DR. JONATHAN RANDALL WILLMS D.O.
NPI 1891010658
Obstetrics & Gynecology in Casa Grande, AZ
About Dr. Jonathan Randall Willms D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JONATHAN RANDALL WILLMS D.O. (NPI 1891010658) is an individual obstetrics & gynecology provider in Casa Grande, Arizona, licensed in Arizona (006349) and active in the NPI registry since April 2010. He is enrolled in Medicare PECOS, maintains a secondary practice location in Casa Grande, and is a graduate of Other (2010).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 6
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. Jonathan Randall Willms 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 Reassignments
2Medicare enrollment records show Jonathan Willms reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Casa Grande, AZ 85122
- Reassigned Medicare billing, Arizona enrollment
- 80 clinicians in this Medicare group
Chandler, AZ 85224
- Reassigned Medicare billing, Arizona enrollment
- Medicare enrollment name: Obhg Arizona PC
- 98 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 85122 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.
CASA GRANDE, AZ 85122
CASA GRANDE, AZ 85122
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 Jonathan Willms's NPI number?
The NPI number for Jonathan Willms is 1891010658. It was assigned to this individual provider in the NPPES registry on April 5, 2010.
Where is Jonathan Willms located?
Jonathan Willms practices at 1863 East Florence Blvd, Casa Grande, AZ 85122. The listed phone number is (520) 836-3446.
What is Jonathan Willms's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Jonathan Willms enrolled in Medicare?
Yes. Jonathan Willms 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 Jonathan Willms's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jonathan Willms reassigns Medicare benefits to 2 organizations: Sun Life Family Health Center Inc (Casa Grande, AZ) and Obhg Arizona, P.C. (Chandler, AZ). 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 Jonathan Willms's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Jonathan Willms accept?
Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Antidote Health Plan of Arizona, Inc., Blue Cross Blue Shield of Arizona and Cigna HealthCare of Arizona, Inc and 3 other insurers list Jonathan Willms 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 Jonathan Willms was last updated on August 21, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Jonathan Randall Willms, D.O. · NPI 1891010658
Obstetrics & Gynecology physician in Casa Grande, Arizona. Individual provider, active in the CMS NPPES registry since April 5, 2010.
## Identity
- **NPI:** 1891010658 (Entity type: Individual)
- **Enumerated:** April 5, 2010
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** 006349 (Arizona)
- **Sole proprietor:** No
## Practice location
- **Address:** 1863 EAST FLORENCE BLVD, Casa Grande, AZ 85122
- **Phone:** (520) 836-3446
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Sun Life Family Health Center Inc (NPI 1639831985, Casa Grande, AZ); Obhg Arizona, P.C. (NPI 1902188642, Chandler, AZ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2010
## Record status
- **NPPES last updated:** August 21, 2026
- **Other identifiers:** Other ZFQ31815 (AZ); Other Z165308 (AZ); Other 031815 (AZ); and 3 more
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Source: [NPI Profile](https://npiprofile.com/npi/1891010658) · Data from the CMS NPPES public registry.