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ALEXANDRA HALLAGAN MD
NPI 1669053898
Emergency Medicine in Saint Louis, MO

Active since April 19, 2021PECOS EnrolledAccepts Medicare Assignment
10010 KENNERLY RD, SAINT LOUIS, MO 63128(314) 525-1906(314) 525-4148 Get Directions Write a Review

NPPES record last updated: October 31, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Sep 6, 2024, Apr 19, 2021 (2 updates tracked since 2021).

About Alexandra Hallagan Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ALEXANDRA HALLAGAN MD (NPI 1669053898) is an individual emergency medicine provider in Saint Louis, Missouri, licensed in Missouri (2025028073) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS, is affiliated with Mercy Hospital South, and is a graduate of Ohio State University College Of Medicine (2021).

NPPES Registry Identity

NPI1669053898
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameALEXANDRA HALLAGANCredential: MD
Location Address10010 KENNERLY RDSaint Louis, MO 63128-2106
Mailing Address10010 Kennerly RdSaint Louis, MO 63128-2106 · (314) 525-1906 · Fax (314) 525-4148
Phone(314) 525-1906
Fax(314) 525-4148
Sole ProprietorNo
Medical School CMSOhio State University College Of MedicineGraduated 2021
Enumeration DateApril 19, 2021
Last NPPES UpdateOctober 31, 20252 updates tracked since enumeration
NPPES CertifiedOctober 31, 2025
✔ NPI 1669053898 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in MO · 2025028073
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
10010 KENNERLY RD, Saint Louis, MO 63128
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Antidote Health Plan of Arizona, Inc., Imperial Insurance Companies, Inc..Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Alexandra Hallagan Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8628500956
PECOS Enrollment IDI20251106004695
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
29 services28 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000
An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.
13 services12 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercy Hospital South

Acute Care Hospitals · Saint Louis, MO
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number260077
Location10010 Kennerly RoadSaint Louis, MO 63128 · St. Louis County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63128 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$86.32 typical visit price
range $55.65 – $169.38
Typical copayment $21.58 (range $13.91 – $42.34)
Most-billed visit code 99203
Established Patient
$98.37 typical visit price
range $17.76 – $137.92
Typical copayment $24.59 (range $4.44 – $34.48)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JEREMY STEPHEN COLYER AA
Anesthesiologist Assistant
10010 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (636) 386-7222
REHABILITATION MEDICINE SPECIALISTS, INC.
Physical Medicine & Rehabilitation
10010 KENNERLY RD, 4TH FLOOR - ACUTE REHAB
SAINT LOUIS, MO 63128
St. Louis County (314) 525-4522
DR. MICHAEL D. BAZZANI M.D.
Radiology (Diagnostic Radiology)
10010 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-1165
DR. YUNHONG ZHANG MD
Anesthesiology
10010 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-1000
REBECCA SUSAN HOPKINS R.D., L.D.
Dietitian, Registered
10010 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-1266
MRS. CASSANDRA ASHLEY STROTHKAMP NP-C
Nurse Practitioner (Family)
10010 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-1900
RAHUL GUPTA MD
Emergency Medicine
10010 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-1906
YIFU F ZHU AA
Anesthesiologist Assistant
10010 KENNERLY RD
SAINT LOUIS, MO 63128
St. Louis County (314) 525-1000

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Alexandra Hallagan's NPI number?

The NPI number for Alexandra Hallagan is 1669053898. It was assigned to this individual provider in the NPPES registry on April 19, 2021.

Where is Alexandra Hallagan located?

Alexandra Hallagan practices at 10010 Kennerly Rd, Saint Louis, MO 63128. The listed phone number is (314) 525-1906.

What is Alexandra Hallagan's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Alexandra Hallagan enrolled in Medicare?

Yes. Alexandra Hallagan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Alexandra Hallagan accept?

Health plans from Antidote Health Plan of Arizona, Inc. and Imperial Insurance Companies, Inc. list Alexandra Hallagan as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Alexandra Hallagan affiliated with any hospitals?

According to CMS data, Alexandra Hallagan is affiliated with Mercy Hospital South.

When was this NPI record last updated?

The NPPES record for Alexandra Hallagan was last updated on October 31, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.