Anna N. Skay, MD

Medicare activity in 2024

Official CMS public-use data for Anna N. Skay, 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)228 services
2. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)112 services
3. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)102 services
4. New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)97 services
5. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)93 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 pressure69%
• Arthritis55%
• Ischemic heart disease38%
• Diabetes35%
• Anxiety26%

Hospitals where Anna N. Skay works

Medicare's Facility Affiliation Data lists Anna N. Skay 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.

• Ronald Reagan UCLA Medical CenterLos Angeles, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050262
• UCLA West Valley Medical CenterWest Hills, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050481

Practice locations

Addresses where Anna N. Skay is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.

• 100 Moody Ct, Suite 200Thousand Oaks, CA 91360 (805) 418‑3500
• 19950 Rinaldi StPorter Ranch, CA 91326
• 2020 Santa Monica Blvd, Suite 210Santa Monica, CA 90404 (310) 458‑2381
• 2755 Alamo St, Suite 100Simi Valley, CA 93065 (805) 526‑8252
• 7300 Medical Ctr DrWest Hills, CA 91307 (818) 676‑4000

Group practices

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

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

Specialties

• Gastroenterologyprimary
• Internal Medicinealso

Find other Gastroenterology doctors in California →

Other gastroenterologists in Thousand Oaks

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

• Rimma Shaposhnikov, MD
• Kumar S. Desai, MD
• Alister A. George, MD
• Ronald H. Omino, MD
• Shahram Daneshgar, MD
• Andrew M. Gregg
• Niharika R. Mallepally, MD
• Cristina S. Wiese, MD

All gastroenterologists 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.

• Jessica Wang, DO
• David Xu, MD
• Gwendolyn Lee, MD
• Su Hutchinson, MD
• Osei B. Boadu, MD
• Sarah R. Chou, NP

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