Melissa Loja, MD
NPI 1578826749 · Vascular Surgery Physician · Fairfield, CA
Enrolled with Medicare as Practitioner - Vascular Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Melissa Loja, MD is a Vascular Surgery Physician provider in Fairfield, CA (NPI 1578826749).
Provider details
- NPI number
- 1578826749
- Entity type
- Individual
- Primary specialty
- Vascular Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- A127991 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
14 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
6 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,611 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. 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 .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 280 | $145 |
| Ultrasound Study of Arm and Leg Arteries93922 | 184 | $84 |
| Ultrasound of Both Sides of Head and Neck Blood Flow93880 | 181 | $233 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 153 | $40 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 115 | $184 |
| Ultrasound of Hemodialysis Access93990 | 110 | $160 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Clopidogrel Bisulfatebrand: Clopidogrel | 53 | 17 |
| Apixabanbrand: Eliquis | 40 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 27 | 21 |
| Atorvastatin Calcium | 14 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$41,526 across 41 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (5)
- 2540 East StConcord, CA 94520-1906Phone: (925) 682-8200
- 1200 B Gale Wilson BlvdFairfield, CA 94533-3552Phone: (707) 646-5000
- 6001 Norris Canyon RdSan Ramon, CA 94583-5400Phone: (925) 275-9200
- 1000 Nut Tree RdVacaville, CA 95687-4100Phone: (707) 624-7000
- 1601 Ygnacio Valley RdWalnut Creek, CA 94598-3122Phone: (925) 939-3000
Registry dates
- Enumerated
- 2012-06-21
- Last updated
- 2021-06-24
- Certified
- 2021-06-24
Frequently asked questions
- What is Melissa Loja's NPI number?
- Melissa Loja's National Provider Identifier (NPI) is 1578826749, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Melissa Loja's specialty?
- Melissa Loja is listed in the NPPES registry with a primary specialty of Vascular Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Melissa Loja located?
- Melissa Loja's practice location on file with NPPES is 1860 Pennsylvania Ave Ste 120, Fairfield, CA 94533-3550.
- What is Melissa Loja's phone number?
- The practice phone number listed in the NPPES registry for Melissa Loja is (707) 646-4400.
- Does Melissa Loja accept Medicare?
- Melissa Loja is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Melissa Loja's NPI active?
- Yes — Melissa Loja's NPI (1578826749) is active in the NPPES registry as of the last update on 2021-06-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.