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Pollen data from Google: a modeled pollen index from 0 to 5, not a pollen count. Food recalls from company announcements FDA posts and FDA’s enforcement reports via openFDA. Allergist listings from CMS’s Medicare records and the national provider registry (NPPES); allergist counts from CMS and the Census Bureau. Allergen pages cite their sources, mostly ACAAI, the FDA, AAAAI, AAFA, the USDA and the CDC. AllergyNest includes Google Maps content, whose use is subject to the Google Maps End User Additional Terms of Service and the Google Privacy Policy. AllergyNest is general information, not medical advice. In an emergency, call 911.

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Ashleigh A. Olson, MD: Allergist in Sun Prairie, WI | AllergyNest

Find an allergist/Wisconsin/Madison area

Ashleigh A. Olson, MD

Listed as an allergist, with 9 practice addresses in Sun Prairie, Wisconsin, and 4 other cities.

Practice locations 9

Dean Health Systems Inc
10 Tower Dr
Sun Prairie, WI 53590
(608) 825-3500
Dean Health Systems Inc
1211 Fish Hatchery Rd
Madison, WI 53715
(608) 252-8000
Dean Health Systems Inc
1821 S Stoughton Rd
Madison, WI 53716
(608) 260-6000
Dean Health Systems Inc
2840 Okeeffe Ave
Sun Prairie, WI 53590
(608) 229-8484
Dean Health Systems Inc
2850 Okeeffe Ave
Sun Prairie, WI 53590
(608) 282-2000
Dean Health Systems Inc
3200 E Racine St
Janesville, WI 53546
(608) 371-8000
Dean Health Systems Inc
515 22nd Ave
Monroe, WI 53566
(608) 324-2000
Dean Health Systems Inc
740 Reena Ave
Fort Atkinson, WI 53538
(920) 563-0888
Dean Health Systems Inc
752 N High Point Rd
Madison, WI 53717
(608) 824-4000

From the records

Specialty: Allergist
Records: Medicare records: allergy/immunology (October 2026).
Medicare: Accepts the Medicare-approved amount as payment in full (Medicare assignment), according to CMS’s file. This applies to Original Medicare; Medicare Advantage plans have their own networks. What assignment means
Telehealth: Medicare’s file shows recent telehealth visits. It doesn’t mean every visit can be by video.

Medical school

University of Wisconsin School of Medicine, graduated 2011 (Medicare records)

Registry record

Last updated October 2020

NPI

1699064238 (national provider registry)

A listing isn’t a check of a license or board certification, and it doesn’t tell you whether a doctor is taking new patients or accepts your insurance. Call the practice. How we list doctors Checking your insurance

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More allergists

In the Madison area
In the Janesville area
In Wisconsin

Pollen in Madison today

From CMS’s Doctors and Clinicians file (October 2026) and the national provider registry, NPPES (October 2026). Listings are free and in alphabetical order; we don’t rate or recommend doctors. How we list doctors