Charlotte Koo, MD

Medicare activity in 2024

Official CMS public-use data for Charlotte Koo, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)208 services
2. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)131 services
3. Hospital discharge day management, more than 30 minutes (99239)129 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)49 services
5. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)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 blood pressure75%
• High cholesterol75%
• Arthritis51%
• Ischemic heart disease50%
• Chronic kidney disease46%
• Diabetes41%

Hospitals where Charlotte Koo works

Medicare's Facility Affiliation Data lists Charlotte Koo 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.

• Banner - University Medical Center PhoenixPhoenix, AZ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 030002
• Banner Baywood Medical CenterMesa, AZ · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 030088
• Banner Gateway Medical CenterGilbert, AZ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 030122
• Banner Heart HospitalMesa, AZ · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 030105
• Banner Ironwood Medical CenterQueen Creek, AZ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 030130

Practice locations

Addresses where Charlotte Koo is enrolled with Medicare (CMS data updated October 2, 2026).

• 1111 E McDowell RdPhoenix, AZ 85006 (602) 839‑2000
• 1900 N Higley RdGilbert, AZ 85234 (480) 453‑2034

Group practices

Medicare enrollment lists Charlotte Koo as a member of these groups (CMS data updated October 2, 2026).

• Banner Hospital Based Physicians Arizona LLC637 clinicians in the group
• Banner - University Hospital Based Physicians LLC339 clinicians in the group

Specialties

• Hospitalistprimary
• Internal Medicinealso

Find other Hospitalist doctors in Arizona →

Other hospitalists in Phoenix

Clinicians with the same Medicare primary specialty in Phoenix, AZ — not a recommendation.

• Deborah E. Fleming, MD
• Reina M. Patel, DO
• Fadi K. Alrabadi, MD
• Futoon Al Akili, MD
• Douglas Bosin, DO
• Victor N. Pham, MD
• Alec W. Stanke, DO
• Fadi Arodaki, DO

All hospitalists in Phoenix →

Other clinicians in Banner Hospital Based Physicians Arizona LLC

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

• Ijeoma N. Kalu, MD
• Brian Baird, DO
• Ming C. Hwang, DO
• Taylor A. Burton, DO
• Sarah Benberou, DO
• Glenn H. Allbritton, CNA

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