WILLIAM ALEXANDER CALDER MD
NPI 1275605412
Family Medicine in Arapahoe, WY
About William Alexander Calder Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM ALEXANDER CALDER MD (NPI 1275605412) is an individual family medicine provider in Arapahoe, Wyoming, licensed in Wyoming (4066A) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS.
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 (PECOS)
William Alexander Calder Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show William Calder reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Arapahoe, WY 82501
- Reassigned Medicare billing, Texas enrollment
- Medicare enrollment name: U S Health Dept Of Health & Human Services
- 306 clinicians in this Medicare group
Arapahoe, WY 82510
- Reassigned Medicare billing, Texas enrollment
- 57 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 82510 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.
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 Calder's NPI number?
The NPI number for William Calder is 1275605412. It was assigned to this individual provider in the NPPES registry on November 14, 2006.
Where is William Calder located?
William Calder practices at 14 Great Plains Rd, Arapahoe, WY 82510. The listed phone number is (307) 856-9281.
What is William Calder's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is William Calder enrolled in Medicare?
Yes. William Calder is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for William Calder's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Calder reassigns Medicare benefits to 2 organizations: Us Health Dept Of Health & Human Services (Arapahoe, WY) and Wind River Family & Community Healthc Care (Arapahoe, WY). 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 William Calder's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Calder accept?
Health plans from Blue Cross Blue Shield of Wyoming list William Calder 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 William Calder was last updated on November 17, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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 Alexander Calder, MD · NPI 1275605412
Family Medicine physician in Arapahoe, Wyoming. Individual provider, active in the CMS NPPES registry since November 14, 2006.
## Identity
- **NPI:** 1275605412 (Entity type: Individual)
- **Enumerated:** November 14, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 4066A (Wyoming)
- **Sole proprietor:** No
## Practice location
- **Address:** 14 GREAT PLAINS RD, Arapahoe, WY 82510
- **Phone:** (307) 856-9281
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for durable medical equipment, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Us Health Dept Of Health & Human Services (NPI 1104976372, Arapahoe, WY); Wind River Family & Community Healthc Care (NPI 1285006379, Arapahoe, WY) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** November 17, 2011
---
Source: [NPI Profile](https://npiprofile.com/npi/1275605412) · Data from the CMS NPPES public registry.