Quick answers
- Where does Margaret Shannon see patients?
- Medicare's clinician data lists 2 practice locations, including Costa Mesa, CA and Newport Beach, CA. Call before your visit to confirm the address.
- What is Margaret Shannon's specialty?
- Medicare lists Dermatology as the primary specialty.
- Does Margaret Shannon accept Medicare assignment?
- Yes. Medicare's clinician data says Margaret Shannon accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Margaret Shannon?
- (949) 646-2311, as listed in official Medicare / NPI Registry data.
- What is Margaret Shannon's NPI number?
- 1265449441. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Margaret Shannon is enrolled with Medicare (CMS data updated 2026-10-02).
- 275 Victoria St, 1hCosta Mesa, CA 92627
- 400 Newport Ctr Dr, Suite 501Newport Beach, CA 92660 (949) 646‑2311
Specialties
- Dermatologyprimary
Other dermatologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1979 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1265449441 |
| Corrections | Report an error or suggest an update → |
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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians