MELISSA N LOJA MD
NPI 1578826749
Surgery - Vascular Surgery in Fairfield, CA

Q: What is Melissa Loja's NPI number?

The NPI number for Melissa Loja is 1578826749. It was assigned to this individual provider in the NPPES registry on June 21, 2012.

Q: What is Melissa Loja's specialty?

The primary specialty registered for this NPI is Surgery, specializing in Vascular Surgery, with taxonomy code 2086S0129X.

Q: When was this NPI record last updated?

The NPPES record for Melissa Loja was last updated on June 24, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since June 21, 2012PECOS EnrolledAccepts Medicare Assignment

1860 PENNSYLVANIA AVE STE 120, FAIRFIELD, CA 94533(707) 646-4400 Get Directions Write a Review

NPPES record last updated: June 24, 2021. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Jun 24, 2021, Apr 27, 2018 (2 updates tracked since 2018).

On this page

About Melissa N Loja Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MELISSA N LOJA MD (NPI 1578826749) is an individual vascular surgery provider in Fairfield, California, licensed in California (A127991) and active in the NPI registry since June 2012. She is enrolled in Medicare PECOS, maintains 5 additional practice locations, and is a graduate of University Of California, Davis School Of Medicine (2012).

NPPES Registry Identity

NPI1578826749

Entity TypeIndividualFemale

Primary Taxonomy2086S0129X

Provider Legal NameMELISSA N LOJACredential: MD

Location Address1860 PENNSYLVANIA AVE STE 120Fairfield, CA 94533-3550

Mailing Address1860 Pennsylvania Ave Ste 120Fairfield, CA 94533-3550 · (707) 646-4400 · Fax (707) 646-4461

Phone(707) 646-4400

Sole ProprietorYes

Medical School CMSUniversity Of California, Davis School Of MedicineGraduated 2012

Enumeration DateJune 21, 2012

Last NPPES UpdateJune 24, 20212 updates tracked since enumeration

NPPES CertifiedJune 24, 2021

✔ NPI 1578826749 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgery · Vascular SurgeryAllopathic & Osteopathic Physicians

Taxonomy Code2086S0129X

License✔ Licensed in CA · A127991

Definition

A surgeon with expertise in the management of surgical disorders of the blood vessels, excluding the intracranial vessels or the heart.

1860 PENNSYLVANIA AVE STE 120, Fairfield, CA 94533

Open in Google Maps ↗

Secondary Practice Locations 5

Location 16001 Norris Canyon RdSan Ramon, CA 94583-5400 · Phone (925) 275-9200

Location 22540 East StConcord, CA 94520-1906 · Phone (925) 682-8200

Location 31601 Ygnacio Valley RdWalnut Creek, CA 94598-3122 · Phone (925) 939-3000

Location 41200 B Gale Wilson BlvdFairfield, CA 94533-3552 · Phone (707) 646-5000

Location 51000 Nut Tree RdVacaville, CA 95687-4100 · Phone (707) 624-7000

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Melissa N Loja Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4486920600

PECOS Enrollment IDI20171016002476

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Melissa Loja reassigns Medicare billing to 9 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Northbay Healthcare Group

Same address

Addiction Medicine

1860 PENNSYLVANIA AVE STE 230
Fairfield, CA 94533

Reassigned Medicare billing, California enrollment
Medicare enrollment name: Northbay Physicians Surgery Center, LLC
516 clinicians in this Medicare group

NPI 1780736736 (707) 646-4370

Northbay Health Medical Foundation

5.2 mi

Internal Medicine

4500 BUSINESS CENTER DR
Fairfield, CA 94534

Reassigned Medicare billing, California enrollment
225 clinicians in this Medicare group

NPI 1760283527 (707) 646-3110

Northbay Physicians Surgery Center LLC

8.4 mi

Ambulatory Surgical

1006 NUT TREE ROAD
Vacaville, CA 95687

Reassigned Medicare billing, California enrollment
17 clinicians in this Medicare group

NPI 1003015843 (707) 446-2800

Providence Medical Foundation

14 mi

Obstetrics & Gynecology

1100 TRANCAS ST, SUITE 209
Napa, CA 94558

Reassigned Medicare billing, California enrollment
1,699 clinicians in this Medicare group

