Dr. Derek J. Timmermann, MD
- Medicare services, 2024
- 488
- Medicare patients, 2024
- 466
- Part D claims, 2024
- 240
- MIPS score, 2024
- 93
- Hospital affiliations
- 1
- Practice address
- 5666 East State Street, Rockford, IL 61108
- Practice phone
- Call (815) 226-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Timmermann's professional email, personal email and mobile number
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Dr. Derek J. Timmermann is an emergency medicine physician in Rockford, Illinois
Dr. Timmermann practices at OSF Saint Anthony Medical Center in Rockford, Illinois, part of OSF HealthCare System.
Dr. Timmermann's NPI, 1649213141, was assigned on June 13, 2006. Dr. Timmermann graduated from Stanford University School of Medicine in 2000. Dr. Timmermann holds Illinois license 036.118970.
- NPI
- 1649213141NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3971520289
- NPI enumeration date
- June 13, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (815) 226-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Derek J. Timmermann practices at OSF Saint Anthony Medical Center in Rockford, Illinois
Dr. Timmermann's primary practice is OSF Saint Anthony Medical Center, at 5666 East State Street, Rockford, IL 61108 in Winnebago County. The practice phone is (815) 226-2000.
- OSF Saint Anthony Medical Center5666 East State Street, Rockford, IL 61108 · Winnebago CountyPhone(815) 226-2000
Source: Dmand AI Affiliation Data
Dr. Derek J. Timmermann is affiliated with 1 site of care and 1 medical group
Dr. Timmermann's primary practice is OSF Saint Anthony Medical Center in Rockford, Illinois, part of OSF HealthCare System. The medical group on file is CEP America.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Derek J. Timmermann's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Timmermann practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| OSF Saint Anthony Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Derek J. Timmermann is one of 2,385 emergency medicine physicians in Illinois
Emergency medicine is Dr. Timmermann's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Timmermann is licensed in Illinois.
Specialties and state licenses
- Emergency medicine, IllinoisPrimary
Emergency medicine physicians near Dr. Timmermann
Counts of emergency medicine physicians with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Derek J. Timmermann billed Medicare for 488 services in 2024
CMS data shows 488 Medicare services from Dr. Timmermann across 3 procedure codes in 2024, for 466 Medicare patients. Medicare paid $66,481 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Timmermann's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6452024: 48824%
- Tests and treatments
- 2023: 212024: 0100%
Dr. Timmermann compared with the Illinois median for emergency medicine physicians, 2024
- Dr. Timmermann
- Illinois median
- Medicare services
- 488vs 27478% above
- Medicare patients
- 466vs 27371% above
- Part D claims
- 140vs 453.1 times
Medians across 2,281 emergency medicine physicians in Illinois with Dmand AI profiles that report each measure.
Dr. Timmermann's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Timmermann and other emergency medicine physicians in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Derek J. Timmermann treated 466 Medicare patients in 2024, average age 75
CMS counts 466 Medicare patients who saw Dr. Timmermann in 2024. The largest group is 75 to 84, with 168 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 28% are also on Medicaid. Their average risk score is 2.30, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Timmermann's median patient age at 69, with 57% women.
Dr. Timmermann's Medicare patients by age, 2024
Dr. Timmermann's Medicare patients by sex, 2024
- Women25655%
- Men21045%
Chronic conditions among Dr. Timmermann's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis57%
- Heart failure46%
- Chronic kidney disease45%
- Ischemic heart disease44%
- Diabetes43%
- Mood disorders42%
Share of Medicare patients with each condition. A patient can have several.
Dr. Timmermann's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Derek J. Timmermann wrote 240 Medicare Part D claims in 2024
In 2024, Dr. Timmermann wrote 240 Medicare Part D claims for 176 patients. 94% of them were for generic drugs. CMS names the drug for 140 of them, across 6 drugs with 11 or more claims each, at $582 in total drug cost. In 2023, CMS named 188 claims across 8 drugs.
Dr. Timmermann's Part D claims by kind of drug, 2024
- Generic226 claims94%
- Brand-name14 claims6%
Dr. Timmermann's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Timmermann's Part D claims, 2024
- Opioids22%52 of 240 claims
- Antibiotics25%61 of 240 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1882024: 14026%
Drugs named by CMS: 6 in 2024, 8 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Derek J. Timmermann scored 93 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Timmermann for performance year 2024, reported as part of a group. Dr. Timmermann accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Timmermann's MIPS scores, performance year 2024
- 93of 100Final score
- 86.8of 100Quality
- 40of 100Improvement Activities
- 77of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Derek J. Timmermann received $18 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Timmermann from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Bristol-Myers Squibb Company paid the most, $18.
Companies that paid Dr. Timmermann the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Derek J. Timmermann graduated from Stanford University School of Medicine
Dr. Timmermann graduated from Stanford University School of Medicine in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Derek J. Timmermann's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Derek J. Timmermann
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Derek J. Timmermann's NPI number?
Dr. Derek J. Timmermann's NPI number is 1649213141. It was assigned on June 13, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Derek J. Timmermann?
Dr. Derek J. Timmermann is an emergency medicine physician in Rockford, Illinois. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Derek J. Timmermann practice?
Dr. Timmermann practices at 5666 East State Street, Rockford, IL 61108. Dr. Timmermann's primary practice is OSF Saint Anthony Medical Center in Rockford, Illinois, part of OSF HealthCare System.
What is Dr. Derek J. Timmermann's office phone number?
The practice phone on file for Dr. Timmermann is (815) 226-2000.
What is Dr. Derek J. Timmermann's medical license number?
Dr. Timmermann holds Illinois license 036.118970.
Which hospitals is Dr. Derek J. Timmermann affiliated with?
Dr. Timmermann practices at OSF Saint Anthony Medical Center in Rockford, Illinois.
What medical group is Dr. Derek J. Timmermann part of?
Dr. Timmermann is linked to CEP America.
Does Dr. Derek J. Timmermann accept Medicare?
Yes. CMS data shows Dr. Timmermann billed Medicare for 488 services in 2024, and Dr. Timmermann accepts Medicare assignment.
What is Dr. Derek J. Timmermann's MIPS score?
Dr. Timmermann's MIPS final score for performance year 2024 is 93 out of 100, reported as part of a group.
How many Medicare patients does Dr. Derek J. Timmermann see?
CMS counts 466 Medicare patients who saw Dr. Timmermann in 2024, with an average age of 75.
Show 5 more questionsShow fewer questions
What services does Dr. Derek J. Timmermann bill to Medicare?
In 2024, Dr. Timmermann's most billed Medicare services were emergency department visit (99285), critical care (99291) and emergency department visit (99284).
Where did Dr. Derek J. Timmermann go to medical school?
Dr. Timmermann graduated from Stanford University School of Medicine in 2000.
What drugs does Dr. Derek J. Timmermann prescribe most?
In 2024 Medicare Part D data, Dr. Timmermann's most prescribed drugs by claims were Hydrocodone-Acetaminophen, Cephalexin and Ondansetron ODT.
Has Dr. Derek J. Timmermann received payments from drug or device companies?
CMS Open Payments shows $18 in general payments to Dr. Timmermann from 1 company from 2016 to 2016. The largest total came from Bristol-Myers Squibb Company.
How long has Dr. Derek J. Timmermann been practicing?
Dr. Timmermann graduated from medical school in 2000, 26 years ago.
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