TIMOTHY E JESSEN MD
NPI 1831165034
Allergy & Immunology in Freeport, IL

Q: What is Timothy Jessen's NPI number?

The NPI number for Timothy Jessen is 1831165034. It was assigned to this individual provider in the NPPES registry on February 27, 2006.

Q: What is Timothy Jessen's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Q: When was this NPI record last updated?

The NPPES record for Timothy Jessen was last updated on October 23, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since February 27, 2006PECOS EnrolledAccepts Medicare Assignment

86.72/100

CMS Quality Rating

1010 FAIRWAY DR, FREEPORT, IL 61032(815) 599-6930(815) 599-7613 Get Directions Write a Review

NPPES record last updated: October 23, 2017. Verified against the NPPES registry weekly; last sync: November 01, 2026.

On this page

About Timothy E Jessen Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

TIMOTHY E JESSEN MD (NPI 1831165034) is an individual allergy & immunology provider in Freeport, Illinois, licensed in Illinois (036077588) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS, is affiliated with Fhn Memorial Hospital, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (1983).

NPPES Registry Identity

NPI1831165034

Entity TypeIndividualMale

Primary Taxonomy207K00000X

Provider Legal NameTIMOTHY E JESSENCredential: MD

Location Address1010 FAIRWAY DRFreeport, IL 61032-6600

Mailing Address421 W Exchange St, Po Box 268Freeport, IL 61032-4030 · (815) 599-7950

Phone(815) 599-6930

Fax(815) 599-7613

Sole ProprietorNo

Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 1983

Enumeration DateFebruary 27, 2006

Last NPPES UpdateOctober 23, 2017

✔ NPI 1831165034 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians

Taxonomy Code207K00000X

License✔ Licensed in IL · 036077588

Definition

An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.

Also ListedInternal MedicineTaxonomy 207R00000X · License 036077588 (IL)

1010 FAIRWAY DR, Freeport, IL 61032

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Other Identifiers 6

Medicare ID-Type UnspecifiedL66743IL · Group 433440

Medicare UPINB47819IL

Medicaid036077588IL

Medicare PINL66743IL

Medicare PINK45218IL

Medicare ID-Type UnspecifiedL70958IL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include MercyCare, MercyCare Health Plans, Quartz.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Timothy E Jessen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID345286621

PECOS Enrollment IDI20050708000302

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Timothy Jessen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Freeport Memorial Hospital

1.9 mi

General Acute Care Hospital

1045 W STEPHENSON ST
Freeport, IL 61032

Reassigned Medicare billing, Illinois enrollment
478 clinicians in this Medicare group

NPI 1447228788 (815) 599-6000

Freeport Regional Health Care Foundation

1.9 mi

Family Medicine

1036 W STEPHENSON ST
Freeport, IL 61032

Reassigned Medicare billing, Illinois enrollment
391 clinicians in this Medicare group

NPI 1457337016 (815) 599-6000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Test for allergy using allergenic extract 95004

An allergy test with allergenic extract is a diagnostic method to identify substances causing allergic reactions. Small amounts of common allergens are introduced to your body, usually through skin pricks or blood tests. Your body's response helps determine your allergies.

556 services14 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

110 services60 patients

Test for allergy using combination of methods with drug or biological 95018

An allergy test with a drug or biological involves multiple methods. Skin tests may be performed where small amounts of allergens are introduced to the skin. Blood tests measure your immune system's response to specific allergens. These tests help identify what substances you're allergic to.

100 services30 patients

Test to examine how well the lungs exchange gases 94729

This is a test called a pulmonary function test, which helps understand the efficiency of your lungs. It measures how much air your lungs can hold, how quickly you can move air in and out of your lungs, and how well your lungs put oxygen into and remove carbon dioxide from your blood.

58 services58 patients

Test to measure expiratory airflow and volume changes before and after medication administration 94060

This procedure measures how air flows in and out of your lungs. It's done before and after medication to see if the treatment improves your breathing. It's a simple, non-invasive test that involves breathing into a device called a spirometer.

54 services54 patients

Test to determine lung volumes using gas dilution or washout 94727

This test measures lung volumes by either diluting or washing out a known amount of gas in your lungs. You'll breathe in a harmless gas, then exhale. The exhaled air is analyzed to assess your lung capacity and function.

53 services53 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Fhn Memorial Hospital

Acute Care Hospitals · Freeport, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number140160

Location1045 West Stephenson StreetFreeport, IL 61032 · Stephenson County

Emergency services Birthing friendly

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

86.72/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

93.48

Improvement Activities

Cost

64.04

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Albuterol, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose, 1 mg J7613

DME-Drugs Administered Through DME · category DG006N

1 supplier20 claims1,364 services$0.03 avg. paid by Medicare

Pharmacy dispensing fee for inhalation drug(s); per 30 days Q0513

DME-Other DME · category DE000N

2 suppliers19 claims19 services$24.61 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MADISON E PICKARD PT

Physical Therapist