arthritis33%
- Osteoporosis24%
- Diabetes20%
- Ischemic heart disease19%
Practice locations
Addresses where Chelsea Xu is enrolled with Medicare (CMS data updated October 2, 2026).
- 370 Distel CirLos Altos, CA 94022 (650) 254‑5200
- 795 El Camino RealPalo Alto, CA 94301 (415) 600‑1020
Group practices
Medicare enrollment lists Chelsea Xu as a member of this group (CMS data updated October 2, 2026).
- Sutter Bay Medical Foundation3,829 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Los Altos
Clinicians with the same Medicare primary specialty in Los Altos, CA — not a recommendation.
Other clinicians in Sutter Bay Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2018 (8 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) | 1841797149 |
| 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