Clair Segui, M.D.
NPI 1811939598 · Family Medicine Physician · Union City, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Clair Segui, M.D. is a Family Medicine Physician provider in Union City, CA (NPI 1811939598).
Provider details
- NPI number
- 1811939598
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A84991 (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
20 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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 98 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 518 | 198 |
| Losartan Potassium | 336 | 132 |
| Amlodipine Besylate | 334 | 121 |
| Atenolol | 226 | 92 |
| Metformin Hclbrand: Metformin Hcl Er | 221 | 77 |
| Lisinopril | 158 | 68 |
| Simvastatin | 152 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-10
- Last updated
- 2021-12-14
Frequently asked questions
- What is Clair Segui's NPI number?
- Clair Segui's National Provider Identifier (NPI) is 1811939598, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Clair Segui's specialty?
- Clair Segui is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Clair Segui located?
- Clair Segui's practice location on file with NPPES is 3553 Whipple Rd, Union City, CA 94587-1507.
- What is Clair Segui's phone number?
- The practice phone number listed in the NPPES registry for Clair Segui is (510) 454-1000.
- Does Clair Segui accept Medicare?
- Clair Segui is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Clair Segui's NPI active?
- Yes — Clair Segui's NPI (1811939598) is active in the NPPES registry as of the last update on 2021-12-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.