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Dr. Christopher A. Fiack, M.D.

Pulmonology (Pulmonary Disease Physician)

  • Medicare participating

At a glance

Years since graduation
25
In the NPI registry since
2006
Medicare patients seen, 2024
45

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

  • 2001Medical school: University of Vermont 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

  • Pulmonary Disease Physician primary
    HI license MD14711
  • Critical Care Medicine (Internal Medicine) Physician
    HI license MD14711
  • Internal Medicine Physician
    HI license MD14711

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

Map: Pulmonology 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
45
Services billed
87
Patients’ average age
74
Most frequent Medicare services, 2023
ServiceTimesPatients
Established patient office or other outpatient visit, 30-39 minutes5426
Critical care, first 30-74 minutes1614

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

Most prescribed drugs, Medicare Part D 2024
DrugPrescriptions
Sildenafil Citrate
Other prescribers in Honolulu, HI
146
Opsumit (macitentan)121
Ambrisentan107
Tadalafil82
Tyvaso Dpi (treprostinil)45
Orenitram Er (treprostinil diolamine)32
Adempas (riociguat)23
Albuterol Sulfate Hfa (albuterol sulfate)
Other prescribers in Honolulu, HI
16

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

Other Pulmonology clinicians in Honolulu

Sources

NPI registry (CMS NPPES, November 2026; record last updated May 27, 2020), 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 1891716072. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.