Mark C. Littlejohn, MD
Otolaryngology Physician · Frisco, TX
Mark C. Littlejohn, MD is an otolaryngology physician with a practice address in Frisco, Texas, and NPI 1932176252, issued on Mar 6, 2006. Check the license (Texas H5784, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mark C. Littlejohn
- Credential
- MD
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- H5784 TX
Self-reported in NPPES; status is on the state search - Practice location
- 8380 Warren Pkwy Ste 504, Frisco, TX 75034
- Phone
- (972) 596-4005
- Enumerated
- Mar 6, 2006
- Record last updated
- Nov 28, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (972) 985-1253
- Medicare enrollment
- Enrolled (PECOS I20041222000837); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical Branch At Galveston, 1988
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 790 in Texas → Look up another NPI →
Also registered at 8380 Warren Pkwy Ste 504
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tony Peter, MDOtolaryngology Physician1023549870
Verify Mark C. Littlejohn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license H5784Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average otolaryngology physician in 2024
1,842 Medicare Part D claims for 556 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. Brand-name drugs were under 1% of claims. 43 claims were for opioids.
Most prescribed
- Famotidine650 claims
- Pantoprazole Sodium391 claims
- Ipratropium Bromide163 claims
- Clotrimazole-Betamethasone80 claims
- Omeprazole71 claims
- Amoxicillin-Clavulanate Potass68 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
- Christus Trinity ClinicTyler, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark C. Littlejohn among 790 otolaryngology physician records in Texas
Mark C. Littlejohn, MD is one of 790 otolaryngology 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 20% of them.
- NPI issued2006 · 20% of these records are older, 48% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1988 · median 2003 among the 552 with a school on file
- Record last updated2018 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in Texas
There are 790 otolaryngology physician records in Texas.
All 790 in Texas → Every provider in Frisco → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Jordan Cain, M.D.Frisco, TX 750341326364548
- Kenny Carter, M.D.Frisco, TX 750341043307804
- William Cobb, M.D.Frisco, TX 750341730149691
- Keith Matheny, M.D.Frisco, TX 750341205805462
- Tony Peter, MDFrisco, TX 750341023549870
- Ewen Tseng, M.D.Frisco, TX 750341053380469
- Dale Ehmer, M.D.Frisco, TX 750351710030473
- Patti Huang, MDFrisco, TX 750351710955893
Common questions
What is Mark C. Littlejohn, MD's NPI number?
Mark C. Littlejohn, MD's National Provider Identifier (NPI) is 1932176252, issued on Mar 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark C. Littlejohn, MD located?
The NPPES record lists a practice address at 8380 Warren Pkwy Ste 504, Frisco, TX, 75034. Phone: (972) 596-4005. Providers update this record themselves, so call before visiting.
How can I verify Mark C. Littlejohn, MD's license?
NPPES lists Texas license number H5784, 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 Mark C. Littlejohn, MD prescribe under Medicare Part D?
In 2024, Mark C. Littlejohn, MD had 1,842 Medicare Part D claims for 556 beneficiaries; the average among otolaryngology physician prescribers was 541. 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.