Gerard L. Ohalloran, MD

Medicare activity in 2024

Official CMS public-use data for Gerard L. Ohalloran, 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. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)35 services
3. Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)29 services
4. Removal of impacted ear wax (69210)16 services
5. Sleep study including heart rate, breathing, airflow, and effort (95806)14 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 cholesterol69%
• High blood pressure62%
• Arthritis48%
• Anxiety22%
• Diabetes21%
• Ischemic heart disease18%

Hospitals where Gerard L. Ohalloran works

Medicare's Facility Affiliation Data lists Gerard L. Ohalloran 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.

• Abbott Northwestern HospitalMinneapolis, MN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 240057
• Northfield HospitalNorthfield, MN · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 240014

Practice locations

Addresses where Gerard L. Ohalloran is enrolled with Medicare (CMS data updated October 2, 2026).

• 2000 N AveNorthfield, MN 55057 (507) 646‑1478
• 9974 214th St WLakeville, MN 55044 (952) 469‑0500

Group practices

Medicare enrollment lists Gerard L. Ohalloran as a member of this group (CMS data updated October 2, 2026).

• Northfield Hospital121 clinicians in the group

Specialties

• Otolaryngologyprimary

Find other Otolaryngology doctors in Minnesota →

Other ENT doctors in Minnesota

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

• Nissim Khabie, MD
• Troy S. Hemme, DO
• Michael T. Hopfenspirger, MD
• Joshua J. Thom, MD
• John W. Meccia, MD
• Emiro E. Caicedo Granados, MD
• Majid Shafiei, MD
• Dev Amin, MD

All ENT doctors in Minnesota →

Other clinicians in Northfield Hospital

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

• Hailey J. Hinners
• Ingrid S. Hernberg, MD
• April L. Fitzloff, PA
• Donald A. Asmussen, MD
• Shannon T. Lau, MD
• Muna Alhusban

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