David Alan Diaz, M.D.
Family Medicine Physician · Round Rock, TX
David Alan Diaz, M.D. is a family medicine physician with a practice address in Round Rock, Texas, and NPI 1033106380, issued on Oct 3, 2005. Check the license (Texas J1080, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- David Alan Diaz
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- J1080 TX
Self-reported in NPPES; status is on the state search - Practice location
- 15930 S Great Oaks Dr, Round Rock, TX 78681
- Phone
- (512) 246-3338
- Enumerated
- Oct 3, 2005
- Record last updated
- Jul 13, 2026
- Fax
- (512) 246-3368
- Medicare enrollment
- Enrolled (PECOS I20040623000284); accepts Medicare assignment
- Medical or professional school
- University Of Texas Southwestern Medical School At Dallas, 1990
- Entity
- Type 1 · individual
Also registered at 15930 S Great Oaks Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Debaroti Addy, MDPediatrics Physician1023016235
- Lindsay Armstrong, CPNPPediatric Registered Nurse1871895045
- Kassandra Bustos, BCBA LBABehavior Analyst1366123341
- Rebekah Fahey, MA, BCBABehavior Analyst1154030799
- Kaylee JonesBehavior Analyst1750232393
- Kara Moellenberg, CPNPPediatric Nurse Practitioner1558796821
Verify David Alan Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license J1080Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% fewer Medicare Part D claims than the average family medicine physician in 2024
2,304 Medicare Part D claims for 255 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium126 claims
- Hydrochlorothiazide124 claims
- Rosuvastatin Calcium118 claims
- Lisinopril110 claims
- Levothyroxine Sodium107 claims
- Pravastatin Sodium93 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $241.15
13 payments; by number, the most common kind was food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Great Oaks Family Practice PARound Rock, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
86 family medicine physician records list a practice address in Round Rock
They are 86 of the 3,815 NPPES records with a practice address in Round Rock, and 11,119 family medicine physician records in Texas.
All 86 in Round Rock → All 11,119 in Texas → Every provider in Round Rock →
Other family medicine physician records in Texas
- Srinivasa Aaluri, MDEl Paso, TX1265566509
- Maira Aamir, MDShenandoah, TX1932660859
- Fakhrudin Aaseemah Mohamed, M.DAllen, TX1952782518
- So Abad, MDWichita Falls, TX1184624694
- Yoseph AbadiRichardson, TX1700742640
- Marcus Abadie, M.D.Athens, TX1104821107
- Montserrat Abadie Sole, M.D.Fort Worth, TX1245437078
- Sarah Abang-Hayes, M.D.San Antonio, TX1326244724
- Ahmad Abazid, M.DRichardson, TX1013238401
- Syed Abbas, M.D.Houston, TX1821267477
Common questions
What is David Alan Diaz, M.D.'s NPI number?
David Alan Diaz, M.D.'s National Provider Identifier (NPI) is 1033106380, issued on Oct 3, 2005. An NPI identifies a provider in billing; it is not a license.
Where is David Alan Diaz, M.D. located?
The NPPES record lists a practice address at 15930 S Great Oaks Dr, Round Rock, TX, 78681. Phone: (512) 246-3338. Providers update this record themselves, so call before visiting.
How can I verify David Alan Diaz, M.D.'s license?
NPPES lists Texas license number J1080, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does David Alan Diaz, M.D. prescribe under Medicare Part D?
In 2024, David Alan Diaz, M.D. had 2,304 Medicare Part D claims for 255 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.