NPI 1205131950 (707) 251-1850

John Muir Physician Network

23 mi

General Practice

1450 TREAT BLVD, SUITE 300
Walnut Creek, CA 94597

Reassigned Medicare billing, California enrollment
650 clinicians in this Medicare group

NPI 1841407665 (925) 296-9872

John Muir Trauma Physicians Billing Service

24 mi

Trauma Surgery

1601 YGNACIO VALLEY RD
Walnut Creek, CA 94598

Reassigned Medicare billing, California enrollment
810 clinicians in this Medicare group

NPI 1962551861 (925) 947-5331

East Bay Cardiovascular And Thoracic Associates Inc.

33 mi

Surgery

1320 EL CAPITAN DR, STE 120
Danville, CA 94526

Reassigned Medicare billing, California enrollment
22 clinicians in this Medicare group

NPI 1073647202 (925) 676-2600

Diablo Podiatry

34 mi

Foot & Ankle Surgery

2301 CAMINO RAMON STE 290
San Ramon, CA 94583

Reassigned Medicare billing, California enrollment
3 clinicians in this Medicare group

NPI 1831770189 (925) 831-1898

County Of Monterey

103 mi

Family Medicine

17615 MORO RD
Prunedale, CA 93907

Reassigned Medicare billing, California enrollment
284 clinicians in this Medicare group

NPI 1063151363 (831) 663-3926

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 24

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

280 services194 patients

Ultrasound study of arm and leg arteries 93922

An ultrasound study of arm and leg arteries is a non-invasive procedure that uses sound waves to create images of your arteries. It helps in checking blood flow, identifying blockages, or detecting other abnormalities in your arteries.

184 services121 patients

Ultrasound of both sides of head and neck blood flow 93880

An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.

181 services133 patients

Telephone medical discussion with physician, 5-10 minutes 99441

A telephone medical discussion with a physician is a brief, 5-10 minute call where you can discuss your health concerns. It's a convenient way to receive medical advice without needing to visit a clinic. It's important to prepare questions in advance to make the most of this time.

153 services121 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

115 services115 patients

Ultrasound of hemodialysis access 93990

An ultrasound of hemodialysis access is a non-invasive procedure that uses sound waves to create images of your dialysis access site. It helps monitor the access site's health and detect any potential issues like blockages or narrowing.

110 services67 patients

Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes 99152

This procedure involves a doctor administering a medication to reduce your consciousness during a procedure. This helps in managing discomfort and anxiety. The initial application lasts for 15 minutes and is for individuals aged 5 years or older.

88 services60 patients

Ultrasound of leg arteries or artery grafts 93925

An ultrasound of leg arteries or artery grafts is a non-invasive imaging test. It uses high-frequency sound waves to capture live images from inside your body, specifically your leg arteries or grafts. This helps in detecting any blockages or abnormalities.

65 services44 patients

Ultrasound of aorta, vena cava, groin vessels or bypass grafts 93979

This procedure involves using sound waves to create images of your aorta, vena cava, groin vessels, or bypass grafts. It helps doctors check for issues like blockages or enlargements. It's non-invasive and painless.

56 services50 patients

Ultrasonic guidance for blood vessel access 76937

Ultrasonic guidance for blood vessel access is a medical procedure where sound waves are used to create images of your blood vessels. This helps doctors to accurately locate and access the vessels for treatments or tests, ensuring safety and precision.

49 services35 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

38 services35 patients

Ultrasound study of arm or leg veins with compression and maneuvers 93970

An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.

37 services35 patients

Insertion of needle and/or tube into hemodialysis circuit and balloon dilation of dialysis segment with review by radiologist 36902

This procedure involves inserting a needle or tube into your hemodialysis circuit, a system that cleans your blood when your kidneys can't. A balloon is then used to widen a narrow section of this circuit. A radiologist reviews the procedure to ensure accuracy.

36 services29 patients

Complete ultrasound of aorta, vena cava, groin vessels or bypass grafts 93978

This procedure involves using sound waves to create images of your aorta, vena cava, groin vessels, or bypass grafts. It helps to detect abnormalities or blockages, ensuring your blood flows smoothly. It's painless and non-invasive.

