Mariel Bagley, MD
Family Medicine Physician · San Marcos, TX
Mariel Bagley, MD is a family medicine physician with a practice address in San Marcos, Texas, and NPI 1235622986, issued on Jun 7, 2018. Check the license (Texas S8958, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Mariel Bagley
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- S8958 TX
Self-reported in NPPES; status is on the state search - Practice location
- 2430 S IH 35 Ste 101, San Marcos, TX 78666
- Phone
- (128) 786-9465
- Enumerated
- Jun 7, 2018
- Entity
- Type 1 · individual
Verify Mariel Bagley in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license S8958Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
46% fewer Medicare Part D claims than the average family medicine physician in 2024
1,908 Medicare Part D claims for 249 beneficiaries, against an average of 3,519 among the 111,126 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 38 claims were for opioids.
Most prescribed
- Atorvastatin Calcium115 claims
- Levothyroxine Sodium85 claims
- Metformin Hcl78 claims
- Losartan Potassium64 claims
- Amlodipine Besylate50 claims
- Gabapentin49 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.
One hospital or facility affiliation
- Christus Trinity ClinicSan Marcos, TX
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
27 family medicine physician records list a San Marcos practice address
They are 27 of the 1,003 NPPES records with a San Marcos practice address, and 10,592 family medicine physician records in Texas.
All 27 in San Marcos → All 10,592 in Texas → Every provider in San Marcos →
Other family medicine physician records in Texas
- Srinivasa Aaluri, MDEl Paso, TX1265566509
- Maira Aamir, MDShenandoah, TX1932660859
- Fakhrudin Aaseemah Mohamed, M.DAllen, TX1952782518
- So Abad, MDWichita Falls, TX1184624694
- Yoseph AbadiRichardson, TX1700742640
- Marcus Abadie, M.D.Athens, TX1104821107
- Montserrat Abadie Sole, M.D.Fort Worth, TX1245437078
- Sarah Abang-Hayes, M.D.San Antonio, TX1326244724
- Syed Abbas, M.D.Houston, TX1821267477
- Lisa Abbott, M.D.Mansfield, TX1700847779
Common questions
What is Mariel Bagley, MD's NPI number?
Mariel Bagley, MD's National Provider Identifier (NPI) is 1235622986, issued on Jun 7, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Mariel Bagley, MD located?
The NPPES record lists a practice address at 2430 S IH 35 Ste 101, San Marcos, TX, 78666. Phone: (128) 786-9465. Providers update this record themselves, so call before visiting.
How can I verify Mariel Bagley, MD's license?
NPPES lists Texas license number S8958, 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 Mariel Bagley, MD prescribe under Medicare Part D?
In 2024, Mariel Bagley, MD had 1,908 Medicare Part D claims for 249 beneficiaries; the average among family medicine physician prescribers was 3,519. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.