Quick answers
- Does Alois Zauner accept Medicare assignment?
- Yes. Medicare's clinician data says Alois Zauner 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 Alois Zauner see?
- In 2024, CMS data shows 69 Original Medicare patients and 229 services for Alois Zauner. This counts Original Medicare only and measures volume, not quality.
- What is Alois Zauner's NPI number?
- 1922023720. 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 Alois Zauner, 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 | 69 |
|---|---|
| Services billed to Medicare | 229 |
| Different services or procedures | 33 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)40 services
- Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)33 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)21 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)14 services
- Insertion of tube into brain artery for diagnosis or treatment with review by radiologist (36226)12 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%
- Stroke or mini-stroke61%
- Arthritis54%
- Diabetes43%
- Ischemic heart disease42%
Hospitals where Alois Zauner works
Medicare's Facility Affiliation Data lists Alois Zauner 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.
- Scripps Mercy HospitalSan Diego, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050077
- Sharp Chula Vista Medical CenterChula Vista, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050222
Practice locations
Addresses where Alois Zauner is enrolled with Medicare (CMS data updated October 2, 2026).
- 4060 4th Ave, Suite 508San Diego, CA 92103 (619) 684‑7085
- 4077 5th AveSan Diego, CA 92103 (619) 359‑6600
- 435 H StChula Vista, CA 91910 (619) 359‑6600
Group practices
Medicare enrollment lists Alois Zauner as a member of this group (CMS data updated October 2, 2026).
- On Call Specialists Medical Group of San Diego Inc144 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in San Diego
Clinicians with the same Medicare primary specialty in San Diego, CA — not a recommendation.
Other clinicians in On Call Specialists Medical Group of San Diego Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 (38 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922023720 |
| 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