Michael R. Gray, M.D.
Internal Medicine Physician · Benson, AZ
Michael R. Gray, M.D. is an internal medicine physician with a practice address in Benson, Arizona, and NPI 1639120520, issued on May 15, 2006. Check the license (Arizona 11623, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Michael R. Gray
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 11623 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 300 S Ocotillo Ave, Benson, AZ 85602
- Phone
- (520) 586-9111
- Enumerated
- May 15, 2006
- Record last updated
- Jun 18, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (520) 586-9091
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 300 S Ocotillo Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Craig Ottenstein, MDInternal Medicine Physician1275658064
Verify Michael R. Gray in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 11623Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
503 Medicare Part D claims for 39 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 97 claims were for opioids.
Most prescribed
- Levothyroxine Sodium41 claims
- Albuterol Sulfate Hfa30 claims
- Oxycodone Hcl27 claims
- Cyanocobalamin Injection24 claims
- Morphine Sulfate Er24 claims
- Lisinopril22 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.
Michael R. Gray among 2,853 internal medicine physician records in Arizona
Michael R. Gray, M.D. 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 updated2013 · 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).
5 internal medicine physician records list a practice address in Benson
They are 5 of the 95 NPPES records with a practice address in Benson, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Benson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Cassandra Harrison, M.D.Benson, AZ 856021992874606
- Craig Ottenstein, MDBenson, AZ 856021275658064
- Kalpana Pandit, M.D.Benson, AZ 856021033139357
- Glenn Robertson, MDBenson, AZ 856021174533509
- W Coghlan, MDBisbee, AZ 856031366405995
- Kathleen Jones, M.D.Bisbee, AZ 856031093793150
- Coralee McKay, M.D., F.A.C.P.Bisbee, AZ 856031720146178
- Hector Garcia, MDDouglas, AZ 856071174699649
Common questions
What is Michael R. Gray, M.D.'s NPI number?
Michael R. Gray, M.D.'s National Provider Identifier (NPI) is 1639120520, issued on May 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael R. Gray, M.D. located?
The NPPES record lists a practice address at 300 S Ocotillo Ave, Benson, AZ, 85602. Phone: (520) 586-9111. Providers update this record themselves, so call before visiting.
How can I verify Michael R. Gray, M.D.'s license?
NPPES lists Arizona license number 11623, 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 Michael R. Gray, M.D. prescribe under Medicare Part D?
In 2024, Michael R. Gray, M.D. had 503 Medicare Part D claims for 39 beneficiaries; 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.