WILLIAM V IRBY DO
NPI 1902874779
Family Medicine in Hamilton, MO
About William V Irby Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM V IRBY DO (NPI 1902874779) is an individual family medicine provider in Hamilton, Missouri, licensed in Missouri (R3G66) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, is affiliated with Cameron Regional Medical Center, and maintains 11 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 11
Other Identifiers 1
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
William V Irby Do 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 Reassignment
Medicare enrollment records show William Irby reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Hamilton, MO 64644
- Reassigned Medicare billing, Missouri enrollment
- 23 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
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Cameron Regional Medical Center
Acute Care Hospitals · Cameron, MONew Liberty Hospital District
Acute Care Hospitals · Liberty, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 64644 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 9
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 William Irby's NPI number?
The NPI number for William Irby is 1902874779. It was assigned to this individual provider in the NPPES registry on March 9, 2006.
Where is William Irby located?
William Irby practices at 101 Cross St, Hamilton, MO 64644. The listed phone number is (816) 583-2151.
What is William Irby's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is William Irby enrolled in Medicare?
Yes. William Irby 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 organization bills Medicare for William Irby's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Irby reassigns Medicare benefits to Northwest Health Services, Inc. (Hamilton, MO). The 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 William Irby's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Irby accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 4 other insurers list William Irby 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 William Irby affiliated with any hospitals?
According to CMS data, William Irby is affiliated with Cameron Regional Medical Center and New Liberty Hospital District.
When was this NPI record last updated?
The NPPES record for William Irby was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# William V Irby, DO · NPI 1902874779
Family Medicine physician in Hamilton, Missouri. Individual provider, active in the CMS NPPES registry since March 9, 2006.
## Identity
- **NPI:** 1902874779 (Entity type: Individual)
- **Enumerated:** March 9, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** R3G66 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 CROSS ST, Hamilton, MO 64644-8311
- **Phone:** (816) 583-2151
## 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:** Northwest Health Services, Inc. (NPI 1841312444, Hamilton, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** R Franklin University Of Med & Sci/chicago Medical School, class of 1984
## Record status
- **NPPES last updated:** March 7, 2023
- **Other identifiers:** Medicaid 242356400 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1902874779) · Data from the CMS NPPES public registry.