Aaron G. Coates, MD
Internal Medicine Physician · Rockford, IL
Aaron G. Coates, MD is an internal medicine physician with a practice address in Rockford, Illinois, and NPI 1871603050, issued on Aug 30, 2006. Check the license (Illinois 036-103278, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Aaron G. Coates
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036-103278 IL
Self-reported in NPPES; status is on the state search - Practice location
- 3401 N Perryville RD, Rockford, IL 61114
- Phone
- (815) 971-2000
- Enumerated
- Aug 30, 2006
- Record last updated
- Jan 20, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicaid ID
- 036103278 IL
- Medicare enrollment
- Enrolled (PECOS I20050120000940); accepts Medicare assignment
- Medical or professional school
- Hahnemann University College Of Medicine, 1997
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 3401 N Perryville RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Lynette Castronovo, N.P.Gerontology Nurse Practitioner1821055484
- Michelle Cleveland, NPAdult Health Nurse Practitioner1205261724
- Machelle Dopkins, CCCAudiologist1750300901
- Richard Fellars, MDFamily Medicine Physician1780794974
Verify Aaron G. Coates 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 036-103278Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.8 times the Medicare Part D claims of the average internal medicine physician in 2024
15,269 Medicare Part D claims for 954 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 546 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,047 claims
- Levothyroxine Sodium667 claims
- Losartan Potassium624 claims
- Amlodipine Besylate612 claims
- Hydrochlorothiazide461 claims
- Omeprazole444 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.
Bills Medicare through one group practice
- Rockford Health PhysiciansRockford, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Aaron G. Coates among 7,238 internal medicine physician records in Illinois
Aaron G. Coates, MD 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1997 · median 2003 among the 3,580 with a school on file
- Record last updated2010 · 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).
82 internal medicine physician records list a practice address in Rockford
They are 82 of the 3,893 NPPES records with a practice address in Rockford, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Rockford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Humaira Bari, MDRockford, IL 611141497845135
- Thomas Brefeld, MDRockford, IL 611141699885871
- Daniel Chamberlain, MDRockford, IL 611141396833307
- Venkata Dontaraju, M.D, MRCPRockford, IL 611141821241084
- Daniel Herdeman, MDRockford, IL 611141447293451
- Willard Moore, MDRockford, IL 611141831209022
- Peter Phelan, MDRockford, IL 611141548358534
- Linda Razbadouski, M.D.Rockford, IL 611141538194154
Common questions
What is Aaron G. Coates, MD's NPI number?
Aaron G. Coates, MD's National Provider Identifier (NPI) is 1871603050, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Aaron G. Coates, MD located?
The NPPES record lists a practice address at 3401 N Perryville RD, Rockford, IL, 61114. Phone: (815) 971-2000. Providers update this record themselves, so call before visiting.
How can I verify Aaron G. Coates, MD's license?
NPPES lists Illinois license number 036-103278, 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 Aaron G. Coates, MD prescribe under Medicare Part D?
In 2024, Aaron G. Coates, MD had 15,269 Medicare Part D claims for 954 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.