Dr. Charles Frey Jr., DO
- Medicare services, 2023
- 709
- Part D claims, 2024
- 455
- Industry payments
- $444
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 698 Featherstone Rd Suite 250 Suite 250, Rockford, IL 61107-6303
- Practice phone
- Call (815) 398-3277
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Osf Medical Group - Peoria
Multi-specialty group site · Rockford, Illinois
Find Dr. Frey'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. Charles Frey Jr. is an allergist and immunologist in Rockford, Illinois
Dr. Frey practices at Osf Medical Group - Peoria in Rockford, Illinois.
Dr. Frey's NPI, 1356321244, was assigned on January 18, 2006. Dr. Frey holds Illinois license 036063367.
- NPI
- 1356321244NPI Registry (opens in a new tab)
- NPI enumeration date
- January 18, 2006
- NPI status
- Active
- Practice phone
- (815) 398-3277
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 72
- Medical school graduation
- 1980
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Charles Frey Jr. practices at Osf Medical Group - Peoria in Rockford, Illinois
Dr. Frey's primary practice is Osf Medical Group - Peoria, at 698 Featherstone Rd Suite 250 Suite 250, Rockford, IL 61107-6303. The practice phone is (815) 398-3277.
- Osf Medical Group - Peoria698 Featherstone Rd Suite 250 Suite 250, Rockford, IL 61107-6303Phone(815) 398-3277
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Charles Frey Jr. is affiliated with 1 site of care and 1 medical group
Dr. Frey's primary practice is Osf Medical Group - Peoria in Rockford, Illinois. The medical group on file is OSF Multi-Specialty Group.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Charles Frey Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Frey practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Osf Medical Group - Peoria | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Charles Frey Jr. is one of 145 allergists and immunologists in Illinois
Allergy and immunology is Dr. Frey's primary specialty in the NPI Registry, under taxonomy code 207K00000X. Dr. Frey is licensed in Illinois.
Specialties and state licenses
- Allergy and immunology, IllinoisPrimary
Allergists and immunologists near Dr. Frey
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. Charles Frey Jr. billed Medicare for 709 services in 2023
CMS data shows 709 Medicare services from Dr. Frey across 6 procedure codes in 2023. Medicare paid $16,020 for them. Every service was in an office.
Dr. Frey's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Tests and treatments
- 2022: 1,1802023: 49458%
- Office and hospital visits
- 2022: 2882023: 21525%
Dr. Frey compared with the Illinois median for allergists and immunologists, 2023
- Dr. Frey
- Illinois median
- Medicare services
- 709vs 90522% below
- Part D claims
- 391vs 24659% above
Medians across 130 allergists and immunologists in Illinois with Dmand AI profiles that report each measure.
Dr. Frey's most billed Medicare procedure codes, 2023
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. Frey?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Frey 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. Charles Frey Jr.'s patients have a median age of 45
Across all payers, Dmand AI patient panel data puts Dr. Frey's median patient age at 45, with 62% women.
Dr. Frey's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 45
Patient panel by sex, all payers
- Women62%
- Men38%
Source: Dmand AI Patient Panel Data
Dr. Charles Frey Jr. wrote 455 Medicare Part D claims in 2024
In 2024, Dr. Frey wrote 455 Medicare Part D claims for 142 patients. 91% of them were for generic drugs. CMS names the drug for 391 of them, across 7 drugs with 11 or more claims each, at $11,316 in total drug cost. In 2023, CMS named 1,694 claims across 20 drugs.
Dr. Frey's Part D claims by kind of drug, 2024
- Generic415 claims91%
- Brand-name40 claims9%
Dr. Frey'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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,6942024: 39177%
Drugs named by CMS: 7 in 2024, 20 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
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Dr. Charles Frey Jr. received $444 in industry payments from 2016 to 2019
CMS Open Payments shows 6 general payments to Dr. Frey from 4 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 97% of the total. Teva Pharmaceuticals USA, Inc. paid the most, $326.
General payments to Dr. Frey by program year, 2016 to 2019
General payments to Dr. Frey by kind, 2016 to 2019
- Food and beverage$43097%
- Education$143%
Companies that paid Dr. Frey the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Charles Frey Jr.'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Data |
| 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Charles Frey Jr.
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. Charles Frey Jr.'s NPI number?
Dr. Charles Frey Jr.'s NPI number is 1356321244. It was assigned on January 18, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Charles Frey Jr.?
Dr. Charles Frey Jr. is an allergist and immunologist in Rockford, Illinois. The primary specialty in the NPI Registry is Allergy & Immunology Physician (taxonomy code 207K00000X).
Where does Dr. Charles Frey Jr. practice?
Dr. Frey practices at 698 Featherstone Rd Suite 250 Suite 250, Rockford, IL 61107-6303. Dr. Frey's primary practice is Osf Medical Group - Peoria in Rockford, Illinois.
What is Dr. Charles Frey Jr.'s office phone number?
The practice phone on file for Dr. Frey is (815) 398-3277.
What is Dr. Charles Frey Jr.'s medical license number?
Dr. Frey holds Illinois license 036063367.
What medical group is Dr. Charles Frey Jr. part of?
Dr. Frey is linked to OSF Multi-Specialty Group.
Does Dr. Charles Frey Jr. accept Medicare?
Yes. CMS data shows Dr. Frey billed Medicare for 709 services in 2023.
What services does Dr. Charles Frey Jr. bill to Medicare?
In 2023, Dr. Frey's most billed Medicare services were allergy test or treatment (95004), office visit, established patient (99213) and allergy test or treatment (95115).
What drugs does Dr. Charles Frey Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Frey's most prescribed drugs by claims were Montelukast Sodium, Fluticasone Propionate and Azelastine HCl.
Has Dr. Charles Frey Jr. received payments from drug or device companies?
CMS Open Payments shows $444 in general payments to Dr. Frey from 4 companies from 2016 to 2019. The largest total came from Teva Pharmaceuticals USA, Inc.
How long has Dr. Charles Frey Jr. been practicing?
Dr. Frey graduated from medical school in 1980, 46 years ago.
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