Christopher M. Nielsen, M.D.
Emergency Medicine Physician · Rockford, IL
Christopher M. Nielsen, M.D. is an emergency medicine physician with a practice address in Rockford, Illinois, and NPI 1043280811, issued on Jan 25, 2006. Check the license (Illinois 036-126617, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Christopher M. Nielsen
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- 036-126617 IL
44558 WI
Self-reported in NPPES; status is on the state search - Practice location
- 5666 East State Street, Rockford, IL 61108
- Phone
- (815) 226-2000
- Enumerated
- Jan 25, 2006
- Record last updated
- Feb 10, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (608) 826-2710
- Medicaid ID
- 34253900 WI
- Medicare enrollment
- Enrolled (PECOS I20101019000429); accepts Medicare assignment
- Medical or professional school
- University Of North Dakota School Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 3,291 in Illinois → Look up another NPI →
Also registered at 5666 East State Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Christopher M. Nielsen 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 036-126617Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% fewer Medicare Part D claims than the average emergency medicine physician in 2024
146 Medicare Part D claims for 103 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 11 claims were for opioids.
Most prescribed
- Cefdinir26 claims
- Prednisone13 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
- Emergency Medicine Associates OF Madison, SCMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christopher M. Nielsen among 3,291 emergency medicine physician records in Illinois
Christopher M. Nielsen, M.D. is one of 3,291 emergency medicine physician records with a practice address in Illinois. 80% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 68% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated1999 · median 2012 among the 1,867 with a school on file
- Record last updated2011 · 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 207P00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
53 emergency medicine physician records list a practice address in Rockford
They are 53 of the 3,893 NPPES records with a practice address in Rockford, and 3,291 emergency medicine physician records in Illinois.
All 3,291 in Illinois → Every provider in Rockford → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Jermaine Bridges, MDRockford, IL 611081851612139
- Timothy Coggin, M.D.Rockford, IL 611081154453454
- Mohsin Jafri, D.O.Rockford, IL 611081689009516
- Brett Polan, DORockford, IL 611081831764828
- Brandon Popp, DORockford, IL 611081508560863
- Prakriti Shah, D.O.Rockford, IL 611081578754354
- Faizan ShakeelRockford, IL 611081093155772
- Derek Timmermann, M.D.Rockford, IL 611081649213141
Common questions
What is Christopher M. Nielsen, M.D.'s NPI number?
Christopher M. Nielsen, M.D.'s National Provider Identifier (NPI) is 1043280811, issued on Jan 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher M. Nielsen, M.D. located?
The NPPES record lists a practice address at 5666 East State Street, Rockford, IL, 61108. Phone: (815) 226-2000. Providers update this record themselves, so call before visiting.
How can I verify Christopher M. Nielsen, M.D.'s license?
NPPES lists Illinois license number 036-126617, 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 Christopher M. Nielsen, M.D. prescribe under Medicare Part D?
In 2024, Christopher M. Nielsen, M.D. had 146 Medicare Part D claims for 103 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.