Donald J. Greggain, MD

Medicare activity in 2024

Official CMS public-use data for Donald J. Greggain, 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)423 services
2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)353 services
3. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)273 services
4. Aspiration and/or injection of fluid from large joint (20610)17 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 pressure61%
• High cholesterol58%
• Arthritis38%
• Osteoporosis25%
• Diabetes21%
• Ischemic heart disease18%

Hospitals where Donald J. Greggain works

Medicare's Facility Affiliation Data lists Donald J. Greggain 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.

• St Joseph Regional Medical CenterLewiston, ID · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 130003
• Tri-State Memorial HospitalClarkston, WA · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 501332

Practice locations

Addresses where Donald J. Greggain is enrolled with Medicare (CMS data updated October 2, 2026).

• 2315 8th StLewiston, ID 83501 (208) 793‑5920
• 318 Warner DrLewiston, ID 83501 (208) 298‑1050
• 320 Warner DrLewiston, ID 83501 (208) 743‑3523
• 415 6th StLewiston, ID 83501
• 821 21st AveLewiston, ID 83501 (208) 799‑3422

Group practices

Medicare enrollment lists Donald J. Greggain as a member of this group (CMS data updated October 2, 2026).

• St Joseph Hospital LLC93 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in Idaho →

Other family doctors in Lewiston

Clinicians with the same Medicare primary specialty in Lewiston, ID — not a recommendation.

• Christopher J. Iacobelli, MD
• Kimberly M. Hassler, MD
• Kimberly J. Campbell, MD
• James F. Maguire, DO
• Zachary S. Ripley, DO
• Cheryl A. Mallory, MD

All family doctors in Lewiston →

Other clinicians in St Joseph Hospital LLC

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

• Amy D. Johnson, NP
• Kaden J. Thueson, PA
• John W. Ho, MD
• Bren Heaton, MD
• Lee Trotter, DO
• Steven R. Boyea, 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