Dr. Timothy E. Jessen, MD
- Medicare services, 2024
- 1,101
- Medicare patients, 2024
- 236
- Part D claims, 2024
- 1,328
- MIPS score, 2024
- 87
- Hospital affiliations
- 1
- Practice address
- 421 W Exchange St, Freeport, IL 61032
- Practice phone
- Call (815) 599-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Fhn
Freeport, Illinois
Find Dr. Jessen's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Timothy E. Jessen is an allergist and immunologist in Freeport, Illinois
Dr. Jessen practices at Fhn in Freeport, Illinois.
Dr. Jessen's NPI, 1831165034, was assigned on February 27, 2006. Dr. Jessen graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1983. Dr. Jessen holds Illinois license 036077588.
- NPI
- 1831165034NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0345286621
- NPI enumeration date
- February 27, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (815) 599-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Timothy E. Jessen practices at Fhn in Freeport, Illinois
Dr. Jessen's primary practice is Fhn, at 421 W Exchange St, Freeport, IL 61032 in Stephenson County. The practice phone is (815) 599-6000.
- Fhn421 W Exchange St, Freeport, IL 61032 · Stephenson CountyPhone(815) 599-6000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Timothy E. Jessen is affiliated with 4 sites of care and 2 medical groups
Dr. Jessen's primary practice is Fhn in Freeport, Illinois. Dr. Jessen is also affiliated with Mercyhealth Hospital-Freeport. The medical group on file is Mercyhealth Hospital-Freeport. Dmand AI also links Dr. Jessen to 2 more group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Timothy E. Jessen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Jessen practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Fhn | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Timothy E. Jessen is one of 145 allergists and immunologists in Illinois
Allergy and immunology is Dr. Jessen's primary specialty in the NPI Registry, under taxonomy code 207K00000X. Dr. Jessen is licensed in Illinois.
Specialties and state licenses
- Allergy and immunology, IllinoisPrimary
Allergists and immunologists near Dr. Jessen
Counts of allergists and immunologists 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. Timothy E. Jessen billed Medicare for 1,101 services in 2024
CMS data shows 1,101 Medicare services from Dr. Jessen across 10 procedure codes in 2024, for 236 Medicare patients. Medicare paid $18,140 for them.
Dr. Jessen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 8432024: 8213%
- Office and hospital visits
- 2023: 2092024: 17914%
- Other services
- 2023: 02024: 86
- Surgery
- 2023: 222024: 1532%
- Imaging
- 2023: 132024: 0100%
Where Dr. Jessen's Medicare services took place, 2024
- In an office80273%
- In a facility29927%
Dr. Jessen compared with the Illinois median for allergists and immunologists, 2024
- Dr. Jessen
- Illinois median
- Medicare services
- 1,101vs 90522% above
- Medicare patients
- 236vs 1162.0 times
- Part D claims
- 1,058vs 2464.3 times
Medians across 130 allergists and immunologists in Illinois with Dmand AI profiles that report each measure.
Dr. Jessen'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.
Need commercial claims for Dr. Jessen?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Jessen and other allergists and immunologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Timothy E. Jessen treated 236 Medicare patients in 2024, average age 74
CMS counts 236 Medicare patients who saw Dr. Jessen in 2024. The largest group is 65 to 74, with 96 patients. 73% of them have high blood pressure, and 67% have high cholesterol. 25% are also on Medicaid. Their average risk score is 1.37, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Jessen's median patient age at 66, with 55% women.
Dr. Jessen's Medicare patients by age, 2024
Dr. Jessen's Medicare patients by sex, 2024
- Women14662%
- Men9038%
Chronic conditions among Dr. Jessen's Medicare patients, 2024
- High blood pressure73%
- High cholesterol67%
- Arthritis42%
- Anxiety33%
- Diabetes31%
- COPD29%
- Heart failure26%
- Chronic kidney disease25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Jessen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Timothy E. Jessen wrote 1,328 Medicare Part D claims in 2024
In 2024, Dr. Jessen wrote 1,328 Medicare Part D claims for 205 patients. 64% of them were for generic drugs. CMS names the drug for 1,058 of them, across 33 drugs with 11 or more claims each, at $322,300 in total drug cost. In 2023, CMS named 915 claims across 28 drugs.
