Dr. Sergio E. Chiarella, M.D.
Allergy & Immunology (Allergy & Immunology Physician)
- Medicare participating
At a glance
- Years since graduation
- 20
- In the NPI registry since
- 2011
- Medicare patients seen, 2024
- 80
Licensed in Illinois since 2014, according to the Illinois Department of Financial and Professional Regulation. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2011Registered with an NPI (national billing number; not a license date)
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Allergy & Immunology Physician primary
MN license 66215 -
Allergy & Immunology (Internal Medicine) Physician
IL license 036134739 (first issued 2014; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Mayo Clinic Hospital Rochester Rochester, MN
Medical groups
- Mayo Clinic (4,956 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 80
- Services billed
- 590
- Patients’ average age
- 70
| Service | Times | Patients |
|---|---|---|
| New patient office or other outpatient visit, 45-59 minutes | 21 | 21 |
| Established patient office or other outpatient visit, 30-39 minutes | 12 | 11 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Breo Ellipta (fluticasone/vilanterol) Other prescribers in Rochester, MN | 21 |
| Montelukast Sodium Other prescribers in Rochester, MN | 21 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 2 companies reported 2 payments worth $524 in total to this clinician.
| Merck Sharp & Dohme LLC | $375 |
|---|---|
| Biocryst US Sales Co., LLC | $149 |
| Consulting Fee | $375 |
|---|---|
| Food and Beverage | $149 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Merck Sharp & Dohme LLC Aug 25, 2025 | Consulting FeeCompany’s descriptionProvided as part of a research engagement. | $375 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.
Industry-funded research
Named as a principal investigator on 1 industry-funded study in 2025, from 1 company. The companies reported $46,030 in research payments for these studies, mostly to the institutions running them.
- A phase two a,randomized,double blind,placebo controlled study to assess efficacy and safety of atuliflapon given orally once daily for twelve weeks in adults with moderate to severe uncontrolled asthma
AstraZeneca UK Limited
From CMS Open Payments research payments, where companies name up to five principal investigators per payment. Research payments usually go to hospitals, universities and research sites, not to the investigator personally. A payment is not evidence of wrongdoing.