DR. OMAR DIAZ MD
NPI 1548765845
Emergency Medicine in Laredo, TX
About Dr. Omar Diaz Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. OMAR DIAZ MD (NPI 1548765845) is an individual emergency medicine provider in Laredo, Texas, licensed in Texas (T2591) and active in the NPI registry since March 2018. He is enrolled in Medicare PECOS, is affiliated with Laredo Medical Center, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (2018).
NPPES Registry Identity
Specialties & Licenses
Accepted 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
Dr. Omar 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.
Medicare Billing Reassignments
8Medicare enrollment records show Omar Diaz reassigns Medicare billing to 8 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Laredo, TX 78041
- Reassigned Medicare billing, Texas enrollment
- 3 clinicians in this Medicare group
Laredo, TX 78045
- Reassigned Medicare billing, Texas enrollment
- 119 clinicians in this Medicare group
Laredo, TX 78041
- Reassigned Medicare billing, Texas enrollment
- 86 clinicians in this Medicare group
San Antonio, TX 78229
- Reassigned Medicare billing, Texas enrollment
- 1,452 clinicians in this Medicare group
Lumberton, TX 77657
- Reassigned Medicare billing, Texas enrollment
- 113 clinicians in this Medicare group
Kankakee, IL 60901
- Reassigned Medicare billing, Illinois enrollment
- 61 clinicians in this Medicare group
Yorkville, IL 60560
- Reassigned Medicare billing, Illinois enrollment
- 116 clinicians in this Medicare group
Olympia Fields, IL 60461
- Reassigned Medicare billing, Illinois enrollment
- 41 clinicians in this Medicare group
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 4
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.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Laredo Medical Center
Acute Care Hospitals · Laredo, TXMethodist Hospital
Acute Care Hospitals · San Antonio, TXMethodist Hospital Stone Oak
Acute Care Hospitals · San Antonio, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 78041 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 3
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Omar Diaz's NPI number?
The NPI number for Omar Diaz is 1548765845. It was assigned to this individual provider in the NPPES registry on March 28, 2018.
Where is Omar Diaz located?
Omar Diaz practices at 3402 E Del Mar Blvd Ste 184, Laredo, TX 78041. The listed phone number is (956) 267-4667.
What is Omar Diaz's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Omar Diaz enrolled in Medicare?
Yes. Omar 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 Omar Diaz's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Omar Diaz reassigns Medicare benefits to 8 organizations: Wellness Whisper, PLLC, (Laredo, TX), Webb Emergency Medicine Associates PA (Laredo, TX), Laredo Emergency Medicine Associates PA (Laredo, TX), Emergency Medicine Services Of Tx, PLLC (San Antonio, TX), Texas ER Group PLLC (Lumberton, TX) and 3 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 Omar Diaz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Omar Diaz accept?
Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 6 other insurers list Omar 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 Omar Diaz affiliated with any hospitals?
According to CMS data, Omar Diaz is affiliated with Laredo Medical Center, Methodist Hospital and Methodist Hospital Stone Oak.
When was this NPI record last updated?
The NPPES record for Omar Diaz was last updated on June 14, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. Omar Diaz, MD · NPI 1548765845
Emergency Medicine physician in Laredo, Texas. Individual provider, active in the CMS NPPES registry since March 28, 2018.
## Identity
- **NPI:** 1548765845 (Entity type: Individual)
- **Enumerated:** March 28, 2018
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** T2591 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 3402 E DEL MAR BLVD STE 184, Laredo, TX 78041-6592
- **Phone:** (956) 267-4667 · **Fax:** (956) 435-0138
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 8 organizations under Medicare reassignment (form CMS-855R): Wellness Whisper, PLLC, (NPI 1275393324, Laredo, TX); Webb Emergency Medicine Associates PA (NPI 1770543555, Laredo, TX); Laredo Emergency Medicine Associates PA (NPI 1144254327, Laredo, TX); Emergency Medicine Services Of Tx, PLLC (NPI 1245938729, San Antonio, TX); Texas ER Group PLLC (NPI 1235829359, Lumberton, TX); and 3 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 2018
## Record status
- **NPPES last updated:** June 14, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1548765845) · Data from the CMS NPPES public registry.