Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Alexandra Herrero Leon Guerrero, MD

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1780020586

Dr. Alexandra Herrero Leon Guerrero, MD practises General Surgery in Tamuning, Guam. Graduated from New York University School of Medicine in 2013, 13 years ago. Practices with Guam Healthcare Development Incorporated, a 209-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Guam.

Years since qualifying
13
Trained at
New York University School of Medicine
Licensed in
GU
In the registry since
2013
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address may be wrong

The ZIP code does not match the city and state on this record. Call before visiting.

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Tamuning, GU

No coordinates on file. Search this address in Google Maps

Additional practice locations (1)

  • 550 1st Ave, New York, NY 10016-6402 — (212) 263-5506

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence M-2170 (GU)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1780020586
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 20, 2013
Last updated in NPPESAugust 27, 2019

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGENERAL SURGERY
Medical schoolNEW YORK UNIVERSITY SCHOOL OF MEDICINE
Graduated 2013 (13 years in practice)
Group practice Guam Healthcare Development Incorporated — 209 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 71 times · 71st percentile
Mastectomy 12 times · 67th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 33 times · 57th percentile
Hernia repair (minimally invasive) 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients169
Services billed 340 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Guam Healthcare Development Incorporated

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 209 clinicians in the practice; 12 are shown here.

Other providers in Tamuning