Frederick Earl Dixon, MD
Sleep Medicine (Internal Medicine) Physician · San Marcos, TX
Frederick Earl Dixon, MD is a sleep medicine (internal medicine) physician with a practice address in San Marcos, Texas, and NPI 1023079613, issued on Mar 31, 2006. Check the license (Texas L5723, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Frederick Earl Dixon
- Credential
- MD
- Primary taxonomy
- Sleep Medicine (Internal Medicine) Physician 207RS0012X
- License number
- L5723 TX
Self-reported in NPPES; status is on the state search - Practice location
- 326 N Lbj Dr Ste 104, San Marcos, TX 78666
- Phone
- (512) 572-1033
- Enumerated
- Mar 31, 2006
- Record last updated
- Feb 13, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20240905001684); accepts Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 1979
- Entity
- Type 1 · individual
8 nearest sleep medicine (internal medicine) physician records → All 56 in Texas → Look up another NPI →
Verify Frederick Earl Dixon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license L5723Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12% fewer Medicare Part D claims than the average sleep medicine (internal medicine) physician in 2024
514 Medicare Part D claims for 159 beneficiaries, against an average of 585 among the 852 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Metoprolol Succinate110 claims
- Xarelto42 claims
- Atorvastatin Calcium34 claims
- Carvedilol34 claims
- Eliquis28 claims
- Diltiazem 24hr Er (Cd)25 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
- Dean Health Systems IncLodi, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Frederick Earl Dixon among 56 sleep medicine (internal medicine) physician records in Texas
Frederick Earl Dixon, MD is one of 56 sleep medicine (internal medicine) physician records with a practice address in Texas. 80% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 45% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1979 · median 2000 among the 38 with a school on file
- Record last updated2019 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RS0012X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Sleep Medicine (Internal Medicine) Physician providers in Texas
There are 56 sleep medicine (internal medicine) physician records in Texas.
All 56 in Texas → Every provider in San Marcos → Sleep Medicine (Internal Medicine) Physician nationwide →
The 8 sleep medicine (internal medicine) physician records with the nearest ZIP codes
- James Curlee, D.O.Georgetown, TX 786281932100765
- Sabina LinGeorgetown, TX 786281316406408
- Vani Vallabhaneni, M.DAustin, TX 787501447273644
- Roberto Diaz, M.D.Corpus Christi, TX 784121851300891
- Sonam Jaggi, MDCorpus Christi, TX 784111528486933
- Collin Clay, MDJbsa Lackland, TX 782361205332210
- Jaclyn Faulk, DOJbsa Lackland, TX 782361578093126
- William Frey, MDJbsa Lackland, TX 782361427049345
Common questions
What is Frederick Earl Dixon, MD's NPI number?
Frederick Earl Dixon, MD's National Provider Identifier (NPI) is 1023079613, issued on Mar 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Frederick Earl Dixon, MD located?
The NPPES record lists a practice address at 326 N Lbj Dr Ste 104, San Marcos, TX, 78666. Phone: (512) 572-1033. Providers update this record themselves, so call before visiting.
How can I verify Frederick Earl Dixon, MD's license?
NPPES lists Texas license number L5723, 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 Frederick Earl Dixon, MD prescribe under Medicare Part D?
In 2024, Frederick Earl Dixon, MD had 514 Medicare Part D claims for 159 beneficiaries; the average among sleep medicine (internal medicine) physician prescribers was 585. 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.