Margaret M Shannon, MD, Inc
NPI 1326358052 · Dermatology Physician · Costa Mesa, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret M Shannon, MD, Inc is a Dermatology Physician organization in Costa Mesa, CA (NPI 1326358052).
Provider details
- NPI number
- 1326358052
- Entity type
- Organization
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Margaret Shannon, Owner(949) 646-2311
- License
- G42251 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-10-15
- Last updated
- 2010-11-02
Frequently asked questions
- What is Margaret M Shannon, MD, Inc's NPI number?
- Margaret M Shannon, MD, Inc's National Provider Identifier (NPI) is 1326358052, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Margaret M Shannon, MD, Inc?
- Margaret M Shannon, MD, Inc is classified in the NPPES registry as Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret M Shannon, MD, Inc located?
- Margaret M Shannon, MD, Inc's practice location on file with NPPES is 275 Victoria St Ste 1h, Costa Mesa, CA 92627-1906.
- What is Margaret M Shannon, MD, Inc's phone number?
- The practice phone number listed in the NPPES registry for Margaret M Shannon, MD, Inc is (949) 646-2311.
- Does Margaret M Shannon, MD, Inc accept Medicare?
- Margaret M Shannon, MD, Inc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Margaret M Shannon, MD, Inc?
- The authorized official listed on Margaret M Shannon, MD, Inc's NPPES record is Margaret Shannon, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Margaret M Shannon, MD, Inc's NPI active?
- Yes — Margaret M Shannon, MD, Inc's NPI (1326358052) is active in the NPPES registry as of the last update on 2010-11-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.