LEO I STEMP MD
NPI 1528020278
Internal Medicine - Critical Care Medicine in Springfield, MA
About Leo I Stemp Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LEO I STEMP MD (NPI 1528020278) is an individual critical care medicine provider in Springfield, Massachusetts, licensed in Massachusetts (78458) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Holyoke Medical Center, and is a graduate of Harvard Medical School (1983).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 3
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
Leo I Stemp 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 Leo Stemp reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Springfield, MA 01104
- Reassigned Medicare billing, Massachusetts enrollment
- 21 clinicians in this Medicare group
Holyoke, MA 01040
- Reassigned Medicare billing, Massachusetts enrollment
- 51 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 5
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.
Holyoke Medical Center
Acute Care Hospitals · Holyoke, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 01104 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.
SPRINGFIELD, MA 01104
SPRINGFIELD, MA 01104
SPRINGFIELD, MA 01104
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 Leo Stemp's NPI number?
The NPI number for Leo Stemp is 1528020278. It was assigned to this individual provider in the NPPES registry on April 6, 2006.
Where is Leo Stemp located?
Leo Stemp practices at 300 Stafford St Suite 300, Springfield, MA 01104. The listed phone number is (413) 748-9860.
What is Leo Stemp's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.
Is Leo Stemp enrolled in Medicare?
Yes. Leo Stemp 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 Leo Stemp's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leo Stemp reassigns Medicare benefits to 2 organizations: Adfinitas Health At The Mercy Hospital PLLC (Springfield, MA) and Holyoke Medical Center, Inc. (Holyoke, MA). 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 Leo Stemp's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Leo Stemp affiliated with any hospitals?
According to CMS data, Leo Stemp is affiliated with Holyoke Medical Center.
When was this NPI record last updated?
The NPPES record for Leo Stemp was last updated on January 10, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Leo I Stemp, MD · NPI 1528020278
Critical Care Medicine physician in Springfield, Massachusetts. Individual provider, active in the CMS NPPES registry since April 6, 2006.
## Identity
- **NPI:** 1528020278 (Entity type: Individual)
- **Enumerated:** April 6, 2006
- **Primary specialty:** Internal Medicine - Critical Care Medicine · taxonomy 207RC0200X
- **State license:** 78458 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 STAFFORD ST, SUITE 300, Springfield, MA 01104-3581
- **Phone:** (413) 748-9860
## 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): Adfinitas Health At The Mercy Hospital PLLC (NPI 1669036737, Springfield, MA); Holyoke Medical Center, Inc. (NPI 1750395737, Holyoke, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 1983
## Record status
- **NPPES last updated:** January 10, 2008
- **Other identifiers:** Medicaid 3142400 (MA); Medicare PIN J30188 (MA); Medicare UPIN E93930
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Source: [NPI Profile](https://npiprofile.com/npi/1528020278) · Data from the CMS NPPES public registry.