Karl J. Christoffersen, MD

Medicare activity in 2024

Official CMS public-use data for Karl J. Christoffersen, 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. Hyaluronan or derivative, synvisc or synvisc-one, for intra-articular injection, 1 mg (J7325)3,128 services
2. Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)2,572 services
3. Aspiration and/or injection of fluid from large joint (20610)323 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)314 services
5. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)208 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).

• Arthritis75%
• High cholesterol70%
• High blood pressure65%
• Osteoporosis24%
• Anxiety21%
• Ischemic heart disease20%

Hospitals where Karl J. Christoffersen works

Medicare's Facility Affiliation Data lists Karl J. Christoffersen 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.

• Dominican HospitalSanta Cruz, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050242
• Sutter Maternity & Surgery Center of Santa CruzSanta Cruz, CA · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 050714

Practice locations

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

• 2900 Chanticleer AveSanta Cruz, CA 95065
• 2907 Chanticleer AveSanta Cruz, CA 95065 (831) 477‑2375
• 2911 Chanticleer AveSanta Cruz, CA 95065 (831) 477‑2350
• 2915 Chanticleer AveSanta Cruz, CA 95065 (831) 477‑2375
• 550 S Green Valley RdWatsonville, CA 95076 (831) 458‑5865

Group practices

Medicare enrollment lists Karl J. Christoffersen as a member of this group (CMS data updated October 2, 2026).

• Sutter Bay Medical Foundation3,829 clinicians in the group

Specialties

• Orthopedic Surgeryprimary

Find other Orthopedic Surgery doctors in California →

Other orthopedic surgeons in Santa Cruz

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

• Stefan F. Klein, MD
• Eric Hohn, MD
• James D. Spiegel, MD
• Neil M. Richman, MD

All orthopedic surgeons in Santa Cruz →

Other clinicians in Sutter Bay Medical Foundation

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

• Santosh S. Oommen, MD
• Michael K. Hung, MD
• Xiaoran Zhang, MD
• Joseph F. Walter Jr., MD
• Jerry A. Peer, MD
• Alexander Goel, 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