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

Nicholas S Muff, MD

Individual provider Radiation Oncology Physician · NPI 1740372861

Nicholas S Muff, MD practises Radiation Oncology in Corona, California. Graduated from Loma Linda University School of Medicine in 1972, 54 years ago. Practices with Stephen William Doggett MD PA, a 5-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Washington.

Years since qualifying
54
Trained at
Loma Linda University School of Medicine
Licensed in
CA, WA
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

260 E Ontario Ave Ste 101
Corona, CA 92879-3508
Phone: (949) 490-4820
Fax: (949) 490-4819
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 2000 Hospital Drive, Sedro Woolley, WA 98284 — (360) 856-7270

Specialties & licences

Specialist (primary) Taxonomy 174400000X · Licence MD00015015 (WA)
Radiation Oncology Physician Taxonomy 2085R0001X · Licence G25544 (CA)

Record details

NPI number1740372861
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 28, 2006
Last updated in NPPESJune 13, 2025
Certification dateJune 13, 2025

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolLOMA LINDA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1972 (54 years in practice)
Group practice Stephen William Doggett Md Pa — 5 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 patients34
Services billed 133 a service is one billed item, such as a visit, a test or a procedure
Average patient age82

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.

Colleagues at Stephen William Doggett MD PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 5 clinicians in the practice; 3 are shown here.

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