WILLIAM CRAIG PALEY D.O.
NPI 1124105754
Family Medicine in Ontario, CA
About William Craig Paley D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM CRAIG PALEY D.O. (NPI 1124105754) is an individual family medicine provider in Ontario, California, licensed in Illinois (20A4932) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of Midwestern University, Chicago College Of Osteopathic Med (1981).
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
William Craig Paley D.o. 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 Paley reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Ontario, CA 91762
- Reassigned Medicare billing, California enrollment
- 119 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 2
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 91762 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 3
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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ONTARIO, CA 91762
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 Paley's NPI number?
The NPI number for William Paley is 1124105754. It was assigned to this individual provider in the NPPES registry on November 1, 2006.
Where is William Paley located?
William Paley practices at 437 N Euclid Ave, Ontario, CA 91762. The listed phone number is (909) 988-2555.
What is William Paley's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is William Paley enrolled in Medicare?
Yes. William Paley 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 Paley's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Paley reassigns Medicare benefits to Unicare Community Health Center, Inc. (Ontario, CA). 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 Paley'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 William Paley was last updated on February 27, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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 Craig Paley, D.O. · NPI 1124105754
Family Medicine physician in Ontario, California. Individual provider, active in the CMS NPPES registry since November 1, 2006.
## Identity
- **NPI:** 1124105754 (Entity type: Individual)
- **Enumerated:** November 1, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 20A4932 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 437 N EUCLID AVE, Ontario, CA 91762-3456
- **Phone:** (909) 988-2555 · **Fax:** (909) 988-4447
## 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:** Unicare Community Health Center, Inc. (NPI 1710309513, Ontario, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Midwestern University, Chicago College Of Osteopathic Med, class of 1981
## Record status
- **NPPES last updated:** February 27, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1124105754) · Data from the CMS NPPES public registry.