Mark A. Thomas, MD
Internal Medicine Physician · Topeka, KS
Mark A. Thomas, MD is an internal medicine physician with a practice address in Topeka, Kansas, and NPI 1629086277, issued on Aug 3, 2006. Check the license (Kansas 04-25848, as entered in NPPES) on the Kansas State Board of Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Mark A. Thomas
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 04-25848 KS
Self-reported in NPPES; status is on the state search - Practice location
- 4409 SW Shenandoah RD, Topeka, KS 66610
- Phone
- (785) 554-6259
- Enumerated
- Aug 3, 2006
- Record last updated
- May 1, 2026
- Medicaid ID
- 100180660A KS
- Medicare enrollment
- Enrolled (PECOS I20100713000636); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,010 in Kansas → Look up another NPI →
Verify Mark A. Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersKansas State Board of Healing Arts
Search for license 04-25848Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.0 times the Medicare Part D claims of the average internal medicine physician in 2024
9,674 Medicare Part D claims for 690 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 130 claims were for opioids.
Most prescribed
- Atorvastatin Calcium879 claims
- Amlodipine Besylate725 claims
- Levothyroxine Sodium519 claims
- Losartan Potassium469 claims
- Omeprazole332 claims
- Rosuvastatin Calcium263 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.
Bills Medicare through one group practice
- Cotton-O'Neil Clinic Revocable TrustTopeka, KS
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark A. Thomas among 1,010 internal medicine physician records in Kansas
Mark A. Thomas, MD is one of 1,010 internal medicine physician records with a practice address in Kansas. 73% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 63% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 56% of these records are
- Graduated1990 · median 2008 among the 568 with a school on file
- Record last updated2026 · 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 Kansas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
52 internal medicine physician records list a practice address in Topeka
They are 52 of the 4,851 NPPES records with a practice address in Topeka, and 1,010 internal medicine physician records in Kansas.
All 1,010 in Kansas → Every provider in Topeka → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Joyce Allen, M.D.Topeka, KS 666071831285808
- Jamal Akhtar, M.D.Topeka, KS 666061336692953
- Ekta Aneja, MDTopeka, KS 666061649653098
- Shravana Bheemanathi, MDTopeka, KS 666061699182626
- Freddy Cooper, MDTopeka, KS 666061821658519
- Traci Cuevas, MDTopeka, KS 666061649489287
- Austin Fehr, MDTopeka, KS 666061922680982
- Bradley MarplesTopeka, KS 666061063504942
Common questions
What is Mark A. Thomas, MD's NPI number?
Mark A. Thomas, MD's National Provider Identifier (NPI) is 1629086277, issued on Aug 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark A. Thomas, MD located?
The NPPES record lists a practice address at 4409 SW Shenandoah RD, Topeka, KS, 66610. Phone: (785) 554-6259. Providers update this record themselves, so call before visiting.
How can I verify Mark A. Thomas, MD's license?
NPPES lists Kansas license number 04-25848, as entered by the provider. Search the Kansas State Board of Healing Arts at https://www.ksbha.ks.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark A. Thomas, MD prescribe under Medicare Part D?
In 2024, Mark A. Thomas, MD had 9,674 Medicare Part D claims for 690 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.