Margaret Shannon, M.D.
NPI 1265449441 · Dermatology Physician · Costa Mesa, CA
Enrolled with Medicare as Practitioner - Dermatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Shannon, M.D. is a Dermatology Physician provider in Costa Mesa, CA (NPI 1265449441).
Provider details
- NPI number
- 1265449441
- Entity type
- Individual
- Primary specialty
- Dermatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- 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 tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,982 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Destruction of Precancer Skin Growth, 2-14 Growths17003 | 2,885 | $7 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 740 | $92 |
| Destruction of Precancer Skin Growth, 1 Growth17000 | 641 | $59 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 499 | $36 |
| Biopsy of Related Skin Growth, First Growth11102 | 384 | $106 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Mupirocin | 89 | 70 |
| Triamcinolone Acetonide | 81 | 51 |
| Hydrocortisone | 42 | 27 |
| Clobetasol Propionate | 38 | 28 |
| Cephalexin | 37 | 33 |
| Valacyclovir Hclbrand: Valacyclovir | 32 | 20 |
| Metronidazole | 26 | 15 |
| Ketoconazole | 22 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$284 across 12 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-01
- Last updated
- 2010-08-05
Frequently asked questions
- What is Margaret Shannon's NPI number?
- Margaret Shannon's National Provider Identifier (NPI) is 1265449441, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Shannon's specialty?
- Margaret Shannon is listed in the NPPES registry with a primary specialty of Dermatology Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Shannon located?
- Margaret Shannon's practice location on file with NPPES is 275 Victoria St, Costa Mesa, CA 92627-1906.
- What is Margaret Shannon's phone number?
- The practice phone number listed in the NPPES registry for Margaret Shannon is (949) 646-2311.
- Does Margaret Shannon accept Medicare?
- Margaret Shannon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Shannon's NPI active?
- Yes — Margaret Shannon's NPI (1265449441) is active in the NPPES registry as of the last update on 2010-08-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.