Siamak Basiratmand, MD

Medicare activity in 2024

Official CMS public-use data for Siamak Basiratmand, 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 low level od decision making, if using time, 20 minutes or more (99213)313 services
2. Detection test by immunoassay technique for influenza virus (87400)19 services
3. Blood test, comprehensive group of blood chemicals (80053)17 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)16 services
5. Blood count, hemoglobin (85018)11 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 cholesterol75%
• High blood pressure73%
• Arthritis55%
• Diabetes36%
• Ischemic heart disease35%
• Anxiety26%

Hospitals where Siamak Basiratmand works

Medicare's Facility Affiliation Data lists Siamak Basiratmand 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.

• Lac/Olive View-Ucla Medical CenterSylmar, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050040

Practice locations

Addresses where Siamak Basiratmand is enrolled with Medicare (CMS data updated October 2, 2026).

• 100 Moody Ct, Suite 200Thousand Oaks, CA 91360 (805) 418‑3500
• 14445 Olive View DrSylmar, CA 91342
• 2020 Santa Monica Blvd, Suite 210Santa Monica, CA 90404 (310) 458‑2381
• 248 Hampshire Rd, Suite 100Thousand Oaks, CA 91361 (805) 370‑0040

Group practices

Medicare enrollment lists Siamak Basiratmand as a member of these groups (CMS data updated October 2, 2026).

• The Regents of the University of California1,462 clinicians in the group
• County of Los Angeles397 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in California →

Other internal medicine doctors in Thousand Oaks

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

• Kassra Poosti, MD
• Begum S. Sezer, MD
• Peter C. Lang, MD
• Niloufar Guiv, MD
• Sanjay M. Bhartia, MD
• Jose-Nitram P. Aliling, MD
• Diana Alavi, MD
• Steven McCarthy, MD

All internal medicine doctors in Thousand Oaks →

Other clinicians in The Regents of the University of California

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

• Caspian Oliai, MD
• Carolyn K. Kim, MD
• Dharushana Muthulingam, MD
• Anita Batra, MD
• Amin Motaref, MD
• Erika D. Romero-Gutierrez, 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