Nathan Rex Duffin, D.O.
Internal Medicine Physician · Mesa, AZ
Nathan Rex Duffin, D.O. is an internal medicine physician with a practice address in Mesa, Arizona, and NPI 1497016190, issued on May 30, 2012. Check the license (Arizona 006636, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Nathan Rex Duffin
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 006636 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 1301 S Crismon RD, Mesa, AZ 85209
- Phone
- (602) 708-2599
- Enumerated
- May 30, 2012
- Record last updated
- Feb 24, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20150603002592); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 1301 S Crismon RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Nathan Rex Duffin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 006636Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average internal medicine physician in 2024
800 Medicare Part D claims for 93 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium75 claims
- Tamsulosin Hcl40 claims
- Lisinopril35 claims
- Levothyroxine Sodium27 claims
- Metformin Hcl24 claims
- Amlodipine Besylate22 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.
Industry payments in 2024: $112.19
2 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Pulmonary Consultants P.C.Mesa, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathan Rex Duffin among 2,853 internal medicine physician records in Arizona
Nathan Rex Duffin, D.O. 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 2012, is newer than 64% of them.
- NPI issued2012 · 64% of these records are older, 34% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2006 · median 2003 among the 1,643 with a school on file
- Record last updated2015 · 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).
157 internal medicine physician records list a practice address in Mesa
They are 157 of the 9,151 NPPES records with a practice address in Mesa, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Mesa → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ankur Bant, M.D.Mesa, AZ 852091164544979
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- Travis Fisher, MDMesa, AZ 852091366536732
- Nicholas Harrell, M.D.Mesa, AZ 852091467795617
- Bassam Hattab, M.D.Mesa, AZ 852091023420189
- Joshua Jalad, MDMesa, AZ 852091508200445
- Sujit Magiyawala, MDMesa, AZ 852091336109131
- Kamakshi Mukkavilli, MDMesa, AZ 852091508983644
Common questions
What is Nathan Rex Duffin, D.O.'s NPI number?
Nathan Rex Duffin, D.O.'s National Provider Identifier (NPI) is 1497016190, issued on May 30, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Nathan Rex Duffin, D.O. located?
The NPPES record lists a practice address at 1301 S Crismon RD, Mesa, AZ, 85209. Phone: (602) 708-2599. Providers update this record themselves, so call before visiting.
How can I verify Nathan Rex Duffin, D.O.'s license?
NPPES lists Arizona license number 006636, 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 Nathan Rex Duffin, D.O. prescribe under Medicare Part D?
In 2024, Nathan Rex Duffin, D.O. had 800 Medicare Part D claims for 93 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.