JOHN WILLIAMS D.O.
NPI 1417334962
Anesthesiology in Des Moines, IA
About John Williams D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN WILLIAMS D.O. (NPI 1417334962) is an individual anesthesiology provider in Des Moines, Iowa, licensed in Iowa (DO-05325) and active in the NPI registry since May 2015. He is enrolled in Medicare PECOS, is affiliated with Unitypoint Health - Des Moines Iowa Methodist Medi, and maintains a secondary practice location in West Des Moines.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
John Williams 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 John Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Des Moines, IA 50309
- Reassigned Medicare billing, Iowa enrollment
- Medicare enrollment name: Associated Anesthesiologists PC
- 66 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 4
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Unitypoint Health - Des Moines Iowa Methodist Medi
Acute Care Hospitals · Des Moines, IAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
DES MOINES, IA 50309
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 John Williams's NPI number?
The NPI number for John Williams is 1417334962. It was assigned to this individual provider in the NPPES registry on May 5, 2015.
Where is John Williams located?
John Williams practices at 1200 Pleasant St, Des Moines, IA 50309. The listed phone number is (515) 241-6212.
What is John Williams's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is John Williams enrolled in Medicare?
Yes. John Williams 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 John Williams's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Williams reassigns Medicare benefits to Associated Anesthesiologists, P.C. (Des Moines, IA). 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 John Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is John Williams affiliated with any hospitals?
According to CMS data, John Williams is affiliated with Unitypoint Health - Des Moines Iowa Methodist Medi.
When was this NPI record last updated?
The NPPES record for John Williams was last updated on June 26, 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.
# John Williams, D.O. · NPI 1417334962
Anesthesiology physician in Des Moines, Iowa. Individual provider, active in the CMS NPPES registry since May 5, 2015.
## Identity
- **NPI:** 1417334962 (Entity type: Individual)
- **Enumerated:** May 5, 2015
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** DO-05325 (Iowa)
- **Sole proprietor:** No
## Practice location
- **Address:** 1200 PLEASANT ST, Des Moines, IA 50309-1406
- **Phone:** (515) 241-6212
## 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:** Associated Anesthesiologists, P.C. (NPI 1215904750, Des Moines, IA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Kansas City University Of Physicians And Surgeons, class of 2015
## Record status
- **NPPES last updated:** June 26, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1417334962) · Data from the CMS NPPES public registry.