John Conrad Mastrud, D.D.S.
Dentist · Lemont, IL
John Conrad Mastrud, D.D.S. is a dentist with a practice address in Lemont, Illinois, and NPI 1366577652, issued on Feb 23, 2007. Check the license (Illinois 019-023242, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John Conrad Mastrud
- Credential
- D.D.S.
- Primary taxonomy
- Dentist 122300000X
- License number
- 019-023242 IL
Self-reported in NPPES; status is on the state search - Practice location
- 15947 W 127TH St, Lemont, IL 60439
- Phone
- (630) 257-2133
- Enumerated
- Feb 23, 2007
- Record last updated
- Oct 21, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (630) 257-2146
- Entity
- Type 1 · individual
8 nearest dentist records → All 4,522 in Illinois → Look up another NPI →
Verify John Conrad Mastrud in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 019-023242Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average dentist in 2024
82 Medicare Part D claims for 49 beneficiaries, against an average of 86 among the 51,021 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin55 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: $130.03
2 payments; by number, the most common kind was food and beverage; the largest payer was Ultradent Products Inc. The 31,974 providers of this specialty with any payment received $540.36 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.
John Conrad Mastrud among 4,522 dentist records in Illinois
John Conrad Mastrud, D.D.S. is one of 4,522 dentist records with a practice address in Illinois. 64% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 19% of them.
- NPI issued2007 · 19% of these records are older, 62% newer
- In a Medicare fileYes · 64% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2014 · 74% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 122300000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 dentist records list a practice address in Lemont
They are 11 of the 270 NPPES records with a practice address in Lemont, and 4,522 dentist records in Illinois.
All 4,522 in Illinois → Every provider in Lemont → Dentist nationwide →
The 8 dentist records with the nearest ZIP codes
- Kathleen Barto, D.D.S.Lemont, IL 604391134135320
- Hilary Crotty, DDSLemont, IL 604391932550787
- Beata Dederowski, D.M.D.Lemont, IL 604391265662423
- Jacob Groselak, DMDLemont, IL 604391871136085
- Kelly Janas, DDSBolingbrook, IL 604391316015936
- Stephanie Lemberis, D.M.D.Lemont, IL 604391396090957
- Karolina Mniszak, DMDLemont, IL 604391053962274
- Xhelo Shuaipaj, DDSLemont, IL 604391427111665
Common questions
What is John Conrad Mastrud, D.D.S.'s NPI number?
John Conrad Mastrud, D.D.S.'s National Provider Identifier (NPI) is 1366577652, issued on Feb 23, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Conrad Mastrud, D.D.S. located?
The NPPES record lists a practice address at 15947 W 127TH St, Lemont, IL, 60439. Phone: (630) 257-2133. Providers update this record themselves, so call before visiting.
How can I verify John Conrad Mastrud, D.D.S.'s license?
NPPES lists Illinois license number 019-023242, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does John Conrad Mastrud, D.D.S. prescribe under Medicare Part D?
In 2024, John Conrad Mastrud, D.D.S. had 82 Medicare Part D claims for 49 beneficiaries; the average among dentist prescribers was 86. 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.