Elizabeth A. Bay, MD
Internal Medicine Physician · Phoenix, AZ
Elizabeth A. Bay, MD is an internal medicine physician with a practice address in Phoenix, Arizona, and NPI 1962847517, issued on May 8, 2013. Check the license (Arizona R73819, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Elizabeth A. Bay
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- R73819 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 1111 E. Mcdowell RD., Phoenix, AZ 85006
- Phone
- (602) 839-2296
- Enumerated
- May 8, 2013
- Record last updated
- May 8, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (602) 839-2084
- Medicare enrollment
- Enrolled (PECOS I20180206000765); accepts Medicare assignment
- Medical or professional school
- University Of Nebraska College Of Medicine, 2013
- Entity
- Type 1 · individual
Also registered at 1111 E. Mcdowell RD.
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hanna St. Denis-Katz, MDPlastic and Reconstructive Surgery Physician1770375701
Verify Elizabeth A. Bay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license R73819Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
15 Medicare Part D claims, against an average of 3,176 among the 108,855 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): 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 2 group practices
- Aligned Medical Providers LLCPeoria, AZ
- Northern Arizona Healthcare CorporationFlagstaff, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
695 internal medicine physician records list a practice address in Phoenix
They are 695 of the 31,399 NPPES records with a practice address in Phoenix, and 2,853 internal medicine physician records in Arizona.
All 695 in Phoenix → All 2,853 in Arizona → Every provider in Phoenix →
Other internal medicine physician records in Arizona
- Daniel Aaronson, MDTucson, AZ1134865355
- Constantia Abarikwu, MDPhoenix, AZ1497832620
- Jaber Abawi, MDPayson, AZ1629038542
- Demsas Abay, MDPeoria, AZ1720312390
- Firas Abbas, M.D. M.P.H.Mesa, AZ1336481407
- Hassan Abbas, D.O.Mesa, AZ1477294775
- Jalal Abbas, M.D.Sun City West, AZ1205895034
- Tayeb Abbas, MDSun City West, AZ1093406795
- Hamed Abbaszadegan, MDPhoenix, AZ1407083579
- Kristopher Abbate, MDTucson, AZ1184112401
Common questions
What is Elizabeth A. Bay, MD's NPI number?
Elizabeth A. Bay, MD's National Provider Identifier (NPI) is 1962847517, issued on May 8, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Elizabeth A. Bay, MD located?
The NPPES record lists a practice address at 1111 E. Mcdowell RD., Phoenix, AZ, 85006. Phone: (602) 839-2296. Providers update this record themselves, so call before visiting.
How can I verify Elizabeth A. Bay, MD's license?
NPPES lists Arizona license number R73819, 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 Elizabeth A. Bay, MD prescribe under Medicare Part D?
In 2024, Elizabeth A. Bay, MD had 15 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Elizabeth A. Bay, MD'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.