Quick answers
- Does Mark R. Wieland accept Medicare assignment?
- Yes. Medicare's clinician data says Mark R. Wieland 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 Mark R. Wieland see?
- In 2024, CMS data shows 1,340 Original Medicare patients and 70,905 services for Mark R. Wieland. This counts Original Medicare only and measures volume, not quality.
- What is Mark R. Wieland's NPI number?
- 1134114382. 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 Mark R. Wieland, 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 | 1,340 |
|---|---|
| Services billed to Medicare | 70,905 |
| Different services or procedures | 33 |
| Participating Medicare provider | Yes |
| Average age of these patients | 79 |
Most frequent services
- Injection, faricimab-svoa, 0.1 mg (J2777)58,620 services
- Imaging of retina (92134)3,436 services
- Injection of drug into eye (67028)1,887 services
- Established patient problem focused exam of visual system (92012)1,620 services
- Injection, aflibercept, 1 mg (J0178)1,427 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 cholesterol75%
- High blood pressure71%
- Arthritis40%
- Ischemic heart disease28%
- Diabetes26%
- Chronic kidney disease22%
Practice locations
Addresses where Mark R. Wieland is enrolled with Medicare (CMS data updated October 2, 2026).
- 2495 Hospital Dr, Suite 545Mountain View, CA 94040 (650) 963‑3469
- 2512 Samaritan Ct, Suite PSan Jose, CA 95124 (408) 356‑8818
- 66 Bovet Rd, Suite 225San Mateo, CA 94402 (650) 340‑0111
- 798 Cass St, Suite 200Monterey, CA 93940 (831) 373‑6280
Group practices
Medicare enrollment lists Mark R. Wieland as a member of this group (CMS data updated October 2, 2026).
- Northern California Retina Vitreous Associates Medical Group, Inc.7 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Mountain View
Clinicians with the same Medicare primary specialty in Mountain View, CA — not a recommendation.
Other clinicians in Northern California Retina Vitreous Associates Medical Group, Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University |
| Graduation year | 1985 (41 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134114382 |
| 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