Warren M. Allen, MD

Medicare activity in 2024

Official CMS public-use data for Warren M. Allen, 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. Pathology examination of tissue using a microscope, intermediate complexity (88305)792 services
2. Special stained specimen slides to examine tissue, each additional procedure (88341)183 services
3. Pathology examination of tissue using a microscope, moderately high complexity (88307)174 services
4. Special stained specimen slides to examine tissue, initial procedure (88342)105 services
5. Cell examination of specimen, selective cellular enhancement technique (88112)97 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 pressure74%
• Arthritis55%
• Ischemic heart disease42%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)41%
• Diabetes25%

Hospitals where Warren M. Allen works

Medicare's Facility Affiliation Data lists Warren M. Allen 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.

• Cedars-Sinai Medical CenterLos Angeles, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050625
• Saint John's Health CenterSanta Monica, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050290

Practice locations

Addresses where Warren M. Allen is enrolled with Medicare (CMS data updated October 2, 2026).

• 2121 Santa Monica BlvdSanta Monica, CA 90404 (310) 829‑8101

Group practices

Medicare enrollment lists Warren M. Allen as a member of this group (CMS data updated October 2, 2026).

• Pathology Medical Group of Saint Johns8 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in California →

Other pathologists in Santa Monica

Clinicians with the same Medicare primary specialty in Santa Monica, CA — not a recommendation.

• Rae A. Joselson, MD
• Yalda B. Naeini, MD
• Nathalie F. Orloff, MD
• David L. Krasne, MD
• Michael C. Fishbein, MD
• Sun Mi Choi, MD
• Andrea Krajisnik, MD
• Michael S. Lewis, MD

All pathologists in Santa Monica →

Other clinicians in Pathology Medical Group of Saint Johns

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

• Rae A. Joselson, MD
• Yalda B. Naeini, MD
• Nathalie F. Orloff, MD
• Andrea Krajisnik, MD
• David L. Krasne, MD
• Yuki Takasumi, 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