Alexandra Hallagan, MD
Emergency Medicine Physician · Saint Louis, MO
Alexandra Hallagan, MD is an emergency medicine physician with a practice address in Saint Louis, Missouri, and NPI 1669053898, issued on Apr 19, 2021. Check the license (Missouri 2025028073, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Alexandra Hallagan
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 2025028073 MO
Self-reported in NPPES; status is on the state search - Practice location
- 10010 Kennerly RD, Saint Louis, MO 63128
- Phone
- (314) 525-1906
- Enumerated
- Apr 19, 2021
- Record last updated
- Oct 31, 2025
- Fax
- (314) 525-4148
- Medicare enrollment
- Enrolled (PECOS I20251106004695); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 2021
- Entity
- Type 1 · individual
Also registered at 10010 Kennerly RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Haley Anderson, PHARMDPharmacist1548889389
- Rebecca Appelgren, MDAnesthesiology Physician1306825955
Verify Alexandra Hallagan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2025028073Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% fewer Medicare Part D claims than the average emergency medicine physician in 2024
88 Medicare Part D claims for 60 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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 affiliation
- Mercy Hospital SouthSaint Louis, MO · Acute Care Hospitals2 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
398 emergency medicine physician records list a practice address in Saint Louis
They are 398 of the 27,605 NPPES records with a practice address in Saint Louis, and 1,405 emergency medicine physician records in Missouri.
All 398 in Saint Louis → All 1,405 in Missouri → Every provider in Saint Louis →
Other emergency medicine physician records in Missouri
- Robert Abbott, M.D.Saint Charles, MO1144269267
- Nagla Abdelmalek, M.D.Saint Louis, MO1003847591
- Donald Ables, MDKansas City, MO1346222189
- Allison Abma, DOBranson, MO1033613302
- Sean Abraham, D.O.Columbia, MO1326368994
- Lajon Addison, D.O.Columbia, MO1104871854
- Adegoke Adeleke, M.D., M.S.MMountain View, MO1568753481
- Opeolu Adeoye, MDSaint Louis, MO1023120623
- Lukuman Afuwape, M.DKansas City, MO1639494412
- Lourdes Aguilo Rodriguez, M.D.Joplin, MO1861804056
Common questions
What is Alexandra Hallagan, MD's NPI number?
Alexandra Hallagan, MD's National Provider Identifier (NPI) is 1669053898, issued on Apr 19, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Alexandra Hallagan, MD located?
The NPPES record lists a practice address at 10010 Kennerly RD, Saint Louis, MO, 63128. Phone: (314) 525-1906. Providers update this record themselves, so call before visiting.
How can I verify Alexandra Hallagan, MD's license?
NPPES lists Missouri license number 2025028073, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alexandra Hallagan, MD prescribe under Medicare Part D?
In 2024, Alexandra Hallagan, MD had 88 Medicare Part D claims for 60 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.