Peter L. Karlsberg, MD

Medicare activity in 2024

Official CMS public-use data for Peter L. Karlsberg, 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. Aminolevulinic acid hcl for topical administration, 10% gel, 10 mg (J7345)5,402 services
2. Destruction of precancer skin growth, 2-14 growths (17003)2,635 services
3. Destruction of precancer skin growth, 1 growth (17000)985 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)756 services
5. Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)585 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 pressure66%
• Arthritis46%
• Ischemic heart disease22%
• Anxiety20%
• Chronic kidney disease20%

Hospitals where Peter L. Karlsberg works

Medicare's Facility Affiliation Data lists Peter L. Karlsberg 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.

• Community Memorial Hospital - VenturaVentura, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050394

Practice locations

Addresses where Peter L. Karlsberg is enrolled with Medicare (CMS data updated October 2, 2026).

• 1190 S Victoria Ave, Suite 300Ventura, CA 93003 (805) 677‑1600

Group practices

Medicare enrollment lists Peter L. Karlsberg as a member of this group (CMS data updated October 2, 2026).

• Peter L. Karlsberg, M.D. a Medical Corporation2 clinicians in the group

Specialties

• Dermatologyprimary

Find other Dermatology doctors in California →

Other dermatologists in Ventura

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

• Karin Eshagh, MD
• Robert R. Jordan, MD
• John H. Thacher, MD
• Grace S. Sun, MD
• Ryan D. Wells, MD
• Rikk N. Lynn, MD

All dermatologists in Ventura →

Other clinicians in Peter L. Karlsberg, M.D. a Medical Corporation

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

• Michele Ayans, PA

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