WILLIAM ARTHUR GRASS ARNP
NPI 1407854383
Nurse Practitioner - Critical Care Medicine in Creve Coeur, MO
About William Arthur Grass Arnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM ARTHUR GRASS ARNP (NPI 1407854383) is an individual critical care medicine provider in Creve Coeur, Missouri, licensed in Florida (ARNP9207097) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
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 (PECOS)
William Arthur Grass Arnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show William Grass reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Cape Coral, FL 33914
- Reassigned Medicare billing, Florida enrollment
- 880 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63141 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
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 William Grass's NPI number?
The NPI number for William Grass is 1407854383. It was assigned to this individual provider in the NPPES registry on July 13, 2005.
Where is William Grass located?
William Grass practices at 10 Barnes West Dr, Creve Coeur, MO 63141. The listed phone number is (314) 996-8270.
What is William Grass's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Critical Care Medicine, with taxonomy code 363LC0200X.
Is William Grass enrolled in Medicare?
Yes. William Grass is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for William Grass's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Grass reassigns Medicare benefits to Florida Cancer Specialists & Research Institute, LLC (Cape Coral, FL). The 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 William Grass'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 William Grass was last updated on July 30, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months 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.
# William Arthur Grass, ARNP · NPI 1407854383
Critical Care Medicine physician in Creve Coeur, Missouri. Individual provider, active in the CMS NPPES registry since July 13, 2005.
## Identity
- **NPI:** 1407854383 (Entity type: Individual)
- **Enumerated:** July 13, 2005
- **Primary specialty:** Nurse Practitioner - Critical Care Medicine · taxonomy 363LC0200X
- **State license:** ARNP9207097 (Florida)
- **Sole proprietor:** No
## Practice location
- **Address:** 10 BARNES WEST DR, Creve Coeur, MO 63141-6287
- **Phone:** (314) 996-8270
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Florida Cancer Specialists & Research Institute, LLC (NPI 1760590962, Cape Coral, FL), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 30, 2025
- **Other identifiers:** Other Y061EY (FL); Medicaid 308331400 (FL)
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Source: [NPI Profile](https://npiprofile.com/npi/1407854383) · Data from the CMS NPPES public registry.