Dr. Jessen's Part D claims by kind of drug, 2024
- Generic845 claims64%
- Brand-name and other483 claims36%
Dr. Jessen'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. Jessen's Part D claims, 2024
- Opioids2%20 of 1,328 claims
- Antibiotics8%101 of 1,328 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: 9152024: 1,05816%
Drugs named by CMS: 33 in 2024, 28 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. Timothy E. Jessen scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Jessen for performance year 2024, reported as part of a group. Dr. Jessen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Jessen's MIPS scores, performance year 2024
- 87of 100Final score
- 86.2of 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. Timothy E. Jessen received $4,412 in industry payments from 2016 to 2025
CMS Open Payments shows 279 general payments to Dr. Jessen from 22 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. AstraZeneca Pharmaceuticals LP paid the most, $1,251.
General payments to Dr. Jessen by program year, 2016 to 2025
General payments to Dr. Jessen by kind, 2016 to 2025
- Food and beverage$4,30398%
- Education$1102%
Companies that paid Dr. Jessen the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Timothy E. Jessen graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb)
Dr. Jessen graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Timothy E. Jessen'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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. Timothy E. Jessen
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. Timothy E. Jessen's NPI number?
Dr. Timothy E. Jessen's NPI number is 1831165034. It was assigned on February 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Timothy E. Jessen?
Dr. Timothy E. Jessen is an allergist and immunologist in Freeport, Illinois. The primary specialty in the NPI Registry is Allergy & Immunology Physician (taxonomy code 207K00000X).
Where does Dr. Timothy E. Jessen practice?
Dr. Jessen practices at 421 W Exchange St, Freeport, IL 61032. Dr. Jessen's primary practice is Fhn in Freeport, Illinois. Dmand AI also links Dr. Jessen to 2 group practices and clinics and 1 medical group.
What is Dr. Timothy E. Jessen's office phone number?
The practice phone on file for Dr. Jessen is (815) 599-6000.
What is Dr. Timothy E. Jessen's medical license number?
Dr. Jessen holds Illinois license 036077588.
Which hospitals is Dr. Timothy E. Jessen affiliated with?
Dr. Jessen is affiliated with Mercyhealth Hospital-Freeport.
What medical group is Dr. Timothy E. Jessen part of?
Dr. Jessen is linked to Mercyhealth Hospital-Freeport. Dmand AI links Dr. Jessen to 1 more medical group.
Does Dr. Timothy E. Jessen accept Medicare?
Yes. CMS data shows Dr. Jessen billed Medicare for 1,101 services in 2024, and Dr. Jessen accepts Medicare assignment.
What is Dr. Timothy E. Jessen's MIPS score?
Dr. Jessen's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
How many Medicare patients does Dr. Timothy E. Jessen see?
CMS counts 236 Medicare patients who saw Dr. Jessen in 2024, with an average age of 74.
Show 5 more questionsShow fewer questions
What services does Dr. Timothy E. Jessen bill to Medicare?
In 2024, Dr. Jessen's most billed Medicare services were allergy test or treatment (95004), office visit, established patient (99214) and allergy test or treatment (95018).
Where did Dr. Timothy E. Jessen go to medical school?
Dr. Jessen graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 1983.
What drugs does Dr. Timothy E. Jessen prescribe most?
In 2024 Medicare Part D data, Dr. Jessen's most prescribed drugs by claims were Montelukast Sodium, Prednisone and Albuterol Sulfate Hfa.
Has Dr. Timothy E. Jessen received payments from drug or device companies?
CMS Open Payments shows $4,412 in general payments to Dr. Jessen from 22 companies from 2016 to 2025. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Timothy E. Jessen been practicing?
Dr. Jessen graduated from medical school in 1983, 43 years ago.
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