Leslie Dalaza Mattson, M.D.
Internal Medicine Physician · Bloomingdale, IL
Leslie Dalaza Mattson, M.D. is an internal medicine physician with a practice address in Bloomingdale, Illinois, and NPI 1487975181, issued on Jun 16, 2010. Check the license (Illinois 036131651, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Leslie Dalaza Mattson
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 036131651 IL
036.131651 IL
Self-reported in NPPES; status is on the state search - Practice location
- 220 Springfield Dr Ste 210, Bloomingdale, IL 60108
- Phone
- (630) 510-2609
- Enumerated
- Jun 16, 2010
- Record last updated
- Jun 28, 2024
- Fax
- (630) 539-6049
- Medicare enrollment
- Enrolled (PECOS I20130816000023); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 2010
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 220 Springfield Dr Ste 210
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Leslie Dalaza Mattson 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 036131651Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
78% fewer Medicare Part D claims than the average internal medicine physician in 2024
694 Medicare Part D claims for 311 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 19 claims were for opioids.
Most prescribed
- Amlodipine Besylate34 claims
- Atorvastatin Calcium29 claims
- Pantoprazole Sodium26 claims
- Methylprednisolone25 claims
- Amoxicillin-Clavulanate Potass22 claims
- Azithromycin19 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: $19.86
1 payment: food and beverage; the largest payer was Janssen Pharmaceuticals, 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
- Dupage Medical Group LtdWinfield, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leslie Dalaza Mattson among 7,238 internal medicine physician records in Illinois
Leslie Dalaza Mattson, M.D. 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 2010, is newer than 51% of them.
- NPI issued2010 · 51% of these records are older, 47% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2010 · median 2003 among the 3,580 with a school on file
- Record last updated2024 · 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).
16 internal medicine physician records list a practice address in Bloomingdale
They are 16 of the 638 NPPES records with a practice address in Bloomingdale, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Bloomingdale → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nazneen Ahmed, MDBloomingdale, IL 601081215926621
- Vanja Cuk, MDBloomingdale, IL 601081215022074
- Robert Hurst, MDBloomingdale, IL 601081972579142
- Shazia Khan, MDBloomingdale, IL 601081205869120
- Mandeep Kohli, D.OBloomingdale, IL 601081447286497
- Gerald Maida, MDBloomingdale, IL 601081891762738
- Sunil Matiwala, M.D.Bloomingdale, IL 601081174555601
- Sunnan Moinuddin, MDBloomingdale, IL 601081497140727
Common questions
What is Leslie Dalaza Mattson, M.D.'s NPI number?
Leslie Dalaza Mattson, M.D.'s National Provider Identifier (NPI) is 1487975181, issued on Jun 16, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Leslie Dalaza Mattson, M.D. located?
The NPPES record lists a practice address at 220 Springfield Dr Ste 210, Bloomingdale, IL, 60108. Phone: (630) 510-2609. Providers update this record themselves, so call before visiting.
How can I verify Leslie Dalaza Mattson, M.D.'s license?
NPPES lists Illinois license number 036131651, 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 Leslie Dalaza Mattson, M.D. prescribe under Medicare Part D?
In 2024, Leslie Dalaza Mattson, M.D. had 694 Medicare Part D claims for 311 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.