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Dr. Michael J. Hendrix, MD

Infectious Disease (Infectious Disease Physician)

  • Medicare participating

At a glance

Years since graduation
11
In the NPI registry since
2015
Medicare patients seen, 2024
167

The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is

Education and training

  • 2015Registered with an NPI (national billing number; not a license date)

Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).

Specialties and state licenses

  • Infectious Disease Physician primary
    MO license 2019036769
  • Internal Medicine Physician
    MO license 2019036769

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Infectious Disease per capita by county →

Where they work

Hospitals

Medical groups

Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.

Medicare patients and services

Medicare patients, 2024
167
Services billed
736
Patients’ average age
70
Most frequent Medicare services, 2023
ServiceTimesPatients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes6749
Established patient office or other outpatient visit, 30-39 minutes6451
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes5349
Established patient office or other outpatient visit, 20-29 minutes5035
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes4841
New patient office or other outpatient visit, 45-59 minutes2626
New patient office or other outpatient visit, 60-74 minutes1818
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes1715
Established patient office or other outpatient visit, 40-54 minutes1717

Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.

Medicare prescriptions

Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.

Other Infectious Disease clinicians in Saint Louis

Sources

NPI registry (CMS NPPES, November 2026; record last updated May 12, 2026), Medicare Care Compare, Medicare Physician & Other Practitioners (2024), Medicare Part D Prescribers (2024) and Open Payments (2025). Information is self-reported or billed data and may be out of date; call before visiting.

NPI 1881076503. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.