Robert Louis Koster, M.D.
Internal Medicine Physician · Dallas, TX
Robert Louis Koster, M.D. is an internal medicine physician with a practice address in Dallas, Texas, and NPI 1023116530, issued on Sep 20, 2006. Check the license (Texas E1640, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Robert Louis Koster
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- E1640 TX
Self-reported in NPPES; status is on the state search - Practice location
- 3600 Gaston Ave, Dallas, TX 75246
- Phone
- (214) 823-4200
- Enumerated
- Sep 20, 2006
- Record last updated
- Nov 11, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (214) 823-2591
- Medicaid IDs
- 125488006 TX
125488004 TX - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 3600 Gaston Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Robert Louis Koster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license E1640Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
62 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium11 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.
Robert Louis Koster among 9,175 internal medicine physician records in Texas
Robert Louis Koster, M.D. 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2011 · 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).
956 internal medicine physician records list a practice address in Dallas
They are 956 of the 36,304 NPPES records with a practice address in Dallas, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Dallas → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Allison, M.D.Dallas, TX 752461750339719
- Uyen-Thi Cao, MDDallas, TX 752461639100555
- Susan Favour, MDDallas, TX 752461205895562
- Linsheng Guo, M.D.Dallas, TX 752461053365510
- Donald Kennerly, MDDallas, TX 752461538124763
- Susan Kohl, MDDallas, TX 752461528098811
- Ruth Krishnan, M.D.Dallas, TX 752461265480685
- Andrew Masica, M.D.Dallas, TX 752461881625440
Common questions
What is Robert Louis Koster, M.D.'s NPI number?
Robert Louis Koster, M.D.'s National Provider Identifier (NPI) is 1023116530, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Louis Koster, M.D. located?
The NPPES record lists a practice address at 3600 Gaston Ave, Dallas, TX, 75246. Phone: (214) 823-4200. Providers update this record themselves, so call before visiting.
How can I verify Robert Louis Koster, M.D.'s license?
NPPES lists Texas license number E1640, 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 Robert Louis Koster, M.D. prescribe under Medicare Part D?
In 2024, Robert Louis Koster, M.D. had 62 Medicare Part D claims; 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.