Cynthia R. Muller, MD
Internal Medicine Physician · Dallas, TX
Cynthia R. Muller, MD is an internal medicine physician with a practice address in Dallas, Texas, and NPI 1689695561, issued on Jul 23, 2006. Check the license (Texas L6122, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Cynthia R. Muller
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- L6122 TX
Self-reported in NPPES; status is on the state search - Practice location
- 12221 Merit Dr, Dallas, TX 75251
- Phone
- (214) 217-1900
- Enumerated
- Jul 23, 2006
- Record last updated
- Mar 30, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid IDs
- 167359204 TX
167359205 TX
167359203 TX - Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 12221 Merit Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Derek Bennetsen, DOEmergency Medicine Physician1720011232
- Pradeep Bodige, D.O.Emergency Medicine Physician1235367368
- David Brunett, MDEmergency Medicine Physician1255658027
Verify Cynthia R. Muller in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license L6122Check 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
63 Medicare Part D claims for 14 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Dextroamphetamine-Amphetamine15 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.
Cynthia R. Muller among 9,175 internal medicine physician records in Texas
Cynthia R. Muller, 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 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 updated2012 · 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
- Asma Ashraf, M.D.Dallas, TX 752511063439529
- Rafael Canadas-Zizzias, M.D.Dallas, TX 752511801897616
- Dipauni Doshi, M.D.Dallas, TX 752511831162874
- Laila Hirjee, M.D.Dallas, TX 752511588678437
- James Ikemba, MDDallas, TX 752511124055579
- Bill Johnson, MDDallas, TX 752511568411205
- Zulfiqar Jussa, MDDallas, TX 752511265490544
- Hadi Ladak, M.D.Dallas, TX 752511275583973
Common questions
What is Cynthia R. Muller, MD's NPI number?
Cynthia R. Muller, MD's National Provider Identifier (NPI) is 1689695561, issued on Jul 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Cynthia R. Muller, MD located?
The NPPES record lists a practice address at 12221 Merit Dr, Dallas, TX, 75251. Phone: (214) 217-1900. Providers update this record themselves, so call before visiting.
How can I verify Cynthia R. Muller, MD's license?
NPPES lists Texas license number L6122, 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 Cynthia R. Muller, MD prescribe under Medicare Part D?
In 2024, Cynthia R. Muller, MD had 63 Medicare Part D claims for 14 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.