Quick answers
- Does Walter L. Li accept Medicare assignment?
- Yes. Medicare's clinician data says Walter L. Li 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 Walter L. Li see?
- In 2024, CMS data shows 23 Original Medicare patients and 43 services for Walter L. Li. This counts Original Medicare only and measures volume, not quality.
- What is Walter L. Li's NPI number?
- 1588866578. 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 Walter L. Li, 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 | 23 |
|---|---|
| Services billed to Medicare | 43 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 46 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)19 services
Practice locations
Addresses where Walter L. Li is enrolled with Medicare (CMS data updated October 2, 2026).
- 400 Parnassus AveSan Francisco, CA 94143
- 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000
Group practices
Medicare enrollment lists Walter L. Li as a member of these groups (CMS data updated October 2, 2026).
- UCSF Medical Group Business Services1,598 clinicians in the group
- UCSF Pediatrics Associates92 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Other clinicians in UCSF Medical Group Business Services
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2005 (21 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588866578 |
| 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