MR. NICHOLAS PATRICK CALLAHAN MSN, CRNA
NPI 1750901757
Nurse Anesthetist, Certified Registered in Grand Rapids, MI
About Mr. Nicholas Patrick Callahan Msn, Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. NICHOLAS PATRICK CALLAHAN MSN, CRNA (NPI 1750901757) is an individual nurse anesthetist, certified registered in Grand Rapids, Michigan, licensed in Michigan (4704303499NSA2006D) and active in the NPI registry since April 2020. He is affiliated with Mercy Health Saint Mary's and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses 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
Mr. Nicholas Patrick Callahan Msn, Crna 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 Nicholas Callahan reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Grand Rapids, MI 49503
- Reassigned Medicare billing, Michigan enrollment
- 199 clinicians in this Medicare group
Irving, TX 75038
- Reassigned Medicare billing, Michigan enrollment
- 283 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 3
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercy Health Saint Mary's
Acute Care Hospitals · Grand Rapids, MICorewell Health Gerber Hospital
Critical Access Hospitals · Fremont, MIPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 49503 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.
GRAND RAPIDS, MI 49503
GRAND RAPIDS, MI 49503
GRAND RAPIDS, MI 49503
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 Nicholas Callahan's NPI number?
The NPI number for Nicholas Callahan is 1750901757. It was assigned to this individual provider in the NPPES registry on April 20, 2020.
Where is Nicholas Callahan located?
Nicholas Callahan practices at 200 Jefferson Ave SE, Grand Rapids, MI 49503. The listed phone number is (616) 685-5000.
What is Nicholas Callahan's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Nicholas Callahan enrolled in Medicare?
Yes. Nicholas Callahan 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 Nicholas Callahan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Callahan reassigns Medicare benefits to 2 organizations: Saint Mary's Health Services (Grand Rapids, MI) and Northstar Anesthesia Of Michigan II PC (Irving, TX). 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 Nicholas Callahan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Nicholas Callahan affiliated with any hospitals?
According to CMS data, Nicholas Callahan is affiliated with Mercy Health Saint Mary's and Corewell Health Gerber Hospital.
When was this NPI record last updated?
The NPPES record for Nicholas Callahan was last updated on October 26, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Mr. Nicholas Patrick Callahan, MSN, CRNA · NPI 1750901757
Nurse Anesthetist, Certified Registered physician in Grand Rapids, Michigan. Individual provider, active in the CMS NPPES registry since April 20, 2020.
## Identity
- **NPI:** 1750901757 (Entity type: Individual)
- **Enumerated:** April 20, 2020
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** 4704303499NSA2006D (Michigan)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 JEFFERSON AVE SE, Grand Rapids, MI 49503-4502
- **Phone:** (616) 685-5000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Saint Mary's Health Services (NPI 1124063078, Grand Rapids, MI); Northstar Anesthesia Of Michigan II PC (NPI 1437268026, Irving, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** October 26, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1750901757) · Data from the CMS NPPES public registry.