MR. GREGORY V GRIER CRNA
NPI 1215971577
Nurse Anesthetist, Certified Registered in West Chester, PA
About Mr. Gregory V Grier Crna NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MR. GREGORY V GRIER CRNA (NPI 1215971577) is an individual nurse anesthetist, certified registered in West Chester, Pennsylvania, licensed in Pennsylvania (RN302937L) and active in the NPI registry since June 2006.
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 (PECOS)
Mr. Gregory V Grier Crna is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Gregory Grier reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
West Chester, PA 19380
- Reassigned Medicare billing, Pennsylvania enrollment
- 983 clinicians in this Medicare group
West Chester, PA 19380
- Reassigned Medicare billing, Pennsylvania enrollment
- 25 clinicians in this Medicare group
Chadds Ford, PA 19317
- Reassigned Medicare billing, Pennsylvania enrollment
- 251 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.
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 14
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WEST CHESTER, PA 19380
WEST CHESTER, PA 19380
WEST CHESTER, PA 19380
WEST CHESTER, PA 19380
WEST CHESTER, PA 19380
WEST CHESTER, PA 19380
WEST CHESTER, PA 19380
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 Gregory Grier's NPI number?
The NPI number for Gregory Grier is 1215971577. It was assigned to this individual provider in the NPPES registry on June 16, 2006.
Where is Gregory Grier located?
Gregory Grier practices at 701 E Marshall St # 141, West Chester, PA 19380. The listed phone number is (610) 431-5472.
What is Gregory Grier's specialty?
The primary specialty registered for this NPI is Nurse Anesthetist, Certified Registered with taxonomy code 367500000X.
Is Gregory Grier enrolled in Medicare?
Yes. Gregory Grier is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Gregory Grier's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Grier reassigns Medicare benefits to 3 organizations: Clinical Care Associates Of The University Of Pennsylvania Health (West Chester, PA), Wcs Sedation, LLC (West Chester, PA) and Associates In Anesthesia, Inc. (Chadds Ford, PA). 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 Gregory Grier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Gregory Grier was last updated on June 30, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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. Gregory V Grier, CRNA · NPI 1215971577
Nurse Anesthetist, Certified Registered physician in West Chester, Pennsylvania. Individual provider, active in the CMS NPPES registry since June 16, 2006.
## Identity
- **NPI:** 1215971577 (Entity type: Individual)
- **Enumerated:** June 16, 2006
- **Primary specialty:** Nurse Anesthetist, Certified Registered · taxonomy 367500000X
- **State license:** RN302937L (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 701 E MARSHALL ST # 141, West Chester, PA 19380-4412
- **Phone:** (610) 431-5472
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Clinical Care Associates Of The University Of Pennsylvania Health (NPI 1396416251, West Chester, PA); Wcs Sedation, LLC (NPI 1164925558, West Chester, PA); Associates In Anesthesia, Inc. (NPI 1942281191, Chadds Ford, PA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** June 30, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1215971577) · Data from the CMS NPPES public registry.