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Dr. Gregory P. Monohan, MD

Hematology (Hematology (Internal Medicine) Physician)

  • Medicare participating

At a glance

Years since graduation
26
In the NPI registry since
2006
Medicare patients seen, 2024
161

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. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is

Education and training

  • 2000Medical school: University of Kentucky College of Medicine
  • 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier

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

  • Hematology (Internal Medicine) Physician primary
    KY license 37946
  • Hematology & Oncology Physician
    KY license 37946
  • Internal Medicine Physician
    KY license 37946
  • Medical Oncology Physician
    KY license 37946

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

Map: Hematology 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
161
Services billed
491
Patients’ average age
72
Most frequent Medicare services, 2023
ServiceTimesPatients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes15641
Established patient office or other outpatient visit, 30-39 minutes13177
Established patient office or other outpatient visit, 40-54 minutes6440
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes2726
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes2118
New patient office or other outpatient visit, 45-59 minutes1717
New patient office or other outpatient visit, 60-74 minutes1313

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.

Industry-funded research

Named as a principal investigator on 2 industry-funded studies in 2025, from 2 companies. The companies reported $129,567 in research payments for these studies, mostly to the institutions running them.

From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.

Other Hematology clinicians in Lexington

Sources

NPI registry (CMS NPPES, November 2026; record last updated July 28, 2021), 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 1629184460. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.