Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Nicholas S Muff, MD
Specialist in Corona, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1740372861
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Registry record
Entity type Individual (Type 1)
Name Nicholas S Muff
Credential MD
Sex Male
Practice address 260 E Ontario Ave Ste 101, Corona, CA, 92879
Phone (949) 490-4820
Fax (949) 490-4819
Enumeration date Sep 28, 2006
Last updated in NPPES Jun 13, 2025
Taxonomy & licenses
2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License G25544 (CA) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 05660 | Other | WA | REGENCE BS |
| 13895001 | Other | WA | GROUP HEALTH |
| 1160381 | Medicaid | WA | - |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Where does Nicholas Muff practice?
The practice location on file with NPPES is in Corona, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Nicholas Muff?
The National Provider Identifier (NPI) for Nicholas Muff is 1740372861, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-13.