Johanna M. Missak, MD

Medicare activity in 2024

Official CMS public-use data for Johanna M. Missak, 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. Emergency department visit with moderate level of medical decision making (99284)42 services
2. Emergency department visit with high level of medical decision making (99285)36 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 pressure75%
• High cholesterol67%
• Diabetes66%
• Chronic kidney disease42%
• Heart failure39%
• Ischemic heart disease38%

Hospitals where Johanna M. Missak works

Medicare's Facility Affiliation Data lists Johanna M. Missak 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.

• Pine Ridge IHS HospitalPine Ridge, SD · Acute Care Hospital · Emergency services: listed by Medicare · CCN 430098

Practice locations

Addresses where Johanna M. Missak is enrolled with Medicare (CMS data updated October 2, 2026).

• East Hwy 18Pine Ridge, SD 57770 (605) 867‑3032
• PO Box 1201 E Hwy 18Pine Ridge, SD 57770

Group practices

Medicare enrollment lists Johanna M. Missak as a member of this group (CMS data updated October 2, 2026).

• Pine Ridge Indian Health Service Hospital108 clinicians in the group

Specialties

• Family Practiceprimary
• Emergency Medicinealso

Find other Family Practice doctors in South Dakota →

Other family doctors in South Dakota

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

• Arthur F. Wang, MD
• Benjamin D. Meyerink, MD
• Shakil I. Hafiz, DO
• Ryan J. Buse, MD
• Kimberly M. Kennedy, MD
• Thomas L. Heaton, DO
• John B. Jones, MD
• Victor C. Strasburg, MD

All family doctors in South Dakota →

Other clinicians in Pine Ridge Indian Health Service Hospital

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

• Osama K. Ghanem, MD
• Mark Krich, MD
• Sella N. Borgum, NP
• Michael Jones, MD
• Kayla D. Smith, MD
• John C. Mayberry, 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