Warren William Simi, MD
Internal Medicine Physician · Houston, TX
Warren William Simi, MD is an internal medicine physician with a practice address in Houston, Texas, and NPI 1255329561, issued on Oct 11, 2005. Check the license (Texas D 9661, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Warren William Simi
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- D 9661 TX
Self-reported in NPPES; status is on the state search - Practice location
- 4126 Southwest Fwy, Houston, TX 77027
- Phone
- (713) 479-1100
- Enumerated
- Oct 11, 2005
- Record last updated
- Dec 11, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (713) 622-6910
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 4126 Southwest Fwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Warren William Simi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license D 9661Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,143 Medicare Part D claims for 202 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 11 claims were for opioids.
Most prescribed
- Atorvastatin Calcium288 claims
- Amlodipine Besylate140 claims
- Losartan Potassium105 claims
- Metoprolol Succinate101 claims
- Lisinopril96 claims
- Gabapentin85 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.
Warren William Simi among 9,175 internal medicine physician records in Texas
Warren William Simi, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2007 · 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).
1,488 internal medicine physician records list a practice address in Houston
They are 1,488 of the 61,221 NPPES records with a practice address in Houston, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Houston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Srijhansi Adusumilli, M.D.Houston, TX 770271144260944
- Shezi Ali-Kirmani, MDHouston, TX 770271235123811
- Rene Del Valle, MDHouston, TX 770271669419966
- Michael Eisenberg, M.D.Houston, TX 770271609817162
- Nam Hoang, M.D.Houston, TX 770271578563524
- Terence Holmes, M.D.Houston, TX 770271134106651
- Scott Lisse, MDHouston, TX 770271346245818
- Shi-Tze Lu, M.D.Houston, TX 770271215932900
Common questions
What is Warren William Simi, MD's NPI number?
Warren William Simi, MD's National Provider Identifier (NPI) is 1255329561, issued on Oct 11, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Warren William Simi, MD located?
The NPPES record lists a practice address at 4126 Southwest Fwy, Houston, TX, 77027. Phone: (713) 479-1100. Providers update this record themselves, so call before visiting.
How can I verify Warren William Simi, MD's license?
NPPES lists Texas license number D 9661, 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 Warren William Simi, MD prescribe under Medicare Part D?
In 2024, Warren William Simi, MD had 2,143 Medicare Part D claims for 202 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.