Gregory A. Christiansen, MD

Medicare activity in 2024

Official CMS public-use data for Gregory A. Christiansen, 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 moderate level of decision making, if using time, 30 minutes or more (99214)1,164 services
2. Exam of visual field with extended testing (92083)1,156 services
3. Imaging of optic nerve (92133)1,069 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)678 services
5. Measurement of corneal curvature and depth of eye (92136)549 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 cholesterol72%
• High blood pressure69%
• Arthritis36%
• Diabetes27%
• Chronic kidney disease23%
• Ischemic heart disease20%

Hospitals where Gregory A. Christiansen works

Medicare's Facility Affiliation Data lists Gregory A. Christiansen 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.

• UnityPoint Health - MarshalltownMarshalltown, IA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 160001

Practice locations

Addresses where Gregory A. Christiansen is enrolled with Medicare (CMS data updated October 2, 2026).

• 309 E Church StMarshalltown, IA 50158 (641) 754‑6200
• 6100 Westown Pkwy, Suite 200West Des Moines, IA 50266 (515) 223‑8685
• 6200 Westown Pkwy, Wolfe Eye ClinicWest Des Moines, IA 50266 (515) 223‑8685
• 800 E 1st St, 2500 Wolfe Clinic PC AnkenyAnkeny, IA 50021 (515) 676‑7014

Group practices

Medicare enrollment lists Gregory A. Christiansen as a member of this group (CMS data updated October 2, 2026).

• Wolfe Clinic Inc39 clinicians in the group

Specialties

• Ophthalmologyprimary

Find other Ophthalmology doctors in Iowa →

Other ophthalmologists in Iowa

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

• Micaela M. Koci, MD
• David D. Saggau, MD
• Alina V. Dumitrescu, MD
• Mark D. Reynolds, MD
• Brian K. Privett, MD
• Allie M. Simpson, MD
• Libing K. Dong, MD
• Tania E. Padilla Conde, MD

All ophthalmologists in Iowa →

Other clinicians in Wolfe Clinic Inc

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

• Allie M. Simpson, MD
• Benjamin L. Mason, MD
• Robert P. Moreland, OD
• Kyle J. Alliman, MD
• Samuel A. Whittier, MD
• Cory A. Christensen

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