Individual Healthcare Provider
Melissa N Loja, MD
Provider's NPPES record last updated: June 24, 2021
Overview
- Entity Type
- Individual Healthcare Provider
- NPI
- 1578826749
- Primary Specialty
- Surgery — Vascular Surgery
- Practice Location
- Fairfield, California
- Sole Proprietor
- Yes
Federal Screening
NPISignal checked this NPI against federal exclusion sources. Results below are based on the NPI number itself — an identifier match, not a name match.
List of Excluded Individuals/Entities (LEIE)
HHS Office of Inspector General
No potential match was identified in NPISignal's indexed List of Excluded Individuals/Entities (LEIE) records as of 2026-09-10.
- Source data
- September 10, 2026
- Records indexed
- 84,001
- Screened
- Sep 18, 2026, 1:18 PM UTC
This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.
SAM.gov Exclusions
U.S. General Services Administration
SAM.gov Exclusions was not checked.
SAM.gov screening is not configured on this deployment. No SAM check has been performed.
- Screened
- Not checked
This is an NPI-based check only. NPISignal does not publish name-based exclusion matches on a provider profile. A shared or similar name is a lead that requires human review, not an identification, and this page is not the place to make one. Run a name-based screening below to see potential matches with the reasons for each.
This reflects only the records NPISignal currently holds and the identity information supplied. It is not a verification of eligibility, licensure, or compliance. Verify decisions that matter against the authoritative source.
Searches OIG LEIE and SAM.gov by name and reviews every potential match.
Specialties & Taxonomies
- Primary
Surgery
Vascular Surgery
Allopathic & Osteopathic Physicians
A surgeon with expertise in the management of surgical disorders of the blood vessels, excluding the intracranial vessels or the heart.
Taxonomy code 2086S0129X
Provider-Reported License Information
- Surgery (California)
- A127991
Practice Locations
Practice Location
1860 Pennsylvania Ave Ste 120
Fairfield, California 94533-3550
Phone: (707) 646-4400
Additional Practice Location
6001 Norris Canyon Rd
San Ramon, California 94583-5400
Phone: (925) 275-9200
Additional Practice Location
2540 East St
Concord, California 94520-1906
Phone: (925) 682-8200
Additional Practice Location
1601 Ygnacio Valley Rd
Walnut Creek, California 94598-3122
Phone: (925) 939-3000
Additional Practice Location
1200 B Gale Wilson Blvd
Fairfield, California 94533-3552
Phone: (707) 646-5000
Additional Practice Location
1000 Nut Tree Rd
Vacaville, California 95687-4100
Phone: (707) 624-7000
Record Information
- Enumeration Date
- June 21, 2012
- Provider's NPPES Record Last Updated
- June 24, 2021
- Certification Date
- June 24, 2021
- NPISignal NPPES Dataset
- August 2026
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