Dr. John Karl Frederiksen, MD, PhD
- Medicare services, 2024
- 593
- Medicare patients, 2024
- 150
- MIPS score, 2024
- 93
- Hospital affiliations
- 1
- Medical group
- 1
- Practice address
- 1740 West Taylor St Suite 1400, Chicago, IL 60612
- Practice phone
- Call (312) 996-3900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. John Karl Frederiksen is a pathologist in Chicago, Illinois
Dr. Frederiksen practices at University of Illinois Hospital in Chicago, Illinois, part of University of Illinois System.
Dr. Frederiksen's NPI, 1396987277, was assigned on March 24, 2009. Dr. Frederiksen graduated from University of Chicago, Pritzker School of Medicine in 2009. Dr. Frederiksen holds Illinois license 036.158028.
- NPI
- 1396987277NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3577789114
- NPI enumeration date
- March 24, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 996-3900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 43
- Medical school graduation
- 2009
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. John Karl Frederiksen practices at University of Illinois Hospital in Chicago, Illinois
Dr. Frederiksen's primary practice is University of Illinois Hospital, at 1740 West Taylor St Suite 1400, Chicago, IL 60612 in Cook County. The practice phone is (312) 996-3900.
- University of Illinois Hospital1740 West Taylor St Suite 1400, Chicago, IL 60612 · Cook CountyPhone(312) 996-3900
Source: Dmand AI Affiliation Data
Dr. John Karl Frederiksen is affiliated with 2 sites of care and 1 medical group
Dr. Frederiksen's primary practice is University of Illinois Hospital in Chicago, Illinois, part of University of Illinois System. The medical group on file is University of Illinois Physicians Group (UIPG). Dmand AI also links Dr. Frederiksen to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Karl Frederiksen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Frederiksen practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University of Illinois Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Karl Frederiksen is one of 487 pathologists in Illinois
Anatomic pathology and clinical pathology is Dr. Frederiksen's primary specialty in the NPI Registry, under taxonomy code 207ZP0102X. Dr. Frederiksen is licensed in Illinois.
Specialties and state licenses
- Anatomic pathology and clinical pathology, IllinoisPrimary
Pathologists near Dr. Frederiksen
Counts of pathologists 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. John Karl Frederiksen billed Medicare for 593 services in 2024
CMS data shows 593 Medicare services from Dr. Frederiksen across 12 procedure codes in 2024, for 150 Medicare patients. Medicare paid $12,936 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Frederiksen's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 3432024: 57768%
- Other services
- 2023: 02024: 16
Dr. Frederiksen compared with the Illinois median for pathologists, 2024
- Dr. Frederiksen
- Illinois median
- Medicare services
- 593vs 1,38957% below
- Medicare patients
- 150vs 57374% below
Medians across 481 pathologists in Illinois with Dmand AI profiles that report each measure.
Dr. Frederiksen'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Karl Frederiksen treated 150 Medicare patients in 2024, average age 59
CMS counts 150 Medicare patients who saw Dr. Frederiksen in 2024. The largest group is under 65, with 73 patients. 75% of them have high blood pressure, and 49% have high cholesterol. 71% are also on Medicaid. Their average risk score is 3.65, 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. Frederiksen's median patient age at 42, with 50% women.
Dr. Frederiksen's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Frederiksen's Medicare patients by sex, 2024
- Women9261%
- Men5839%
Chronic conditions among Dr. Frederiksen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol49%
- Arthritis45%
- Chronic kidney disease41%
- Diabetes38%
- Heart failure33%
- Mood disorders31%
- Ischemic heart disease27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Frederiksen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 42
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. John Karl Frederiksen 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. Frederiksen for performance year 2024, reported as part of a group. Dr. Frederiksen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Frederiksen's MIPS scores, performance year 2024
- 93of 100Final score
- 73.5of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 71of 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. John Karl Frederiksen graduated from University of Chicago, Pritzker School of Medicine
Dr. Frederiksen graduated from University of Chicago, Pritzker School of Medicine in 2009.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. John Karl Frederiksen'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) |
| 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) |
| 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. John Karl Frederiksen
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What is Dr. John Karl Frederiksen's NPI number?
Dr. John Karl Frederiksen's NPI number is 1396987277. It was assigned on March 24, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. John Karl Frederiksen?
Dr. John Karl Frederiksen is a pathologist in Chicago, Illinois. The primary specialty in the NPI Registry is Anatomic Pathology & Clinical Pathology Physician (taxonomy code 207ZP0102X).
Where does Dr. John Karl Frederiksen practice?
Dr. Frederiksen practices at 1740 West Taylor St Suite 1400, Chicago, IL 60612. Dr. Frederiksen's primary practice is University of Illinois Hospital in Chicago, Illinois, part of University of Illinois System. Dmand AI also links Dr. Frederiksen to 1 group practice or clinic.
What is Dr. John Karl Frederiksen's office phone number?
The practice phone on file for Dr. Frederiksen is (312) 996-3900.
What is Dr. John Karl Frederiksen's medical license number?
Dr. Frederiksen holds Illinois license 036.158028.
Which hospitals is Dr. John Karl Frederiksen affiliated with?
Dr. Frederiksen practices at University of Illinois Hospital in Chicago, Illinois.
What medical group is Dr. John Karl Frederiksen part of?
Dr. Frederiksen is linked to University of Illinois Physicians Group (UIPG).
Does Dr. John Karl Frederiksen accept Medicare?
Yes. CMS data shows Dr. Frederiksen billed Medicare for 593 services in 2024, and Dr. Frederiksen accepts Medicare assignment.
What is Dr. John Karl Frederiksen's MIPS score?
Dr. Frederiksen'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. John Karl Frederiksen see?
CMS counts 150 Medicare patients who saw Dr. Frederiksen in 2024, with an average age of 59.
Show 3 more questionsShow fewer questions
What services does Dr. John Karl Frederiksen bill to Medicare?
In 2024, Dr. Frederiksen's most billed Medicare services were lab and pathology test (83020), lab and pathology test (88341) and lab and pathology test (88305).
Where did Dr. John Karl Frederiksen go to medical school?
Dr. Frederiksen graduated from University of Chicago, Pritzker School of Medicine in 2009.
How long has Dr. John Karl Frederiksen been practicing?
Dr. Frederiksen graduated from medical school in 2009, 17 years ago.
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