Quick answers
- Where does Michael J. Onyon see patients?
- Medicare's clinician data lists 2 practice locations, including Merrimack, NH and Plaistow, NH. Call before your visit to confirm the address.
- What is Michael J. Onyon's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Michael J. Onyon accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Onyon 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 Michael J. Onyon?
- (603) 424-0404, as listed in official Medicare / NPI Registry data.
- What is Michael J. Onyon's NPI number?
- 1760434237. 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 Michael J. Onyon is enrolled with Medicare (CMS data updated 2026-10-02).
- 370 Daniel Webster HwyMerrimack, NH 03054 (603) 424‑0404
- 7 Plaistow Rd, Suite 1Plaistow, NH 03865 (603) 382‑1414
Group practices
Medicare enrollment lists Michael J. Onyon as a member of this group (CMS data updated 2026-10-02).
- Myeyedr Optometry of New Hampshire PLLC31 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Merrimack
Clinicians with the same Medicare primary specialty in Merrimack, NH — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | New England College Of Optometry |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1760434237 |
| 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