Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DAVID ALAN DIAZ M.D.
NPI 1033106380
Family Medicine in Round Rock, TX

Q: What is David Diaz's NPI number?

The NPI number for David Diaz is 1033106380. It was assigned to this individual provider in the NPPES registry on October 3, 2005.

Q: What is David Diaz's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Q: When was this NPI record last updated?

The NPPES record for David Diaz was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 days 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.

Active since October 03, 2005PECOS Enrolled

15930 S GREAT OAKS DR, A-200, ROUND ROCK, TX 78681(512) 246-3338(512) 246-3368 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About David Alan Diaz M.d. NPPES

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

DAVID ALAN DIAZ M.D. (NPI 1033106380) is an individual family medicine provider in Round Rock, Texas, licensed in Texas (J1080) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS and is a graduate of University Of Texas Southwestern Medical School At Dallas (1990).

NPPES Registry Identity

NPI1033106380

Entity TypeIndividualMale

Primary Taxonomy207Q00000X

Provider Legal NameDAVID ALAN DIAZCredential: M.D.

Location Address15930 S GREAT OAKS DR, A-200Round Rock, TX 78681-5526

Mailing Address15930 S Great Oaks Dr, A-200Round Rock, TX 78681-5526 · (512) 246-3338 · Fax (512) 246-3368

Phone(512) 246-3338

Fax(512) 246-3368

Sole ProprietorNo

Medical School CMSUniversity Of Texas Southwestern Medical School At DallasGraduated 1990

Enumeration DateOctober 3, 2005

Last NPPES UpdateJuly 13, 2026

✔ NPI 1033106380 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207Q00000X

License✔ Licensed in TX · J1080

Definition

Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.

15930 S GREAT OAKS DR, Round Rock, TX 78681

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Other Identifiers 1

OtherJ1080TX · State Medical License

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Texas, Moda Health Plan, Inc., UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

David Alan Diaz 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 ID7517942568

PECOS Enrollment IDI20040623000284

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.

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.

145 services85 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

112 services77 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

72 services72 patients

Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment G0402

An Initial Preventive Physical Examination, also known as a "Welcome to Medicare" visit, is a one-time, face-to-face visit during your first 12 months of Medicare enrollment. It includes a review of your health, as well as education and counseling about preventive services and further screenings.

21 services21 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78681 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 12

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

OAK AND IVORY DENTAL

Dentist (General Practice)

15930 S GREAT OAKS DR
ROUND ROCK, TX 78681

Williamson County (512) 645-1375

DEBAROTI M ADDY MD

Pediatrics

15930 S GREAT OAKS DR, BUILDING B
ROUND ROCK, TX 78681

Williamson County (512) 255-8868

SHANE B. MILLS, D.O.

Family Medicine

15930 S GREAT OAKS DR, A-200
ROUND ROCK, TX 78681

Williamson County (512) 246-3338

REBEKAH L FAHEY MA, BCBA

Behavior Analyst

15930 S GREAT OAKS DR
ROUND ROCK, TX 78681

Williamson County (512) 460-1950

KASSANDRA BUSTOS BCBA LBA

Behavior Analyst

15930 S GREAT OAKS DR
ROUND ROCK, TX 78681

Williamson County (512) 460-1950

DR. ANSELMO G UNITE MD

Pediatrics

15930 S GREAT OAKS DR, BUILDING B
ROUND ROCK, TX 78681

Williamson County (512) 255-8868

GREAT OAKS FAMILY PRACTICE, PA

Family Medicine

15930 S GREAT OAKS DR, A-200
ROUND ROCK, TX 78681

Williamson County (512) 246-3338

KRISTIE L WILSON RN, MSN, CPNP

Nurse Practitioner (Pediatrics)

15930 S GREAT OAKS DR
ROUND ROCK, TX 78681

Williamson County (512) 255-8868

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 David Diaz's NPI number?

The NPI number for David Diaz is 1033106380. It was assigned to this individual provider in the NPPES registry on October 3, 2005.

Where is David Diaz located?

David Diaz practices at 15930 S Great Oaks Dr A-200, Round Rock, TX 78681. The listed phone number is (512) 246-3338.

What is David Diaz's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is David Diaz enrolled in Medicare?

Yes. David 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.

What insurance does David Diaz accept?

Health plans from Blue Cross and Blue Shield of Texas, Moda Health Plan, Inc. and UnitedHealthcare list David 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.

When was this NPI record last updated?

The NPPES record for David Diaz was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 26 days 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.