33 services28 patients

Ultrasound of one leg arteries or artery grafts 93926

An ultrasound of leg arteries or artery grafts is a non-invasive test using sound waves to create images of your blood vessels. This helps doctors assess blood flow, identify blockages, and monitor the health of grafts.

28 services22 patients

Telephone medical discussion with physician, 11-20 minutes 99442

This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.

27 services24 patients

Ultrasound study of one arm or leg veins with compression and maneuvers 93971

This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.

22 services17 patients

Review by radiologist of arm or leg artery image 75710

This procedure involves a radiologist examining images of your arm or leg arteries. These images are obtained through a non-invasive method, like an ultrasound or CT scan. The radiologist reviews these images to identify any abnormalities, such as blockages or narrowing, which can affect blood flow.

19 services15 patients

Measurement of brain wave activity (eeg) outside the brain during surgery 95955

An EEG (Electroencephalogram) during surgery monitors brain activity. Electrodes on the scalp record brain wave patterns, helping doctors ensure the brain is functioning normally throughout the procedure.

19 services16 patients

Complete ultrasound of artery and vein blood flow pre-op assessment on both sides of body for hemodialysis access 93985

This procedure involves using ultrasound technology to examine the blood flow in your arteries and veins on both sides of your body. It's crucial for preparing for hemodialysis access, ensuring safe and effective treatment.

17 services16 patients

Balloon dilation of dialysis segment with review by radiologist 36907

Balloon dilation of a dialysis segment is a procedure where a tiny balloon is inserted and inflated in a narrowed area of your dialysis access site, improving blood flow. A radiologist reviews images to ensure success.

14 services12 patients

Balloon dilation of artery of leg 37224

Balloon dilation of the leg artery is a procedure to improve blood flow. A tiny balloon is inserted into a narrowed artery, then inflated to widen the artery. This helps increase blood circulation to the leg. It's usually done under local anesthesia.

14 services12 patients

Removal of blood clot and portion of chest, neck, or brain artery 35301

This procedure involves the removal of a blood clot and a section of an artery in the chest, neck, or brain. It is often necessary to restore normal blood flow, prevent stroke, or alleviate symptoms related to the clot. The procedure is carried out by a skilled medical team.

13 services12 patients

Relocation of arm vein with connection to arm artery for hemodialysis 36821

This procedure involves moving a vein in your arm and connecting it to an artery. This creates a larger, stronger vein that can be used for hemodialysis, a treatment for kidney disease. It helps clean your blood when your kidneys can't.

13 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94533 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$98.85 typical visit price

range $65.02 – $191.95

Typical copayment $24.71 (range $16.25 – $47.98)

Most-billed visit code 99203

Established Patient

$80.24 typical visit price

range $21.86 – $157.69

Typical copayment $20.06 (range $5.46 – $39.42)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CYRUS R. MANCHERJE, M.D., INC.

Clinic/Center (Medical Specialty)

1860 PENNSYLVANIA AVE STE 120
FAIRFIELD, CA 94533

Solano County (707) 646-4400

AUSTIN RAY HOLDER

Physician Assistant (Surgical)

1860 PENNSYLVANIA AVE STE 120
FAIRFIELD, CA 94533

Solano County (707) 646-4370

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Melissa Loja's NPI number?

The NPI number for Melissa Loja is 1578826749. It was assigned to this individual provider in the NPPES registry on June 21, 2012.

Where is Melissa Loja located?

Melissa Loja practices at 1860 Pennsylvania Ave Ste 120, Fairfield, CA 94533. The listed phone number is (707) 646-4400.

What is Melissa Loja's specialty?

The primary specialty registered for this NPI is Surgery, specializing in Vascular Surgery, with taxonomy code 2086S0129X.

Is Melissa Loja enrolled in Medicare?

Yes. Melissa Loja is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Melissa Loja's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Melissa Loja reassigns Medicare benefits to 9 organizations: Northbay Healthcare Group (Fairfield, CA), Northbay Health Medical Foundation (Fairfield, CA), Northbay Physicians Surgery Center LLC (Vacaville, CA), Providence Medical Foundation (Napa, CA), John Muir Physician Network (Walnut Creek, CA) and 4 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Melissa Loja's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Melissa Loja was last updated on June 24, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.