MARTIN JON WILLIAMSON OD
NPI 1740778646
Optometrist in La Crosse, WI
About Martin Jon Williamson Od NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARTIN JON WILLIAMSON OD (NPI 1740778646) is an individual optometrist in La Crosse, Wisconsin, licensed in Wisconsin (3509) and active in the NPI registry since April 2018. He is enrolled in Medicare PECOS and is a graduate of Other (2018).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Martin Jon Williamson Od is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show Martin Williamson reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
La Crosse, WI 54601
- Reassigned Medicare billing, Iowa and Wisconsin enrollments
- 179 clinicians in this Medicare group
La Crosse, WI 54601
- Reassigned Medicare billing, Wisconsin and Minnesota enrollments
- Also billed through NPI 1376593442 (Minnesota)
- 1,457 clinicians in this Medicare group
Blair, WI 54616
- Reassigned Medicare billing, Wisconsin enrollment
- 293 clinicians in this Medicare group
Hillsboro, WI 54634
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: St Josephs Health Services Inc
- 282 clinicians in this Medicare group
Boscobel, WI 53805
- Reassigned Medicare billing, Wisconsin enrollment
- 299 clinicians in this Medicare group
Friendship, WI 53934
- Reassigned Medicare billing, Wisconsin enrollment
- 280 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 8
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 54601 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LA CROSSE, WI 54601
LA CROSSE, WI 54601
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Martin Williamson's NPI number?
The NPI number for Martin Williamson is 1740778646. It was assigned to this individual provider in the NPPES registry on April 25, 2018.
Where is Martin Williamson located?
Martin Williamson practices at 1836 South Ave, La Crosse, WI 54601. The listed phone number is (608) 782-7300.
What is Martin Williamson's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Martin Williamson enrolled in Medicare?
Yes. Martin Williamson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Martin Williamson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Martin Williamson reassigns Medicare benefits to 6 organizations: Gundersen Clinic Ltd (La Crosse, WI), Gundersen Lutheran Medical Center, Inc (La Crosse, WI), Tri-County Memorial Hospital, Inc. (Blair, WI), St. Joseph's Health Services, Inc. (Hillsboro, WI), Memorial Hospital Of Boscobel (Boscobel, WI) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Martin Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Martin Williamson accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and Anthem Blue Cross and Blue Shield and 5 other insurers list Martin Williamson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Martin Williamson was last updated on August 31, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Martin Jon Williamson, OD · NPI 1740778646
Optometrist provider in La Crosse, Wisconsin. Individual provider, active in the CMS NPPES registry since April 25, 2018.
## Identity
- **NPI:** 1740778646 (Entity type: Individual)
- **Enumerated:** April 25, 2018
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 3509 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1836 SOUTH AVE, La Crosse, WI 54601
- **Phone:** (608) 782-7300
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Gundersen Clinic Ltd (NPI 1851343115, La Crosse, WI); Gundersen Lutheran Medical Center, Inc (NPI 1619210895, La Crosse, WI); Tri-County Memorial Hospital, Inc. (NPI 1659625192, Blair, WI); St. Joseph's Health Services, Inc. (NPI 1972591410, Hillsboro, WI); Memorial Hospital Of Boscobel (NPI 1306804794, Boscobel, WI); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2018
## Record status
- **NPPES last updated:** August 31, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1740778646) · Data from the CMS NPPES public registry.