Walter Grenell, DO
Emergency Medical Services (Emergency Medicine) Physician · Wheat Ridge, CO
Walter Grenell, DO is an emergency medical services (emergency medicine) physician with a practice address in Wheat Ridge, Colorado, and NPI 1669714994, issued on Mar 25, 2013. Check the license (Colorado 0056486, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Walter Grenell
- Credential
- DO
- Primary taxonomy
- Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
- License numbers
- 0056486 CO
200431 AK
W0917 TX
Self-reported in NPPES; status is on the state search - Practice location
- 8300 W 38TH Ave, Wheat Ridge, CO 80033
- Phone
- (303) 425-4500
- Enumerated
- Mar 25, 2013
- Record last updated
- Sep 23, 2025
- Medicare enrollment
- Enrolled (PECOS I20190107000849); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medical services (emergency medicine) physician records → All 68 in Colorado → Look up another NPI →
Also registered at 8300 W 38TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Rebecca Althouse, PAMedical Physician Assistant1740299064
- Dianne Ansari Winn, MDAnesthesiology Physician1396720298
- Kerry Arellana, NPCritical Care Neonatal Nurse Practitioner1396040044
- Lee Anne Auerhan, M.D.Anesthesiology Physician1437196094
- Elin Bartell, MDEmergency Medical Services (Emergency Medicine) Physician1548272354
Verify Walter Grenell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 0056486Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average emergency medical services (emergency medicine) physician in 2024
57 Medicare Part D claims for 41 beneficiaries, against an average of 292 among the 1,653 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 92.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Central Peninsula General Hospital IncSoldotna, AK
- Hawaii Emergency Physicians Associated IncHilo, HI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Walter Grenell among 68 emergency medical services (emergency medicine) physician records in Colorado
Walter Grenell, DO is one of 68 emergency medical services (emergency medicine) physician records with a practice address in Colorado. 60% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 81% of them.
- NPI issued2013 · 81% of these records are older, 18% newer
- In a Medicare fileYes · 60% of these records are
- In the CMS Doctors and Clinicians fileYes · 34% of these records are
- Graduated2013 · median 1999 among the 23 with a school on file
- Record last updated2025 · 71% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medical Services (Emergency Medicine) Physician providers in Colorado
There are 68 emergency medical services (emergency medicine) physician records in Colorado.
All 68 in Colorado → Every provider in Wheat Ridge → Emergency Medical Services (Emergency Medicine) Physician nationwide →
The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes
- Jeffrey Beckman, MDWheat Ridge, CO 800331184634925
- Thomas Burke, MDWheat Ridge, CO 800331568400315
- Steve Doerr, MDWheat Ridge, CO 800331093764326
- Joanne Edney, M.D.Wheat Ridge, CO 800331811907298
- Christina Johnson, M.D.Wheat Ridge, CO 800331063462125
- Homi Kapadia, M.D.Wheat Ridge, CO 800331760491369
- Ronald Keller, M.D.Wheat Ridge, CO 800331316903701
- Joseph Lauro, M.D.Wheat Ridge, CO 800331720037112
Common questions
What is Walter Grenell, DO's NPI number?
Walter Grenell, DO's National Provider Identifier (NPI) is 1669714994, issued on Mar 25, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Walter Grenell, DO located?
The NPPES record lists a practice address at 8300 W 38TH Ave, Wheat Ridge, CO, 80033. Phone: (303) 425-4500. Providers update this record themselves, so call before visiting.
How can I verify Walter Grenell, DO's license?
NPPES lists Colorado license number 0056486, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Walter Grenell, DO prescribe under Medicare Part D?
In 2024, Walter Grenell, DO had 57 Medicare Part D claims for 41 beneficiaries; the average among emergency medical services (emergency medicine) physician prescribers was 292. Part D covers Medicare prescriptions only.
What is Walter Grenell, DO's MIPS final score?
The 2023 MIPS final score is 92.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.