Billy A. De Los Santos, MD
Internal Medicine Physician · Sunnyvale, TX
Billy A. De Los Santos, MD is an internal medicine physician with a practice address in Sunnyvale, Texas, and NPI 1386885614, issued on Mar 17, 2009. Check the license (Texas P0899, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Billy A. De Los Santos
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- P0899 TX
262040 NY
Self-reported in NPPES; status is on the state search - Practice location
- 341 Wheatfield Dr Ste 100, Sunnyvale, TX 75182
- Phone
- (972) 285-0221
- Enumerated
- Mar 17, 2009
- Record last updated
- Jun 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (972) 285-0223
- Medicare enrollment
- Enrolled (PECOS I20111202000436); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 341 Wheatfield Dr Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Daniel Barrios, NPPrimary Care Nurse Practitioner1770993818
- Ankoor Kambhampaty, MDFamily Medicine Physician1811427222
- Sojin Kim, NPFamily Nurse Practitioner1982138608
- Sarah Moore, AGNPNurse Practitioner1649401266
- Sarah Ouimet, PA-CPhysician Assistant1487388203
- Julyana Yamassaki-Davidson, FNP-CFamily Nurse Practitioner1164137691
Verify Billy A. De Los Santos in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license P0899Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average internal medicine physician in 2024
8,387 Medicare Part D claims for 799 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 21 claims were for opioids.
Most prescribed
- Atorvastatin Calcium679 claims
- Lisinopril322 claims
- Losartan Potassium321 claims
- Levothyroxine Sodium304 claims
- Amlodipine Besylate299 claims
- Metformin Hcl291 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: $85.13
5 payments; by number, the most common kind was food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Wellmed Medical Group PASunnyvale, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Billy A. De Los Santos among 9,175 internal medicine physician records in Texas
Billy A. De Los Santos, MD is one of 9,175 internal medicine physician records with a practice address in Texas. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 54% of them.
- NPI issued2009 · 54% of these records are older, 42% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2007 · median 2004 among the 6,088 with a school on file
- Record last updated2021 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
8 internal medicine physician records list a practice address in Sunnyvale
They are 8 of the 213 NPPES records with a practice address in Sunnyvale, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Sunnyvale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Agha Abbas, MDSunnyvale, TX 751821326001843
- Suresh Belame, M.D.Sunnyvale, TX 751821356667612
- Godfrey Chithambo, MDSunnyvale, TX 751821366470379
- Ahmed Hassan, D.O.Sunnyvale, TX 751821508249285
- Ramya KedikaSunnyvale, TX 751821821477720
- Farah Masood, MDSunnyvale, TX 751821447403563
- Roby RajanSunnyvale, TX 751821225278559
- Mustafa Firoz, M.D.Wills Point, TX 751691720040686
Common questions
What is Billy A. De Los Santos, MD's NPI number?
Billy A. De Los Santos, MD's National Provider Identifier (NPI) is 1386885614, issued on Mar 17, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Billy A. De Los Santos, MD located?
The NPPES record lists a practice address at 341 Wheatfield Dr Ste 100, Sunnyvale, TX, 75182. Phone: (972) 285-0221. Providers update this record themselves, so call before visiting.
How can I verify Billy A. De Los Santos, MD's license?
NPPES lists Texas license number P0899, 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 Billy A. De Los Santos, MD prescribe under Medicare Part D?
In 2024, Billy A. De Los Santos, MD had 8,387 Medicare Part D claims for 799 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.