DR. CORI NICOLE WALKER MD
NPI 1972129542
Otolaryngology in Mason City, IA
About Dr. Cori Nicole Walker Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CORI NICOLE WALKER MD (NPI 1972129542) is an individual otolaryngology provider in Mason City, Iowa, licensed in Iowa (MD-54872) and active in the NPI registry since June 2020. She is enrolled in Medicare PECOS, is affiliated with Mercyone North Iowa Medical Center, and is a graduate of University Of Chicago, Pritzker School Of Medicine (2020).
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
Dr. Cori Nicole Walker Md 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
7Medicare enrollment records show Cori Walker reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Mason City, IA 50401
- Reassigned Medicare billing, Iowa enrollment
- 65 clinicians in this Medicare group
Mason City, IA 50401
- Reassigned Medicare billing, Iowa enrollment
- 420 clinicians in this Medicare group
Belmond, IA 50421
- Reassigned Medicare billing, Iowa enrollment
- Also billed through NPI 1821122623 (Iowa)
- 192 clinicians in this Medicare group
Clarion, IA 50525
- Reassigned Medicare billing, Iowa enrollment
- Also billed through NPI 1821045451 (Iowa)
- 166 clinicians in this Medicare group
Ackley, IA 50601
- Reassigned Medicare billing, Iowa enrollment
- Also billed through NPI 1831296052 (Iowa)
- 46 clinicians in this Medicare group
New Hampton, IA 50659
- Reassigned Medicare billing, Iowa enrollment
- Also billed through NPI 1770651515 (Iowa)
- 46 clinicians in this Medicare group
Johnston, IA 50131
- Reassigned Medicare billing, Iowa enrollment
- 1,506 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.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercyone North Iowa Medical Center
Acute Care Hospitals · Mason City, IAIowa Specialty Hospital - Belmond
Critical Access Hospitals · Belmond, IAMercy Medical Center-New Hampton
Critical Access Hospitals · New Hampton, IAHansen Family Hospital
Critical Access Hospitals · Iowa Falls, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 50401 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.
MASON CITY, IA 50401
MASON CITY, IA 50401
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 Cori Walker's NPI number?
The NPI number for Cori Walker is 1972129542. It was assigned to this individual provider in the NPPES registry on June 19, 2020.
Where is Cori Walker located?
Cori Walker practices at 250 S Crescent Dr, Mason City, IA 50401. The listed phone number is (641) 494-5380.
What is Cori Walker's specialty?
The primary specialty registered for this NPI is Otolaryngology with taxonomy code 207Y00000X.
Is Cori Walker enrolled in Medicare?
Yes. Cori Walker 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 Cori Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cori Walker reassigns Medicare benefits to 7 organizations: Mason City Clinic PC (Mason City, IA), North Iowa Mercy Clinics (Mason City, IA), Belmond Community Hospital (Belmond, IA), Iowa Specialty Hospital- Clarion (Clarion, IA), Ellsworth Municipal Hospital (Ackley, IA) and 2 more organizations, 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 Cori Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Cori Walker accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and Oscar Health and 2 other insurers list Cori Walker 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.
Is Cori Walker affiliated with any hospitals?
According to CMS data, Cori Walker is affiliated with Mercyone North Iowa Medical Center, Iowa Specialty Hospital - Belmond, Mercy Medical Center-New Hampton and Hansen Family Hospital.
When was this NPI record last updated?
The NPPES record for Cori Walker was last updated on August 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months 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.
# Dr. Cori Nicole Walker, MD · NPI 1972129542
Otolaryngology physician in Mason City, Iowa. Individual provider, active in the CMS NPPES registry since June 19, 2020.
## Identity
- **NPI:** 1972129542 (Entity type: Individual)
- **Enumerated:** June 19, 2020
- **Primary specialty:** Otolaryngology · taxonomy 207Y00000X
- **State license:** MD-54872 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 250 S CRESCENT DR, Mason City, IA 50401-2926
- **Phone:** (641) 494-5380 · **Fax:** (641) 494-5381
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Mason City Clinic PC (NPI 1043254055, Mason City, IA); North Iowa Mercy Clinics (NPI 1801147269, Mason City, IA); Belmond Community Hospital (NPI 1932142726, Belmond, IA); Iowa Specialty Hospital- Clarion (NPI 1396760153, Clarion, IA); Ellsworth Municipal Hospital (NPI 1356359061, Ackley, IA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Chicago, Pritzker School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** August 11, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1972129542) · Data from the CMS NPPES public registry.