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DR. ANN MARIE HENNESSEY M.D.
NPI 1053471581
Pediatrics in Saint Louis, MO

Active since December 12, 2006PECOS Enrolled
621 S NEW BALLAS RD STE 1001B, SAINT LOUIS, MO 63141(314) 872-8752(314) 872-3963 Get Directions Write a Review

NPPES record last updated: June 1, 2020. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. Ann Marie Hennessey M.d. NPPES

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

DR. ANN MARIE HENNESSEY M.D. (NPI 1053471581) is an individual pediatrics provider in Saint Louis, Missouri, licensed in Missouri (101575) and active in the NPI registry since December 2006. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1053471581
Entity TypeIndividualFemale
Primary Taxonomy208000000X
Provider Legal NameDR. ANN MARIE HENNESSEYCredential: M.D.
Location Address621 S NEW BALLAS RD STE 1001BSaint Louis, MO 63141-8264
Mailing Address621 S New Ballas Rd Ste 1001bSaint Louis, MO 63141-8264 · (314) 872-8752 · Fax (314) 872-3963
Phone(314) 872-8752
Fax(314) 872-3963
Sole ProprietorNo
Enumeration DateDecember 12, 2006
Last NPPES UpdateJune 1, 2020
NPPES CertifiedJune 1, 2020
✔ NPI 1053471581 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians
Taxonomy Code208000000X
License✔ Licensed in MO · 101575
Definition
A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.
621 S NEW BALLAS RD STE 1001B, Saint Louis, MO 63141
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ann Marie Hennessey M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignments

2

Medicare enrollment records show Ann Hennessey reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mercy Clinic East Communities
Same address
Family Medicine
615 S NEW BALLAS RD, ADMINISTRATION BUILDING, 5TH FLOOR
Saint Louis, MO 63141
  • Reassigned Medicare billing, Missouri enrollment
  • 744 clinicians in this Medicare group
NPI 1043574940 (314) 251-6000
Mercy Hospitals East Communities
Same address
Clinic/Center
615 S NEW BALLAS RD
Saint Louis, MO 63141
  • Reassigned Medicare billing, Missouri enrollment
  • 435 clinicians in this Medicare group
NPI 1851431738 (314) 251-6382

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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
$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.

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 Ann Hennessey's NPI number?

The NPI number for Ann Hennessey is 1053471581. It was assigned to this individual provider in the NPPES registry on December 12, 2006.

Where is Ann Hennessey located?

Ann Hennessey practices at 621 S New Ballas Rd Ste 1001B, Saint Louis, MO 63141. The listed phone number is (314) 872-8752.

What is Ann Hennessey's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Ann Hennessey enrolled in Medicare?

Yes. Ann Hennessey is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ann Hennessey's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ann Hennessey reassigns Medicare benefits to 2 organizations: Mercy Clinic East Communities (Saint Louis, MO) and Mercy Hospitals East Communities (Saint Louis, MO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Ann Hennessey's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ann Hennessey accept?

Health plans from Anthem Blue Cross and Blue Shield list Ann Hennessey 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.

When was this NPI record last updated?

The NPPES record for Ann Hennessey was last updated on June 1, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.