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MARLEN CABALLERO DIAZ APRN-CNP
NPI 1437970126
Nurse Practitioner - Acute Care in San Antonio, TX

Active since October 24, 2024PECOS EnrolledAccepts Medicare Assignment
215 N SAN SABA STE 206, SAN ANTONIO, TX 78207(210) 615-6626(210) 477-0279 Get Directions Write a Review

NPPES record last updated: June 26, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 2, 2026, Jan 30, 2026 (2 updates tracked since 2026).

About Marlen Caballero Diaz Aprn-cnp NPPES

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

MARLEN CABALLERO DIAZ APRN-CNP (NPI 1437970126) is an individual acute care provider in San Antonio, Texas, licensed in Texas (1178704) and active in the NPI registry since October 2024. She is enrolled in Medicare PECOS, is affiliated with Methodist Dallas Medical Center, and maintains 5 additional practice locations.

NPPES Registry Identity

NPI1437970126
Entity TypeIndividualFemale
Primary Taxonomy363LA2100X
Provider Legal NameMARLEN CABALLERO DIAZCredential: APRN-CNP
Location Address215 N SAN SABA STE 206San Antonio, TX 78207-3120
Mailing AddressPo Box 650002, Dept 8286Dallas, TX 75265-0002 · (210) 212-8622
Phone(210) 615-6626
Fax(210) 477-0279
Sole ProprietorNo
Medical School CMSOtherGraduated 2024
Enumeration DateOctober 24, 2024
Last NPPES UpdateJune 26, 20262 updates tracked since enumeration
NPPES CertifiedJune 26, 2026
✔ NPI 1437970126 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Acute CarePhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LA2100X
License✔ Licensed in TX · 1178704
215 N SAN SABA STE 206, San Antonio, TX 78207
Open in Google Maps ↗

Other Names 1

Former Name (1)Marlen Caballero Np

Secondary Practice Locations 5

Location 111212 State Highway 151 Ste 320San Antonio, TX 78251-4502 · Phone (210) 572-3317 · Fax (210) 477-0279
Location 28115 Datapoint Dr Ste 200San Antonio, TX 78229-3745 · Phone (210) 615-6626 · Fax (210) 477-0279
Location 3701 Secretary DrArlington, TX 76015-1623 · Phone (817) 617-2040 · Fax (817) 617-2055
Location 4559 E Ovilla RdRed Oak, TX 75154-3505 · Phone (214) 286-6565 · Fax (817) 533-6015
Location 51441 N Beckley AveDallas, TX 75203-1201 · Phone (214) 947-5000 · Fax (214) 947-5040

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

Marlen Caballero Diaz Aprn-cnp 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 ID7416138524
PECOS Enrollment IDI20241120003568
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

3

Medicare enrollment records show Marlen Diaz reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

M. Reza Mizani, M.D., P.A.
Same address
Nephrology
215 N SAN SABA STE 301
San Antonio, TX 78207
  • Reassigned Medicare billing, Texas enrollment
  • Medicare enrollment name: M Reza Mizani MD PA
  • 29 clinicians in this Medicare group
NPI 1275503393 (210) 212-8622
Homeheal PA
237 mi
Undersea and Hyperbaric Medicine
559 E OVILLA RD
Red Oak, TX 75154
  • Reassigned Medicare billing, Texas enrollment
  • 7 clinicians in this Medicare group
NPI 1003427196 (214) 286-6565
Maryam Raza MD PA
250 mi
Internal Medicine
1441 N. BECKLEY
Dallas, TX 75203
  • Reassigned Medicare billing, Texas enrollment
  • 9 clinicians in this Medicare group
NPI 1811159122 (214) 355-2600

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

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

Methodist Dallas Medical Center

Acute Care Hospitals · Dallas, TX
3/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number450051
Location1441 North Beckley AvenueDallas, TX 75203 · Dallas County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78207 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
$84.92 typical visit price
range $54.84 – $166.88
Typical copayment $21.23 (range $13.71 – $41.72)
Most-billed visit code 99203
Established Patient
$97.05 typical visit price
range $17.52 – $136.11
Typical copayment $24.26 (range $4.38 – $34.02)
Most-billed visit code 99214
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 5

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

SARAHY ORAMAS PA-C
Physician Assistant
215 N SAN SABA STE 206
SAN ANTONIO, TX 78207
Bexar County (210) 615-6626
JOSE ANDRES DIAZ MD
Internal Medicine (Cardiovascular Disease)
215 N SAN SABA STE 206
SAN ANTONIO, TX 78207
Bexar County (210) 477-3271
DR. CARMELO OTERO M.D.
Surgery
215 N SAN SABA STE 206
SAN ANTONIO, TX 78207
Bexar County (210) 615-6626
ERICA MARTINEZ-CASTRO NP
Nurse Practitioner (Primary Care)
215 N SAN SABA STE 206
SAN ANTONIO, TX 78207
Bexar County (210) 615-6626
DIMITRIOS MISERLIS M.D.
Surgery (Vascular Surgery)
215 N SAN SABA STE 206
SAN ANTONIO, TX 78207
Bexar County (210) 615-6626

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 Marlen Diaz's NPI number?

The NPI number for Marlen Diaz is 1437970126. It was assigned to this individual provider in the NPPES registry on October 24, 2024. The provider is also known as Marlen Caballero Np.

Where is Marlen Diaz located?

Marlen Diaz practices at 215 N San Saba Ste 206, San Antonio, TX 78207. The listed phone number is (210) 615-6626.

What is Marlen Diaz's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Acute Care, with taxonomy code 363LA2100X.

Is Marlen Diaz enrolled in Medicare?

Yes. Marlen 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 Marlen Diaz's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marlen Diaz reassigns Medicare benefits to 3 organizations: M. Reza Mizani, M.D., P.A. (San Antonio, TX), Homeheal PA (Red Oak, TX) and Maryam Raza MD PA (Dallas, TX). 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 Marlen Diaz's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Marlen 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 Marlen 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 Marlen Diaz affiliated with any hospitals?

According to CMS data, Marlen Diaz is affiliated with Methodist Dallas Medical Center.

When was this NPI record last updated?

The NPPES record for Marlen Diaz was last updated on June 26, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.