DR. IAN SEAN HAGEMANN MD
NPI 1275795569
Pathology - Anatomic Pathology in Saint Louis, MO
About Dr. Ian Sean Hagemann Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. IAN SEAN HAGEMANN MD (NPI 1275795569) is an individual anatomic pathology provider in Saint Louis, Missouri, licensed in Missouri (2011001458) and active in the NPI registry since June 2008. He is enrolled in Medicare PECOS, is affiliated with Memorial Hospital, and is a graduate of Washington University School Of Medicine (2008).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Ian Sean Hagemann 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.
Medicare Billing Reassignments
2Medicare enrollment records show Ian Hagemann reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63110
- Reassigned Medicare billing, Missouri enrollment
- 77 clinicians in this Medicare group
Saint Louis, MO 63108
- Reassigned Medicare billing, Illinois enrollment
- 530 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 7
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.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Memorial Hospital
Acute Care Hospitals · Belleville, ILBarnes Jewish Hospital
Acute Care Hospitals · Saint Louis, MOMissouri Baptist Medical Center
Acute Care Hospitals · Town And Country, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
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 Ian Hagemann's NPI number?
The NPI number for Ian Hagemann is 1275795569. It was assigned to this individual provider in the NPPES registry on June 27, 2008.
Where is Ian Hagemann located?
Ian Hagemann practices at 1 Barnes Jewish Hospital Plz Div PA Anatomic And Molecular Path, Saint Louis, MO 63110. The listed phone number is (314) 362-5641.
What is Ian Hagemann's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Anatomic Pathology, with taxonomy code 207ZP0101X.
Is Ian Hagemann enrolled in Medicare?
Yes. Ian Hagemann 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.
Which organizations bill Medicare for Ian Hagemann's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ian Hagemann reassigns Medicare benefits to 2 organizations: Washington University (Saint Louis, MO) and Washington University Physicians In Illinois, Inc (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 Ian Hagemann's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Ian Hagemann affiliated with any hospitals?
According to CMS data, Ian Hagemann is affiliated with Memorial Hospital, Barnes Jewish Hospital and Missouri Baptist Medical Center.
When was this NPI record last updated?
The NPPES record for Ian Hagemann was last updated on April 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Dr. Ian Sean Hagemann, MD · NPI 1275795569
Anatomic Pathology physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since June 27, 2008.
## Identity
- **NPI:** 1275795569 (Entity type: Individual)
- **Enumerated:** June 27, 2008
- **Primary specialty:** Pathology - Anatomic Pathology · taxonomy 207ZP0101X
- **State license:** 2011001458 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 BARNES JEWISH HOSPITAL PLZ, DIV PA ANATOMIC AND MOLECULAR PATH, Saint Louis, MO 63110-1003
- **Phone:** (314) 362-5641 · **Fax:** (314) 362-0369
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Washington University (NPI 1316987746, Saint Louis, MO); Washington University Physicians In Illinois, Inc (NPI 1457203135, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Washington University School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** April 17, 2025
- **Other identifiers:** Medicaid 200005773 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1275795569) · Data from the CMS NPPES public registry.