Maryellen Shannon, MD
NPI 1033227483 · Obstetrics & Gynecology Physician · Irvine, CA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Maryellen Shannon, MD is a Obstetrics & Gynecology Physician provider in Irvine, CA (NPI 1033227483).
Provider details
- NPI number
- 1033227483
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- AZ19717 (AZ)
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
19 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
- 2006-08-27
- Last updated
- 2015-01-02
Frequently asked questions
- What is Maryellen Shannon's NPI number?
- Maryellen Shannon's National Provider Identifier (NPI) is 1033227483, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Maryellen Shannon's specialty?
- Maryellen Shannon is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Maryellen Shannon located?
- Maryellen Shannon's practice location on file with NPPES is 6 Hughes, Irvine, CA 92618-2059.
- What is Maryellen Shannon's phone number?
- The practice phone number listed in the NPPES registry for Maryellen Shannon is (949) 680-1880.
- Does Maryellen Shannon accept Medicare?
- Maryellen Shannon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Maryellen Shannon's NPI active?
- Yes — Maryellen Shannon's NPI (1033227483) is active in the NPPES registry as of the last update on 2015-01-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.