KATHERINE MARINA GROSNER
NPI 1427630243
Nurse Anesthetist, Certified Registered in Williamsville, NY
About Katherine Marina Grosner NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KATHERINE MARINA GROSNER (NPI 1427630243) is an individual nurse anesthetist, certified registered in Williamsville, New York, licensed in New York (673311-1) and active in the NPI registry since April 2021. She is affiliated with Kaleida Health and is a graduate of Other (2021).
NPPES Registry Identity
Specialties & Licenses
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
Katherine Marina Grosner 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
3Medicare enrollment records show Katherine Grosner reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Williamsville, NY 14221
- Reassigned Medicare billing, New York enrollment
- 21 clinicians in this Medicare group
Amherst, NY 14226
- Reassigned Medicare billing, New York enrollment
- 41 clinicians in this Medicare group
Cheektowaga, NY 14225
- Reassigned Medicare billing, New York enrollment
- 124 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Kaleida Health
Acute Care Hospitals · Buffalo, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 14221 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.
WILLIAMSVILLE, NY 14221
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 Katherine Grosner's NPI number?
The NPI number for Katherine Grosner is 1427630243. It was assigned to this individual provider in the NPPES registry on April 21, 2021.
Where is Katherine Grosner located?
Katherine Grosner practices at 30 S Cayuga Rd, Williamsville, NY 14221. The listed phone number is (716) 632-1088.
What is Katherine Grosner's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Katherine Grosner enrolled in Medicare?
Yes. Katherine Grosner 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 Katherine Grosner's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Grosner reassigns Medicare benefits to 3 organizations: Northtowns Ambulatory Surgery Center, LLC (Williamsville, NY), Ambulatory Medical Anesthesia Service, PC (Amherst, NY) and Maple Gate Anesthesiologists, P.C. (Cheektowaga, NY). 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 Katherine Grosner's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Katherine Grosner affiliated with any hospitals?
According to CMS data, Katherine Grosner is affiliated with Kaleida Health.
When was this NPI record last updated?
The NPPES record for Katherine Grosner was last updated on April 21, 2021. 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.
# Katherine Marina Grosner · NPI 1427630243
Nurse Anesthetist, Certified Registered physician in Williamsville, New York. Individual provider, active in the CMS NPPES registry since April 21, 2021.
## Identity
- **NPI:** 1427630243 (Entity type: Individual)
- **Enumerated:** April 21, 2021
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** 673311-1 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 30 S CAYUGA RD, Williamsville, NY 14221-6728
- **Phone:** (716) 632-1088
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Northtowns Ambulatory Surgery Center, LLC (NPI 1073384855, Williamsville, NY); Ambulatory Medical Anesthesia Service, PC (NPI 1609813583, Amherst, NY); Maple Gate Anesthesiologists, P.C. (NPI 1528072709, Cheektowaga, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2021
## Record status
- **NPPES last updated:** April 21, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1427630243) · Data from the CMS NPPES public registry.