JAN K. SIEBERSMA M.D.
NPI 1952303216
Obstetrics & Gynecology in Lander, WY
About Jan K. Siebersma M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JAN K. SIEBERSMA M.D. (NPI 1952303216) is an individual obstetrics & gynecology provider in Lander, Wyoming, licensed in Wyoming (8076A) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, is affiliated with Sagewest Health Care, and is a graduate of University Of Iowa, Rj & L Carver College Of Medicine (1983).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 5
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
Jan K. Siebersma M.d. 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
4Medicare enrollment records show Jan Siebersma reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Lander, WY 82520
- Reassigned Medicare billing, Wyoming enrollment
- 13 clinicians in this Medicare group
Lander, WY 82520
- Reassigned Medicare billing, Wyoming enrollment
- 66 clinicians in this Medicare group
Worland, WY 82401
- Reassigned Medicare billing, Wyoming enrollment
- 28 clinicians in this Medicare group
Casper, WY 82601
- Reassigned Medicare billing, Wyoming 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 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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Sagewest Health Care
Acute Care Hospitals · Riverton, WYSt Johns Medical Center
Acute Care Hospitals · Jackson, WYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 82520 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
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 Jan Siebersma's NPI number?
The NPI number for Jan Siebersma is 1952303216. It was assigned to this individual provider in the NPPES registry on June 1, 2005.
Where is Jan Siebersma located?
Jan Siebersma practices at 745 Buena Vista Dr, Lander, WY 82520. The listed phone number is (307) 332-2941.
What is Jan Siebersma's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Jan Siebersma enrolled in Medicare?
Yes. Jan Siebersma 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 Jan Siebersma's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jan Siebersma reassigns Medicare benefits to 4 organizations: Lander Medical Clinic, PC (Lander, WY), Lander Valley Physician Practices, LLC (Lander, WY), Washakie Medical Center (Worland, WY) and Banner Health Physicians West LLC (Casper, 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 Jan Siebersma's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Jan Siebersma accept?
Health plans from Blue Cross Blue Shield of Wyoming, UnitedHealthcare and University of Utah Health Plans list Jan Siebersma 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 Jan Siebersma affiliated with any hospitals?
According to CMS data, Jan Siebersma is affiliated with Sagewest Health Care and St Johns Medical Center.
When was this NPI record last updated?
The NPPES record for Jan Siebersma was last updated on June 15, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.