Michael N. Papanicolaou, MD

Medicare activity in 2024

Official CMS public-use data for Michael N. Papanicolaou, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)2,099 services
2. Injection, regadenoson, 0.1 mg (J2785)1,736 services
3. Rubidium rb-82, diagnostic, per study dose, up to 60 millicuries (A9555)846 services
4. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)722 services
5. Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision and review by physician (93015)496 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Arthritis55%
• Ischemic heart disease52%
• Atrial fibrillation35%
• Chronic kidney disease31%

Hospitals where Michael N. Papanicolaou works

Medicare's Facility Affiliation Data lists Michael N. Papanicolaou at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Los Robles Hospital & Medical CenterThousand Oaks, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050549
• Northridge Hospital Medical CenterNorthridge, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050116
• Providence Cedars Sinai Tarzana Medical CenterTarzana, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050761

Practice locations

Addresses where Michael N. Papanicolaou is enrolled with Medicare (CMS data updated October 2, 2026).

• 1000 Newbury Rd, Suite 180Thousand Oaks, CA 91320 (805) 480‑2600

Group practices

Medicare enrollment lists Michael N. Papanicolaou as a member of this group (CMS data updated October 2, 2026).

• Heart Center Cardiology2 clinicians in the group

Specialties

• Cardiovascular Disease (Cardiology)primary
• Internal Medicinealso

Find other Cardiovascular Disease (Cardiology) doctors in California →

Other cardiologists in Thousand Oaks

Clinicians with the same Medicare primary specialty in Thousand Oaks, CA — not a recommendation.

• Christopher M. Purmer, MD
• Peyman Nejatbakhsh Azadani, MD
• Happy D. Thakkar, MD
• Ashraf N. Nashed, MD
• Jay M. Patel, MD
• David G. Aliabadi, MD
• James Modlinger, MD
• Leili Pourafkari, MD

All cardiologists in Thousand Oaks →

Other clinicians in Heart Center Cardiology

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Christopher M. Purmer, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians