Quick answers
- Where does Ray A. Lassen see patients?
- Medicare's clinician data lists 2 practice locations, including Doniphan, MO. Call before your visit to confirm the address.
- What is Ray A. Lassen's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Ray A. Lassen accept Medicare assignment?
- Yes. Medicare's clinician data says Ray A. Lassen 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 Ray A. Lassen?
- (573) 996-7529, as listed in official Medicare / NPI Registry data.
- What is Ray A. Lassen's NPI number?
- 1275523680. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Ray A. Lassen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Oak Tree Village, Suite 200Doniphan, MO 63935
- 1 Oak Tree Vlg, Suite 200Doniphan, MO 63935 (573) 996‑7529
Specialties
- Optometryprimary
Other optometrists in Missouri
Clinicians with the same Medicare primary specialty in Missouri — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | University Of Missouri St Louis - School Of Optometry |
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1275523680 |
| 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 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