Humayun A. Khan, MD

Medicare activity in 2024

Official CMS public-use data for Humayun A. Khan, 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)186 services
2. Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes (99231)154 services
3. Hospital discharge day management, 30 minutes or less (99238)86 services
4. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)46 services
5. Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician (93016)43 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%
• Ischemic heart disease48%
• Chronic kidney disease46%
• Heart failure41%
• Arthritis39%

Hospitals where Humayun A. Khan works

Medicare's Facility Affiliation Data lists Humayun A. Khan 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.

• Marshfield Medical CenterMarshfield, WI · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 520037
• Marshfield Medical Center - Eau ClaireEau Claire, WI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 520210

Practice locations

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

• 1000 N Oak AveMarshfield, WI 54449 (715) 387‑5511
• 2310 Craig RdEau Claire, WI 54701 (715) 858‑8100

Group practices

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

• MCHS Hospitals Inc1,197 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in Wisconsin →

Other internal medicine doctors in Marshfield

Clinicians with the same Medicare primary specialty in Marshfield, WI — not a recommendation.

• Dharmesh Babaria, MD
• Seema Rahman, MD
• Kurtis J. Swanson, MD
• Analise J. Hanneman, MD
• Frederick B. Hernaez, MD
• Eram Rahim, MD
• Mark A. Richetto, MD
• Kristen M. Polga, MD

All internal medicine doctors in Marshfield →

Other clinicians in MCHS Hospitals Inc

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

• Dharmesh Babaria, MD
• Brandon L. Parkhurst, MD
• Rana M. Nasser, MD
• Carolyn C. McCarty, DO
• Thao H. Nguyen, NP
• Breanna L. Zimmermann, NP

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