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Dr. Mark C. Adrian, M.D.

Internal Medicine (Internal Medicine Physician)

9850 Genesee Ave, Suite 355
La Jolla, CA 92037

Who else practices at this address →

San Diego County includes primary care (1% of residents) and mental health (1% of residents) shortage areas. About shortage areas

Call (858) 202-0011

  • Medicare participating

At a glance

Years since graduation
34
In the NPI registry since
2006
Medicare patients seen, 2024
571

Licensed in California since 1994, 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

  • 1992Medical school: Rutgers R W Johnson Medical School (Cam/New Bruns/Pisc)
  • 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

  • Internal Medicine Physician primary
    CA license G78895 (first issued 1994; current)

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

Map: Internal Medicine 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
571
Services billed
951
Patients’ average age
78
Most frequent Medicare services, 2023
ServiceTimesPatients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes523499
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes402120
Hospital discharge day management, more than 30 minutes6865
Established patient office or other outpatient visit, 20-29 minutes1712

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 Internal Medicine clinicians in La Jolla

Sources

NPI registry (CMS NPPES, November 2026; record last updated September 21, 2010), 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 1003879438. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.