Diana Beth Koss, MD
Internal Medicine Physician · Scottsdale, AZ
Diana Beth Koss, MD is an internal medicine physician with a practice address in Scottsdale, Arizona, and NPI 1952353807, issued on May 17, 2006. Check the license (Arizona 29375, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Diana Beth Koss
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 29375 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 8328 E. Hartford Dr., Scottsdale, AZ 85255
- Phone
- (480) 214-9720
- Enumerated
- May 17, 2006
- Record last updated
- Feb 4, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (480) 214-9722
- Medicaid ID
- 630146 AZ
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 8328 E. Hartford Dr.
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diana Beth Koss in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 29375Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
57 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 77% of claims.
Most prescribed
- Lantus Solostar43 claims
- Niacin Er12 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.
Diana Beth Koss among 2,853 internal medicine physician records in Arizona
Diana Beth Koss, MD is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2014 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
344 internal medicine physician records list a practice address in Scottsdale
They are 344 of the 11,008 NPPES records with a practice address in Scottsdale, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Scottsdale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Harjinder Bal, MDScottsdale, AZ 852551912182221
- Jason Buchwald, M.D.Scottsdale, AZ 852551285675439
- John Carroll, MDScottsdale, AZ 852551063468932
- Efren Casanova, M.D.Scottsdale, AZ 852551184717704
- Gina Conflitti, M.D.Scottsdale, AZ 852551134251408
- Alberto Guerrero, M.D.Scottsdale, AZ 852551427066570
- Gwendoline Ladha, MDScottsdale, AZ 852551770510430
- Eleanor Mariano, M.D.Scottsdale, AZ 852551588616734
Common questions
What is Diana Beth Koss, MD's NPI number?
Diana Beth Koss, MD's National Provider Identifier (NPI) is 1952353807, issued on May 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Diana Beth Koss, MD located?
The NPPES record lists a practice address at 8328 E. Hartford Dr., Scottsdale, AZ, 85255. Phone: (480) 214-9720. Providers update this record themselves, so call before visiting.
How can I verify Diana Beth Koss, MD's license?
NPPES lists Arizona license number 29375, 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 Diana Beth Koss, MD prescribe under Medicare Part D?
In 2024, Diana Beth Koss, MD had 57 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
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.