DR. ALEXANDRA HERRERO LEON GUERRERO M.D.
NPI 1780020586
Surgery in Tamuning, GU

Q: What is Alexandra Leon Guerrero's NPI number?

The NPI number for Alexandra Leon Guerrero is 1780020586. It was assigned to this individual provider in the NPPES registry on May 20, 2013.

Q: What is Alexandra Leon Guerrero's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Active since May 20, 2013PECOS EnrolledAccepts Medicare Assignment

280 PALE SAN VITORES RD, TAMUNING, GU 96913(671) 647-4542(671) 647-4558 Get Directions Write a Review

NPPES record last updated: August 27, 2019. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Dr. Alexandra Herrero Leon Guerrero M.d. NPPES

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

DR. ALEXANDRA HERRERO LEON GUERRERO M.D. (NPI 1780020586) is an individual surgery provider in Tamuning, Guam, licensed in Guam (M-2170) and active in the NPI registry since May 2013. She is enrolled in Medicare PECOS, is affiliated with Guam Memorial Hospital Authority, and maintains a secondary practice location in New York.

NPPES Registry Identity

NPI1780020586

Entity TypeIndividualFemale

Primary Taxonomy208600000X

Provider Legal NameDR. ALEXANDRA HERRERO LEON GUERREROCredential: M.D.

Location Address280 PALE SAN VITORES RDTamuning, GU 96913-3615

Mailing Address10 W Anaco LnPiti, GU 96915-5412 · (650) 804-6818

Phone(671) 647-4542

Fax(671) 647-4558

Sole ProprietorNo

Medical School CMSNew York University School Of MedicineGraduated 2013

Enumeration DateMay 20, 2013

Last NPPES UpdateAugust 27, 2019

✔ NPI 1780020586 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtySurgeryAllopathic & Osteopathic Physicians

Taxonomy Code208600000X

License✔ Licensed in GU · M-2170

Definition

A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.

Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X

Secondary Practice Location 1

Location 1550 1st AveNew York, NY 10016-6402 · Phone (212) 263-5506

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

Dr. Alexandra Herrero Leon Guerrero M.d. 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 ID547693566

PECOS Enrollment IDI20200110001936

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 Alexandra Leon Guerrero reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Guam Healthcare Development Incorporated

Clinic/Center

133 ROUTE 3
Dededo, GU 96929

Reassigned Medicare billing, Guam enrollment
432 clinicians in this Medicare group

NPI 1326447939 (671) 645-5500

Hafa Specialist Group LLP

Specialist

280 PALE SAN VITORES RD
Tamuning, GU 96913

Reassigned Medicare billing, Guam enrollment
20 clinicians in this Medicare group

NPI 1235141060 (671) 647-4542

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 5

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 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.

117 services97 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.

49 services49 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

35 services34 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

33 services32 patients

Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk G0121

Colorectal cancer screening, such as a colonoscopy, is a preventive measure to detect early signs of cancer in the large intestine. For individuals not at high risk, it's typically recommended at age 50. A small, flexible tube with a camera is used to examine your colon. It's a safe, effective way to catch issues early.

18 services18 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Guam Memorial Hospital Authority

Acute Care Hospitals · Tamuning, GU

2/5 CMS rating

OwnershipGovernment - Local

CMS Certification Number650001

Location85O Gov Carlos G Camacho RoadTamuning, GU 96913 · Guam County

Emergency services

Guam Regional Medical City

Acute Care Hospitals · Dededo, GU

OwnershipVoluntary non-profit - Private

CMS Certification Number650003

Location133 Route 3Dededo, GU 96929 · Guam County

Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 96913 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

$92.50 typical visit price

range $60.53 – $180.05

Typical copayment $23.12 (range $15.13 – $45.01)

Most-billed visit code 99203

Established Patient

$74.92 typical visit price

range $20.09 – $147.56

Typical copayment $18.73 (range $5.02 – $36.89)

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 9

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

SPECTRUM CONSULTING GROUP

Clinic/Center

280 PALE SAN VITORES RD
TAMUNING, GU 96913

Guam (671) 689-4219

DR. KIRK BELLIS D.O.

Psychiatry & Neurology (Child & Adolescent Psychiatry)

280 PALE SAN VITORES RD, SUNFLOWER VILLA SUITE 205
TAMUNING, GU 96913

Guam (671) 646-4757

HAFA SPECIALIST GROUP LLP

Specialist

280 PALE SAN VITORES RD
TAMUNING, GU 96913

Guam (671) 647-4542

KEVIN JOHN SULLIVAN CRNA

Nurse Anesthetist, Certified Registered

280 PALE SAN VITORES RD
TAMUNING, GU 96913

Guam (671) 647-4542

REST ASSURED ANESTHESIA SERVICES, INC.

Nurse Anesthetist, Certified Registered

280 PALE SAN VITORES RD
TAMUNING, GU 96913

Guam (671) 486-6368

DR. JOHN A FEGURGUR M.D.

Surgery (Plastic and Reconstructive Surgery)

280 PALE SAN VITORES RD
TAMUNING, GU 96913

Guam (671) 647-4542

DR. KIA M RAHMANI M.D.

Surgery

280 PALE SAN VITORES RD
TAMUNING, GU 96913

Guam (671) 647-4542

DR. JITKA LOM M.D.

Family Medicine

280 PALE SAN VITORES RD
TAMUNING, GU 96913

Guam (671) 647-4542

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 Alexandra Leon Guerrero's NPI number?

The NPI number for Alexandra Leon Guerrero is 1780020586. It was assigned to this individual provider in the NPPES registry on May 20, 2013.

Where is Alexandra Leon Guerrero located?

Alexandra Leon Guerrero practices at 280 Pale San Vitores Rd, Tamuning, GU 96913. The listed phone number is (671) 647-4542.

What is Alexandra Leon Guerrero's specialty?

The primary specialty registered for this NPI is Surgery with taxonomy code 208600000X.

Is Alexandra Leon Guerrero enrolled in Medicare?

Yes. Alexandra Leon Guerrero 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 Alexandra Leon Guerrero's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Alexandra Leon Guerrero reassigns Medicare benefits to 2 organizations: Guam Healthcare Development Incorporated (Dededo, GU) and Hafa Specialist Group LLP (Tamuning, GU). 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 Alexandra Leon Guerrero's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Alexandra Leon Guerrero affiliated with any hospitals?

According to CMS data, Alexandra Leon Guerrero is affiliated with Guam Memorial Hospital Authority and Guam Regional Medical City.

When was this NPI record last updated?

The NPPES record for Alexandra Leon Guerrero was last updated on August 27, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.