Andrew Mel Diaz, DO
Internal Medicine Physician · Huntley, IL
Andrew Mel Diaz, DO is an internal medicine physician with a practice address in Huntley, Illinois, and NPI 1255951786, issued on Apr 24, 2020. Check the license (Illinois 036164669, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Andrew Mel Diaz
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036164669 IL
Self-reported in NPPES; status is on the state search - Practice location
- 10400 Haligus RD, Huntley, IL 60142
- Phone
- (815) 759-4323
- Enumerated
- Apr 24, 2020
- Record last updated
- Apr 16, 2026
- Fax
- (815) 759-4948
- Medicare enrollment
- Enrolled (PECOS I20230828002887); accepts Medicare assignment
- Medical or professional school
- At Still University Of Health Sciences, College Of Osteo Med, Kirksville, 2020
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 10400 Haligus RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Andrew Mel Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036164669Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average internal medicine physician in 2024
378 Medicare Part D claims for 175 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 26 claims were for opioids.
Most prescribed
- Atorvastatin Calcium30 claims
- Eliquis30 claims
- Cephalexin27 claims
- Amlodipine Besylate17 claims
- Pantoprazole Sodium17 claims
- Hydrocodone-Acetaminophen16 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 MIPS final score for 2023 (Medicare payment program): 94.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Northwestern Medical Faculty FoundationHuntley, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrew Mel Diaz among 7,238 internal medicine physician records in Illinois
Andrew Mel Diaz, DO is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 71% of them.
- NPI issued2020 · 71% of these records are older, 26% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2020 · median 2003 among the 3,580 with a school on file
- Record last updated2026 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 internal medicine physician records list a practice address in Huntley
They are 10 of the 372 NPPES records with a practice address in Huntley, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Huntley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ihab Ahmed, MDHuntley, IL 601421740636497
- Shazia Daudi, MDHuntley, IL 601421235137928
- Fred Halloran, MDHuntley, IL 601421568434942
- Jared Ko, M.D.Huntley, IL 601421952369753
- Renata Osadnik, M.D.Huntley, IL 601421902819717
- Piushkumar Patel, M.D.Huntley, IL 601421447254255
- Sandra SchroderHuntley, IL 601421225906662
- Aleksander Tartakovsky, DOHuntley, IL 601421114412087
Common questions
What is Andrew Mel Diaz, DO's NPI number?
Andrew Mel Diaz, DO's National Provider Identifier (NPI) is 1255951786, issued on Apr 24, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Andrew Mel Diaz, DO located?
The NPPES record lists a practice address at 10400 Haligus RD, Huntley, IL, 60142. Phone: (815) 759-4323. Providers update this record themselves, so call before visiting.
How can I verify Andrew Mel Diaz, DO's license?
NPPES lists Illinois license number 036164669, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrew Mel Diaz, DO prescribe under Medicare Part D?
In 2024, Andrew Mel Diaz, DO had 378 Medicare Part D claims for 175 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Andrew Mel Diaz, DO's MIPS final score?
The 2023 MIPS final score is 94.1 of 100. 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.