Quick answers
- Which hospitals does Mark Larson work at?
- Medicare's official clinician data lists Mark Larson at 1 hospital: Aurora St Lukes Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Larson see patients?
- Medicare's clinician data lists 2 practice locations, including Greenfield, WI and Cudahy, WI. Call before your visit to confirm the address.
- What is Mark Larson's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Mark Larson accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Larson accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark Larson?
- (414) 281-0424, as listed in official Medicare / NPI Registry data.
- What is Mark Larson's NPI number?
- 1831651868. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark Larson works
Medicare's Facility Affiliation Data lists Mark Larson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Aurora St Lukes Medical CenterMilwaukee, WI · Acute Care Hospital · CCN 520138
Practice locations
Addresses where Mark Larson is enrolled with Medicare (CMS data updated 2026-10-02).
- 4600 W Loomis Rd, Suite 310Greenfield, WI 53220 (414) 281‑0424
- 6020 S Packard AveCudahy, WI 53110 (414) 769‑6900
Group practices
Medicare enrollment lists Mark Larson as a member of this group (CMS data updated 2026-10-02).
- Ophthalmology Associates S C9 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Greenfield
Clinicians with the same Medicare primary specialty in Greenfield, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Sanford School Of Medicine Of University Of South Dakota |
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831651868 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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