IAN MATTHEW CHESLOCK
NPI 1003580762
Optometrist in Longview, WA
About Ian Matthew Cheslock NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IAN MATTHEW CHESLOCK (NPI 1003580762) is an individual optometrist in Longview, Washington, licensed in Washington (61169322) and active in the NPI registry since August 2021. He is enrolled in Medicare PECOS and is a graduate of Pacific University - College Of Optometry (2021).
NPPES Registry Identity
Specialties & Licenses
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
Ian Matthew Cheslock 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
3Medicare enrollment records show Ian Cheslock reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Longview, WA 98632
- Reassigned Medicare billing, Washington enrollment
- 4 clinicians in this Medicare group
Warm Springs, OR 97761
- Reassigned Medicare billing, Texas enrollment
- 22 clinicians in this Medicare group
Mescalero, NM 88340
- Reassigned Medicare billing, Texas enrollment
- 19 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 5
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 98632 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 8
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
LONGVIEW, WA 98632
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 Ian Cheslock's NPI number?
The NPI number for Ian Cheslock is 1003580762. It was assigned to this individual provider in the NPPES registry on August 5, 2021.
Where is Ian Cheslock located?
Ian Cheslock practices at 950 11th Ave, Longview, WA 98632. The listed phone number is (360) 577-1500.
What is Ian Cheslock's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Ian Cheslock enrolled in Medicare?
Yes. Ian Cheslock 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 Ian Cheslock's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ian Cheslock reassigns Medicare benefits to 3 organizations: Cascade Eye Care Ps (Longview, WA), Warm Springs Health And Wellness Dhhs Ihs Warm Springs Service Unit (Warm Springs, OR) and Mescalero Indian Hospital (Mescalero, NM). 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 Ian Cheslock's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Ian Cheslock was last updated on August 5, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Ian Matthew Cheslock · NPI 1003580762
Optometrist provider in Longview, Washington. Individual provider, active in the CMS NPPES registry since August 5, 2021.
## Identity
- **NPI:** 1003580762 (Entity type: Individual)
- **Enumerated:** August 5, 2021
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 61169322 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 950 11TH AVE, Longview, WA 98632-2504
- **Phone:** (360) 577-1500 · **Fax:** (360) 425-0735
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Cascade Eye Care Ps (NPI 1396815585, Longview, WA); Warm Springs Health And Wellness Dhhs Ihs Warm Springs Service Unit (NPI 1417084708, Warm Springs, OR); Mescalero Indian Hospital (NPI 1891886065, Mescalero, NM) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Pacific University - College Of Optometry, class of 2021
## Record status
- **NPPES last updated:** August 5, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1003580762) · Data from the CMS NPPES public registry.