John C. Maynard, MD
Nephrology Physician · Rockford, IL
John C. Maynard, MD is a nephrology physician with a practice address in Rockford, Illinois, and NPI 1730180878, issued on Aug 10, 2005. Check the license (Illinois 036066422, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John C. Maynard
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 036066422 IL
Self-reported in NPPES; status is on the state search - Practice location
- 612 Roxbury RD, Rockford, IL 61107
- Phone
- (815) 227-8300
- Enumerated
- Aug 10, 2005
- Record last updated
- Apr 22, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (815) 227-8301
- Medicaid IDs
- 30525600 WI
036066422 IL - Medicare enrollment
- Enrolled (PECOS I20050113001026); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 1978
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 572 in Illinois → Look up another NPI →
Also registered at 612 Roxbury RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kathleen Capriola, APNAdult Health Clinical Nurse Specialist1710975891
- Solab Chitrakar, MDInternal Medicine Physician1750934584
- Stephanie Gile, APNNurse Practitioner1598216657
- Jacqueline May, NPNurse Practitioner1699715706
- Muamer Mulasmajic, APNNephrology Physician1326526716
- Charlene Murdakes, MDNephrology Physician1992961593
Verify John C. Maynard 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 036066422Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
31% fewer Medicare Part D claims than the average nephrology physician in 2024
1,004 Medicare Part D claims for 232 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims.
Most prescribed
- Lisinopril145 claims
- Terazosin Hcl104 claims
- Furosemide102 claims
- Calcitriol82 claims
- Losartan Potassium79 claims
- Atenolol49 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
- Rna OF Rockford, PLLCRockford, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John C. Maynard among 572 nephrology physician records in Illinois
John C. Maynard, MD is one of 572 nephrology physician records with a practice address in Illinois. 87% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 88% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated1978 · median 2002 among the 433 with a school on file
- Record last updated2011 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Illinois
There are 572 nephrology physician records in Illinois.
All 572 in Illinois → Every provider in Rockford → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Mashood Ahmad, MDRockford, IL 611071043232846
- Arooj Fatima, M.DRockford, IL 611071720437338
- Stephen KemneleRockford, IL 611071992180806
- Krishna K R Manda, MDRockford, IL 611071558593095
- Muamer Mulasmajic, APNRockford, IL 611071326526716
- Charlene Murdakes, MDRockford, IL 611071992961593
- Joanna Niemiec, MDRockford, IL 611071821016791
- Bindu Pavithran, MDRockford, IL 611071548210677
Common questions
What is John C. Maynard, MD's NPI number?
John C. Maynard, MD's National Provider Identifier (NPI) is 1730180878, issued on Aug 10, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John C. Maynard, MD located?
The NPPES record lists a practice address at 612 Roxbury RD, Rockford, IL, 61107. Phone: (815) 227-8300. Providers update this record themselves, so call before visiting.
How can I verify John C. Maynard, MD's license?
NPPES lists Illinois license number 036066422, 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 John C. Maynard, MD prescribe under Medicare Part D?
In 2024, John C. Maynard, MD had 1,004 Medicare Part D claims for 232 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.