MARK A. SPEYER MD
NPI 1649464488
Internal Medicine - Hospice and Palliative Medicine in Winfield, IL
About Mark A. Speyer Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK A. SPEYER MD (NPI 1649464488) is an individual hospice and palliative medicine provider in Winfield, Illinois, licensed in Illinois (036119500) and active in the NPI registry since September 2007. He is enrolled in Medicare PECOS, is affiliated with Northwestern Medicine Central Dupage Hospital, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Locations 2
Other Identifiers 2
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
Mark A. Speyer 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 Mark Speyer reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 1,664 clinicians in this Medicare group
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 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 4
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Northwestern Medicine Central Dupage Hospital
Acute Care Hospitals · Winfield, ILMedicare 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.
WINFIELD, IL 60190
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 Mark Speyer's NPI number?
The NPI number for Mark Speyer is 1649464488. It was assigned to this individual provider in the NPPES registry on September 5, 2007.
Where is Mark Speyer located?
Mark Speyer practices at 25 N Winfield Rd, Winfield, IL 60190. The listed phone number is (630) 933-4847.
What is Mark Speyer's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hospice and Palliative Medicine, with taxonomy code 207RH0002X.
Is Mark Speyer enrolled in Medicare?
Yes. Mark Speyer 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 Mark Speyer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Speyer reassigns Medicare benefits to 2 organizations: Central Dupage Physician Group (Carol Stream, IL) and Northwestern Medical Faculty Foundation (Carol Stream, IL). 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 Mark Speyer's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mark Speyer affiliated with any hospitals?
According to CMS data, Mark Speyer is affiliated with Northwestern Medicine Central Dupage Hospital.
When was this NPI record last updated?
The NPPES record for Mark Speyer was last updated on January 24, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Mark A. Speyer, MD · NPI 1649464488
Hospice and Palliative Medicine physician in Winfield, Illinois. Individual provider, active in the CMS NPPES registry since September 5, 2007.
## Identity
- **NPI:** 1649464488 (Entity type: Individual)
- **Enumerated:** September 5, 2007
- **Primary specialty:** Internal Medicine - Hospice and Palliative Medicine · taxonomy 207RH0002X
- **State license:** 036119500 (Illinois)
- **Sole proprietor:** No
## Practice location
- **Address:** 25 N WINFIELD RD, Winfield, IL 60190-1295
- **Phone:** (630) 933-4847 · **Fax:** (630) 933-3826
## 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): Central Dupage Physician Group (NPI 1033149844, Carol Stream, IL); Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 2004
## Record status
- **NPPES last updated:** January 24, 2024
- **Other identifiers:** Other F400446455 (IL); Other 206147 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1649464488) · Data from the CMS NPPES public registry.