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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MS. HAYDAN ELIZABETH OMMEN PA
NPI 1699525121
Physician Assistant in Saint Louis, MO

Active since March 26, 2024PECOS Enrolled
701 S NEW BALLAS RD STE 320, SAINT LOUIS, MO 63141(314) 251-7888(314) 251-7887 Get Directions Write a Review

NPPES record last updated: October 29, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Ms. Haydan Elizabeth Ommen Pa NPPES

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

MS. HAYDAN ELIZABETH OMMEN PA (NPI 1699525121) is an individual physician assistant in Saint Louis, Missouri, licensed in Missouri (2024006376) and active in the NPI registry since March 2024. She is enrolled in Medicare PECOS, is affiliated with Mercy Hospital South, and is a graduate of Other (2023).

NPPES Registry Identity

NPI1699525121
Entity TypeIndividualFemale
Primary Taxonomy363A00000X
Provider Legal NameMS. HAYDAN ELIZABETH OMMENCredential: PA
Location Address701 S NEW BALLAS RD STE 320Saint Louis, MO 63141-8725
Mailing Address701 S New Ballas Rd Ste 320Saint Louis, MO 63141-8725 · (314) 251-7888 · Fax (314) 251-7887
Phone(314) 251-7888
Fax(314) 251-7887
Sole ProprietorNo
Medical School CMSOtherGraduated 2023
Enumeration DateMarch 26, 2024
Last NPPES UpdateOctober 29, 2026
NPPES CertifiedOctober 29, 2026
✔ NPI 1699525121 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPhysician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363A00000X
License✔ Licensed in MO · 2024006376
Definition
A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.
701 S NEW BALLAS RD STE 320, Saint Louis, MO 63141
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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

Ms. Haydan Elizabeth Ommen Pa 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 ID3375076342
PECOS Enrollment IDI20241029003069
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.

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 63141 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
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
Most-billed visit code 99213
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

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

DR. NABIL AHMAD M.D.
Physical Medicine & Rehabilitation (Pain Medicine)
701 S NEW BALLAS RD STE 320
SAINT LOUIS, MO 63141
St. Louis County (314) 251-7888

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 Haydan Ommen's NPI number?

The NPI number for Haydan Ommen is 1699525121. It was assigned to this individual provider in the NPPES registry on March 26, 2024.

Where is Haydan Ommen located?

Haydan Ommen practices at 701 S New Ballas Rd Ste 320, Saint Louis, MO 63141. The listed phone number is (314) 251-7888.

What is Haydan Ommen's specialty?

The primary specialty registered for this NPI is Physician Assistant with taxonomy code 363A00000X.

Is Haydan Ommen enrolled in Medicare?

Yes. Haydan Ommen 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.

Is Haydan Ommen affiliated with any hospitals?

According to CMS data, Haydan Ommen is affiliated with Mercy Hospital South.

When was this NPI record last updated?

The NPPES record for Haydan Ommen was last updated on October 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 days 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.