Jan K. Siebersma, MD

Medicare activity in 2024

Official CMS public-use data for Jan K. Siebersma, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)67 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)44 services
3. Manual urinalysis test with examination using microscope, automated (81001)16 services
4. Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina (76830)12 services
5. Pelvic exam (99459)12 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure55%
• Arthritis44%
• High cholesterol37%
• Depression23%
• Anxiety22%
• Ischemic heart disease18%

Hospitals where Jan K. Siebersma works

Medicare's Facility Affiliation Data lists Jan K. Siebersma at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Sagewest Health CareRiverton, WY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 530008
• St Johns Medical CenterJackson, WY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 530015

Practice locations

Addresses where Jan K. Siebersma is enrolled with Medicare (CMS data updated October 2, 2026).

• 219 S 2nd St WRiverton, WY 82501 (307) 856‑6591
• 745 Buena Vista DrLander, WY 82520 (307) 332‑2941

Group practices

Medicare enrollment lists Jan K. Siebersma as a member of this group (CMS data updated October 2, 2026).

• Lander Medical Clinic PC18 clinicians in the group

Specialties

• Obstetrics/Gynecologyprimary

Find other Obstetrics/Gynecology doctors in Wyoming →

Other OB-GYNs in Wyoming

Clinicians with the same Medicare primary specialty in Wyoming — not a recommendation.

• Eric C. Hansen, MD
• Austin L. Barnes, MD
• Elisabeth M. Scalva, MD
• Natalie B. Eggleston, MD
• Derek A. Ewell, DO
• Amy M. Adelberg, MD
• Megan S. Varvoutis, MD
• Megan E. Looby, DO

All OB-GYNs in Wyoming →

Other clinicians in Lander Medical Clinic PC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Kacie M. Gallo, MD
• Broc White, MD
• Haley N. Mortin, PA
• Steven J. Platz, PA
• Kristine M. Cardinal, NP
• Thomas R. Rangitsch, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians