Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Roy Opsahl, MD

Individual provider Anesthesiology Physician · NPI 1902987522

Roy Opsahl, MD practises Anesthesiology in Sonora, California. Graduated from Loma Linda University School of Medicine in 1993, 33 years ago. Practices with Sonora Anesthesia Services a Medical Group Inc, a 13-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Montana.

Years since qualifying
33
Trained at
Loma Linda University School of Medicine
Licensed in
CA, MT
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1000 Greenley Rd
Sonora, CA 95370-5200
Phone: (209) 536-3514
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1101 26th St S, Great Falls, MT 59405-5161 — (406) 455-5000

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence G70640 (CA)
Anesthesiology Physician Taxonomy 207L00000X · Licence 59579 (MT)

Record details

NPI number1902987522
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 18, 2006
Last updated in NPPESJanuary 17, 2025
Certification dateJanuary 17, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyANESTHESIOLOGY
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1993 (33 years in practice)
Group practice Sonora Anesthesia Services A Medical Group Inc — 13 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients181
Services billed 238 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Adventist Health Lodi Memorial Hospital · Lodi, CA

Colleagues at Sonora Anesthesia Services a Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 13 clinicians in the practice; 11 are shown here.

Other providers in Sonora