Charles Frey, DO
Allergy & Immunology Physician · Rockford, IL
Charles Frey, DO is an allergy & immunology physician with a practice address in Rockford, Illinois, and NPI 1356321244, issued on Jan 18, 2006. Check the license (Illinois 036063367, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Charles Frey
- Credential
- DO
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- 036063367 IL
Self-reported in NPPES; status is on the state search - Practice location
- 698 Featherstone RD, Rockford, IL 61107
- Phone
- (815) 398-3277
- Enumerated
- Jan 18, 2006
- Record last updated
- Sep 21, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (815) 484-7001
- Medicaid ID
- 036063367 IL
- Entity
- Type 1 · individual
Also registered at 698 Featherstone RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jonathan Ferguson, MDPlastic Surgery within the Head & Neck (Otolaryngology) Physician1669452934
- Leesa Gillooley, PA-CPhysician Assistant1154567964
- Albert Hudson, MDDermatopathology Physician1053391334
- Michele Jones-Fassett, AUDAudiologist1235119538
Verify Charles Frey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036063367Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
455 Medicare Part D claims for 142 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Montelukast Sodium134 claims
- Fluticasone Propionate74 claims
- Azelastine Hcl67 claims
- Ipratropium Bromide66 claims
- Levocetirizine Dihydrochloride20 claims
- Fluticasone-Salmeterol19 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Allergy & Immunology Physician providers in Illinois
There are 162 allergy & immunology physician records in Illinois.
Other allergy & immunology physician records in Illinois
- Arabelle Abellard, MDPeoria, IL1245729805
- Daryn Abraham, M.D.St Charles, IL1104975770
- Justine Ade, MDUrbana, IL1457707010
- Afia Adu-Gyamfi, MDChicago, IL1245961309
- Ingrid Alexander, MDSpringfield, IL1144269531
- Hetal Amin, MDChannahon, IL1184665424
- Evelyn Angulo, M.D.Glenview, IL1184967770
- Susan Apolinario, M.D.Oak Lawn, IL1174522171
- Noga Askenazi, MDCrystal Lake, IL1972518702
- Sakina Bajowala, M.D.North Aurora, IL1427259605
Common questions
What is Charles Frey, DO's NPI number?
Charles Frey, DO's National Provider Identifier (NPI) is 1356321244, issued on Jan 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Charles Frey, DO located?
The NPPES record lists a practice address at 698 Featherstone RD, Rockford, IL, 61107. Phone: (815) 398-3277. Providers update this record themselves, so call before visiting.
How can I verify Charles Frey, DO's license?
NPPES lists Illinois license number 036063367, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Charles Frey, DO prescribe under Medicare Part D?
In 2024, Charles Frey, DO had 455 Medicare Part D claims for 142 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.