Grace Lozinski, M.D.
NPI 1659399582 · Internal Medicine Physician · Irvine, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Grace Lozinski, M.D. is a Internal Medicine Physician provider in Irvine, CA (NPI 1659399582).
Provider details
- NPI number
- 1659399582
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A77966 (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
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
- 2006-07-18
- Last updated
- 2026-03-03
- Certified
- 2026-03-03
Frequently asked questions
- What is Grace Lozinski's NPI number?
- Grace Lozinski's National Provider Identifier (NPI) is 1659399582, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Grace Lozinski's specialty?
- Grace Lozinski is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Grace Lozinski located?
- Grace Lozinski's practice location on file with NPPES is 4950 Barranca Pkwy Ste 207, Irvine, CA 92604-8648.
- What is Grace Lozinski's phone number?
- The practice phone number listed in the NPPES registry for Grace Lozinski is (949) 262-9700.
- Does Grace Lozinski accept Medicare?
- Grace Lozinski is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Grace Lozinski's NPI active?
- Yes — Grace Lozinski's NPI (1659399582) is active in the NPPES registry as of the last update on 2026-03-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.