Nathaniel George Grubbs, M.D.
Emergency Medicine Physician · Sedona, AZ
Nathaniel George Grubbs, M.D. is an emergency medicine physician with a practice address in Sedona, Arizona, and NPI 1598108110, issued on Apr 12, 2013. Check the license (Arizona 54828, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Nathaniel George Grubbs
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 54828 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 3700 W State Route 89A, Sedona, AZ 86336
- Phone
- (928) 204-4100
- Enumerated
- Apr 12, 2013
- Record last updated
- Aug 9, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (928) 204-4115
- Medicare enrollment
- Enrolled (PECOS I20171031000340); accepts Medicare assignment
- Medical or professional school
- University Of Rochester School Of Medicine And Dentistry, 2013
- Entity
- Type 1 · individual
Also registered at 3700 W State Route 89A
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Nicholas Kanaan, M.D.Emergency Medicine Physician1831423235
- Alexandria Kirkpatrick, A-GNP-CNurse Practitioner1760109482
- Allison Kirshner, NPNurse Practitioner1821182429
Verify Nathaniel George Grubbs in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 54828Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average emergency medicine physician in 2024
31 Medicare Part D claims for 25 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Most prescribed
- Cephalexin11 claims
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): 77 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 one group practice
- Flagstaff Emergency PhysiciansFlagstaff, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
8 emergency medicine physician records list a practice address in Sedona
They are 8 of the 331 NPPES records with a practice address in Sedona, and 1,494 emergency medicine physician records in Arizona.
All 8 in Sedona → All 1,494 in Arizona → Every provider in Sedona →
Other emergency medicine physician records in Arizona
- Dimyana Abdelmalek, MDChinle, AZ1194012146
- Linda Abernathy, MDTuba City, AZ1386687093
- Sameer Aboufadel, DO, MPHTucson, AZ1639063431
- Josephine Acuna, M.DTucson, AZ1710325287
- Norberto Adame, MDPhoenix, AZ1144276213
- Bruce Adams, M.D.Mesa, AZ1801824925
- Ryan Adkins, D.O.Chandler, AZ1417483538
- Geovar Agbayani, DOKingman, AZ1265016646
- Sophia Aguirre, MDPhoenix, AZ1285384859
- Murtaza AkhterPhoenix, AZ1093032351
Common questions
What is Nathaniel George Grubbs, M.D.'s NPI number?
Nathaniel George Grubbs, M.D.'s National Provider Identifier (NPI) is 1598108110, issued on Apr 12, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Nathaniel George Grubbs, M.D. located?
The NPPES record lists a practice address at 3700 W State Route 89A, Sedona, AZ, 86336. Phone: (928) 204-4100. Providers update this record themselves, so call before visiting.
How can I verify Nathaniel George Grubbs, M.D.'s license?
NPPES lists Arizona license number 54828, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Nathaniel George Grubbs, M.D. prescribe under Medicare Part D?
In 2024, Nathaniel George Grubbs, M.D. had 31 Medicare Part D claims for 25 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Nathaniel George Grubbs, M.D.'s MIPS final score?
The 2023 MIPS final score is 77 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.