Derek A. Melby, DO
Internal Medicine Physician · South Holland, IL
Derek A. Melby, DO is an internal medicine physician with a practice address in South Holland, Illinois, and NPI 1033266473, issued on Jan 5, 2007. Check the license (Illinois 036145502, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Derek A. Melby
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036145502 IL
Self-reported in NPPES; status is on the state search - Practice location
- 100 W 162ND St, South Holland, IL 60473
- Phone
- (708) 730-2200
- Enumerated
- Jan 5, 2007
- Record last updated
- May 30, 2023
- Fax
- (708) 210-0625
- Medicaid ID
- 036145502 IL
- Medicare enrollment
- Enrolled (PECOS I20191203001343); accepts Medicare assignment
- Medical or professional school
- Midwestern University, Chicago College Of Osteopathic Med, 1995
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 100 W 162ND St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Chirayu Baxi, MDHospitalist Physician1326434994
Verify Derek A. Melby 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 036145502Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
82% fewer Medicare Part D claims than the average internal medicine physician in 2024
577 Medicare Part D claims for 197 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 28 claims were for opioids.
Most prescribed
- Metoprolol Succinate44 claims
- Atorvastatin Calcium31 claims
- Spironolactone28 claims
- Pantoprazole Sodium27 claims
- Amlodipine Besylate26 claims
- Eliquis22 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
- Advocate Health And Hospitals CorporationSouth Holland, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Derek A. Melby among 7,238 internal medicine physician records in Illinois
Derek A. Melby, 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 2007, is newer than 39% of them.
- NPI issued2007 · 39% of these records are older, 55% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1995 · median 2003 among the 3,580 with a school on file
- Record last updated2023 · 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).
18 internal medicine physician records list a practice address in South Holland
They are 18 of the 323 NPPES records with a practice address in South Holland, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in South Holland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Girma Assefa, M.D.South Holland, IL 604731619904992
- Carlos Concepcion, M.D.South Holland, IL 604731194130302
- Kara Davis, MDSouth Holland, IL 604731417991449
- Michelle Harris, M.D.South Holland, IL 604731275553661
- Daniel Montalvo, M.D.South Holland, IL 604731437165594
- Lawrence Okafor, M.D.South Holland, IL 604731285649012
- Praveen Parvathala, M.D.South Holland, IL 604731861409971
- Angela Perry, M.D.South Holland, IL 604731164970141
Common questions
What is Derek A. Melby, DO's NPI number?
Derek A. Melby, DO's National Provider Identifier (NPI) is 1033266473, issued on Jan 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Derek A. Melby, DO located?
The NPPES record lists a practice address at 100 W 162ND St, South Holland, IL, 60473. Phone: (708) 730-2200. Providers update this record themselves, so call before visiting.
How can I verify Derek A. Melby, DO's license?
NPPES lists Illinois license number 036145502, 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 Derek A. Melby, DO prescribe under Medicare Part D?
In 2024, Derek A. Melby, DO had 577 Medicare Part D claims for 197 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.