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Dr. Mark H. Takemura, MD

Gastroenterology (Gastroenterology Physician)

20911 Earl Street, Suite 280
Torrance, CA 90503

Who else practices at this address →

Los Angeles County includes primary care (7% of residents) and mental health (13% of residents) shortage areas. About shortage areas

Call (310) 214-7236

At a glance

In the NPI registry since
2006

Licensed in California since 1986, according to the Medical Board of California. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.

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

  • 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier

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

  • Gastroenterology Physician primary
    CA license G58448 (first issued 1986; current)

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

Map: Gastroenterology per capita by county →

Medicare patients and services

Most frequent Medicare services, 2023
ServiceTimesPatients
Established patient office or other outpatient visit, 20-29 minutes127118
Biopsy of large bowel using a flexible endoscope4545
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope4141
New patient office or other outpatient visit, 30-44 minutes3636
Colorectal cancer screening; colonoscopy on individual at high risk1717
Removal of polyps or growths of large bowel using an endoscope with mechanical snare1615

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.

Other Gastroenterology clinicians in Torrance

Sources

NPI registry (CMS NPPES, November 2026; record last updated April 20, 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 1487721189. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.