Charles Frey, DO
NPI 1356321244 · Allergy & Immunology Physician · Rockford, IL
Charles Frey, DO is a Allergy & Immunology Physician provider in Rockford, IL (NPI 1356321244).
Provider details
- NPI number
- 1356321244
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 036063367 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Montelukast Sodium | 134 | 63 |
| Fluticasone Propionate | 74 | 37 |
| Azelastine Hcl | 67 | 32 |
| Ipratropium Bromide | 66 | 18 |
| Levocetirizine Dihydrochloride | 20 | — |
| Fluticasone Propion/Salmeterolbrand: Fluticasone-Salmeterol | 19 | — |
| Fluticasone Propion/Salmeterolbrand: Wixela Inhub | 11 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-01-18
- Last updated
- 2011-09-21
Frequently asked questions
- What is Charles Frey's NPI number?
- Charles Frey's National Provider Identifier (NPI) is 1356321244, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Charles Frey's specialty?
- Charles Frey is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Charles Frey located?
- Charles Frey's practice location on file with NPPES is 698 Featherstone Rd, Rockford, IL 61107-6303.
- What is Charles Frey's phone number?
- The practice phone number listed in the NPPES registry for Charles Frey is (815) 398-3277.
- Is Charles Frey's NPI active?
- Yes — Charles Frey's NPI (1356321244) is active in the NPPES registry as of the last update on 2011-09-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.