WALTER GRENELL JR. DO
NPI 1669714994
Emergency Medicine - Emergency Medical Services in Wheat Ridge, CO
About Walter Grenell Jr. Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WALTER GRENELL JR. DO (NPI 1669714994) is an individual emergency medical services provider in Wheat Ridge, Colorado, licensed in Colorado (0056486) and active in the NPI registry since March 2013. He is enrolled in Medicare PECOS, is affiliated with Bsa Hospital, and maintains a secondary practice location in Soldotna.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
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
Walter Grenell Jr. Do 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
6Medicare enrollment records show Walter Grenell reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Loveland, CO 80538
- Reassigned Medicare billing, Colorado enrollment
- 111 clinicians in this Medicare group
Gainesville, TX 76240
- Reassigned Medicare billing, Texas enrollment
- 1,193 clinicians in this Medicare group
Soldotna, AK 99669
- Reassigned Medicare billing, Alaska enrollment
- 129 clinicians in this Medicare group
Honokaa, HI 96727
- Reassigned Medicare billing, Hawaii enrollment
- 45 clinicians in this Medicare group
Pahala, HI 96777
- Reassigned Medicare billing, Hawaii enrollment
- 208 clinicians in this Medicare group
Kailua, HI 96734
- Reassigned Medicare billing, Hawaii enrollment
- 206 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Bsa Hospital
Acute Care Hospitals · Amarillo, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 80033 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.
WHEAT RIDGE, CO 80033
WHEAT RIDGE, CO 80033
WHEAT RIDGE, CO 80033
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 Walter Grenell's NPI number?
The NPI number for Walter Grenell is 1669714994. It was assigned to this individual provider in the NPPES registry on March 25, 2013.
Where is Walter Grenell located?
Walter Grenell practices at 8300 W 38th Ave, Wheat Ridge, CO 80033. The listed phone number is (303) 425-4500.
What is Walter Grenell's specialty?
The primary specialty registered for this NPI is Emergency Medicine, specializing in Emergency Medical Services, with taxonomy code 207PE0004X.
Is Walter Grenell enrolled in Medicare?
Yes. Walter Grenell 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 Walter Grenell's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Walter Grenell reassigns Medicare benefits to 6 organizations: Emergency Professionals Of Colorado, PC (Loveland, CO), Acs Primary Care Physicians Southwest, PA (Gainesville, TX), Central Peninsula General Hospital Inc (Soldotna, AK), Honokaa Hospital & Skilled Nursing (Honokaa, HI), Kau Hospital (Pahala, HI) and 1 more organization, listed in the Medicare section above. 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 Walter Grenell's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Walter Grenell accept?
Health plans from Blue Cross and Blue Shield of Texas and Kaiser Permanente list Walter Grenell as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Walter Grenell affiliated with any hospitals?
According to CMS data, Walter Grenell is affiliated with Bsa Hospital.
When was this NPI record last updated?
The NPPES record for Walter Grenell was last updated on September 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Walter Grenell Jr., DO · NPI 1669714994
Emergency Medical Services physician in Wheat Ridge, Colorado. Individual provider, active in the CMS NPPES registry since March 25, 2013.
## Identity
- **NPI:** 1669714994 (Entity type: Individual)
- **Enumerated:** March 25, 2013
- **Primary specialty:** Emergency Medicine - Emergency Medical Services · taxonomy 207PE0004X
- **State license:** 0056486 (Colorado)
- **Sole proprietor:** No
## Practice location
- **Address:** 8300 W 38TH AVE, Wheat Ridge, CO 80033-6005
- **Phone:** (303) 425-4500
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Emergency Professionals Of Colorado, PC (NPI 1396496469, Loveland, CO); Acs Primary Care Physicians Southwest, PA (NPI 1538101019, Gainesville, TX); Central Peninsula General Hospital Inc (NPI 1598063539, Soldotna, AK); Honokaa Hospital & Skilled Nursing (NPI 1164506317, Honokaa, HI); Kau Hospital (NPI 1982276127, Pahala, HI); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** September 23, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1669714994) · Data from the CMS NPPES public registry.