Deirdre Lyell, MD
NPI 1821130865 · Maternal & Fetal Medicine Physician · Palo Alto, CA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Deirdre Lyell, MD is a Maternal & Fetal Medicine Physician provider in Palo Alto, CA (NPI 1821130865).
Provider details
- NPI number
- 1821130865
- Entity type
- Individual
- Primary specialty
- Maternal & Fetal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A72758 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
2 documented practice locations
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
Additional practice locations (1)
- 300 Pasteur DrStanford, CA 94305-2200Phone: (650) 498-5391
Registry dates
- Enumerated
- 2007-02-13
- Last updated
- 2024-04-26
- Certified
- 2024-04-26
Frequently asked questions
- What is Deirdre Lyell's NPI number?
- Deirdre Lyell's National Provider Identifier (NPI) is 1821130865, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Deirdre Lyell's specialty?
- Deirdre Lyell is listed in the NPPES registry with a primary specialty of Maternal & Fetal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Deirdre Lyell located?
- Deirdre Lyell's practice location on file with NPPES is 725 Welch Rd, Palo Alto, CA 94304-1601.
- What is Deirdre Lyell's phone number?
- The practice phone number listed in the NPPES registry for Deirdre Lyell is (650) 497-8000.
- Does Deirdre Lyell accept Medicare?
- Deirdre Lyell is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Deirdre Lyell's NPI active?
- Yes — Deirdre Lyell's NPI (1821130865) is active in the NPPES registry as of the last update on 2024-04-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.