Bryon Callahan, M.D.
Emergency Medicine Physician · Houston, TX
Bryon Callahan, M.D. is an emergency medicine physician with a practice address in Houston, Texas, and NPI 1659717734, issued on May 16, 2013. Check the license (Texas Q8216, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Bryon Callahan
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- Q8216 TX
191711 NC
Self-reported in NPPES; status is on the state search - Practice location
- 1635 North Loop W, Houston, TX 77008
- Phone
- (713) 867-2000
- Enumerated
- May 16, 2013
- Record last updated
- Sep 13, 2024
- Medicare enrollment
- Enrolled (PECOS I20160609002526); accepts Medicare assignment
- Medical or professional school
- Texas Tech University Health Science Center School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 4,885 in Texas → Look up another NPI →
Also registered at 1635 North Loop W
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mustafa Abdulrahman, MBCHBHospitalist Physician1730615873
- Ronke Alo, M.DHospitalist Physician1982136800
- Miriam Anemelu, M.DHospitalist Physician1669712980
- Charles Ardoin, M.D.Family Medicine Physician1972635274
- Patience Asu, PHARMDPharmacist1346177938
- Mulikat Babatunde-LayeniFamily Nurse Practitioner1780221374
Verify Bryon Callahan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license Q8216Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% more Medicare Part D claims than the average emergency medicine physician in 2024
406 Medicare Part D claims for 238 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 30 claims were for opioids.
Most prescribed
- Dicyclomine Hcl51 claims
- Tizanidine Hcl34 claims
- Ondansetron Odt33 claims
- Albuterol Sulfate Hfa28 claims
- Levofloxacin22 claims
- Azithromycin20 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
- Memorial Hermann Hospital Based Physician GroupHouston, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Bryon Callahan among 4,885 emergency medicine physician records in Texas
Bryon Callahan, M.D. is one of 4,885 emergency medicine physician records with a practice address in Texas. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 59% of them.
- NPI issued2013 · 59% of these records are older, 37% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2013 · median 2013 among the 2,779 with a school on file
- Record last updated2024 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
818 emergency medicine physician records list a practice address in Houston
They are 818 of the 61,221 NPPES records with a practice address in Houston, and 4,885 emergency medicine physician records in Texas.
All 4,885 in Texas → Every provider in Houston → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Ross Bauer, MDHouston, TX 770081932125879
- Michael Bublewicz, M.D.Houston, TX 770081083941819
- Harparminder Chadha, M.D., FACEPHouston, TX 770081770508137
- Elizabeth Edwards, M.D.Houston, TX 770081689691123
- Habacuc Garcia, M.D.Houston, TX 770081316964877
- Vanessa Garza-Miranda, M.D.Houston, TX 770081073861233
- Davida Manor, M.D.Houston, TX 770081427138114
- Maricruz Medina-Marquis, M.D.Houston, TX 770081598780926
Common questions
What is Bryon Callahan, M.D.'s NPI number?
Bryon Callahan, M.D.'s National Provider Identifier (NPI) is 1659717734, issued on May 16, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Bryon Callahan, M.D. located?
The NPPES record lists a practice address at 1635 North Loop W, Houston, TX, 77008. Phone: (713) 867-2000. Providers update this record themselves, so call before visiting.
How can I verify Bryon Callahan, M.D.'s license?
NPPES lists Texas license number Q8216, 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 Bryon Callahan, M.D. prescribe under Medicare Part D?
In 2024, Bryon Callahan, M.D. had 406 Medicare Part D claims for 238 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.