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GIANCARLO ANDRES DIAZ MD
NPI 1538740394
Anesthesiology in San Antonio, TX

Active since April 14, 2021PECOS EnrolledAccepts Medicare Assignment
4502 MEDICAL DR, SAN ANTONIO, TX 78229(210) 358-4000(210) 358-4775 Get Directions Write a Review

NPPES record last updated: March 4, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 4, 2026, Dec 23, 2025, Dec 18, 2025 and 2 more (5 updates tracked since 2021).

About Giancarlo Andres Diaz Md NPPES

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

GIANCARLO ANDRES DIAZ MD (NPI 1538740394) is an individual anesthesiology provider in San Antonio, Texas, licensed in Texas (W1774) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS, is affiliated with Crouse Hospital, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1538740394
Entity TypeIndividualMale
Primary Taxonomy207L00000X
Provider Legal NameGIANCARLO ANDRES DIAZCredential: MD
Location Address4502 MEDICAL DRSan Antonio, TX 78229-4492
Mailing Address4502 Medical DrSan Antonio, TX 78229-4402 · (210) 358-4000 · Fax (210) 358-4775
Phone(210) 358-4000
Fax(210) 358-4775
Sole ProprietorNo
Medical School CMSOtherGraduated 2021
Enumeration DateApril 14, 2021
Last NPPES UpdateMarch 4, 20265 updates tracked since enumeration
NPPES CertifiedMarch 4, 2026
✔ NPI 1538740394 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAnesthesiologyAllopathic & Osteopathic Physicians
Taxonomy Code207L00000X
License✔ Licensed in TX · W1774
Definition
An anesthesiologist is trained to provide pain relief and maintenance, or restoration, of a stable condition during and immediately following an operation or an obstetric or diagnostic procedure. The anesthesiologist assesses the risk of the patient undergoing surgery and optimizes the patient's condition prior to, during and after surgery. In addition to these management responsibilities, the anesthesiologist provides medical management and consultation in pain management and critical care medicine. Anesthesiologists diagnose and treat acute, long-standing and cancer pain problems; diagnose and treat patients with critical illnesses or severe injuries; direct resuscitation in the care of patients with cardiac or respiratory emergencies, including the need for artificial ventilation; and supervise post-anesthesia recovery.
4502 MEDICAL DR, San Antonio, TX 78229
Open in Google Maps ↗

Secondary Practice Locations 2

Location 11310 McCullough AveSan Antonio, TX 78212-5601 · Phone (210) 757-2200
Location 25106 W Loop 1604 NSan Antonio, TX 78251-4408 · Phone (726) 243-2000

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

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

Giancarlo Andres Diaz 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 ID1557878519
PECOS Enrollment IDI20250725001859, I20251230003906
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

5

Medicare enrollment records show Giancarlo Diaz reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Uthscsa Dental School
0.2 mi
Oral and Maxillofacial Surgery
7703 FLOYD CURL DR
San Antonio, TX 78229
  • Reassigned Medicare billing, Texas enrollment
  • Medicare enrollment name: University Of Texas Health Science Center At San Antonio
  • 2,397 clinicians in this Medicare group
NPI 1750403887 (210) 567-3274
Community Medicine Associates
7.0 mi
Family Medicine
903 W MARTIN ST # MS 49-2
San Antonio, TX 78207
  • Reassigned Medicare billing, Texas enrollment
  • 1,129 clinicians in this Medicare group
NPI 1245313329 (210) 358-3401
Lone Star Anesthesia Partners PLLC
8.9 mi
Anesthesiology
19802 MESSINA
San Antonio, TX 78258
  • Reassigned Medicare billing, Texas enrollment
  • 144 clinicians in this Medicare group
NPI 1124760996 (210) 412-4310
Independent Physicians Network PLLC
250 mi
Anesthesiology
3625 N HALL ST # 800
Dallas, TX 75219
  • Reassigned Medicare billing, Texas enrollment
  • 495 clinicians in this Medicare group
NPI 1396274676 (214) 252-3500
North American Partners In Anesthesia LLP
1,614 mi
Anesthesiology
1305 WALT WHITMAN RD STE 300
Melville, NY 11747
  • Reassigned Medicare billing, New York enrollment
  • 508 clinicians in this Medicare group
NPI 1649264706 (516) 945-3000

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

Hospital Affiliations CMS Care Compare 2

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

Crouse Hospital

Acute Care Hospitals · Syracuse, NY
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number330203
Location736 Irving AvenueSyracuse, NY 13210 · Onondaga County
Emergency services Birthing friendly

Methodist Hospital

Acute Care Hospitals · San Antonio, TX
4/5 CMS rating
OwnershipProprietary
CMS Certification Number450388
Location7700 Floyd Curl DrSan Antonio, TX 78229 · Bexar County
Emergency services Birthing friendly

Other Providers at the Same Location NPPES 20

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

EDUARDO N. POLLONO MD
Internal Medicine (Cardiovascular Disease)
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 358-4000
DR. MAHDIEH IRAN NEJAD PARIZI M.D.
Student in an Organized Health Care Education/Training Program
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 358-2015
RICHARD LEE BALLENTINE D.M.D.
Student in an Organized Health Care Education/Training Program
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 358-2015
MR. STEVAN REYES PTA
Physical Therapy Assistant
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 358-4253
MRS. CLAIRE LELEUX BEADLE CRNA
Nurse Anesthetist, Certified Registered
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 358-4000
NNENNA AWAGU CRNA
Nurse Anesthetist, Certified Registered
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 567-4500
DR. CYNTHIA N NGUYEN PHARMD
Pharmacist
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 743-4034
DR. JONATHAN EDWARD SLOVIK MD
Hospitalist
4502 MEDICAL DR
SAN ANTONIO, TX 78229
Bexar County (210) 358-4000

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 Giancarlo Diaz's NPI number?

The NPI number for Giancarlo Diaz is 1538740394. It was assigned to this individual provider in the NPPES registry on April 14, 2021.

Where is Giancarlo Diaz located?

Giancarlo Diaz practices at 4502 Medical Dr, San Antonio, TX 78229. The listed phone number is (210) 358-4000.

What is Giancarlo Diaz's specialty?

The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.

Is Giancarlo Diaz enrolled in Medicare?

Yes. Giancarlo Diaz 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 Giancarlo Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Giancarlo Diaz reassigns Medicare benefits to 5 organizations: Uthscsa Dental School (San Antonio, TX), Community Medicine Associates (San Antonio, TX), Lone Star Anesthesia Partners PLLC (San Antonio, TX), Independent Physicians Network PLLC (Dallas, TX) and North American Partners In Anesthesia LLP (Melville, NY). 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 Giancarlo Diaz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Giancarlo Diaz accept?

Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 5 other insurers list Giancarlo Diaz as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Giancarlo Diaz affiliated with any hospitals?

According to CMS data, Giancarlo Diaz is affiliated with Crouse Hospital and Methodist Hospital.

When was this NPI record last updated?

The NPPES record for Giancarlo Diaz was last updated on March 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months 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.