How we list doctors
Our allergist listings come from two federal records, and each one says which. We list every doctor free, in alphabetical order, and we don’t rate or recommend anyone.
Where the listings come from
Medicare records. The Centers for Medicare & Medicaid Services (CMS) publish a file of clinicians enrolled in Medicare, built from enrollment records and the last 12 months of Medicare claims. It is current, but it only covers doctors who work with Medicare. We use the version CMS updated in October 2026.
The national provider registry. Every US health care provider has a National Provider Identifier (NPI), and the registry behind it, NPPES, lists each provider’s specialty and practice address. Doctors keep their own records up to date, so some entries are years old. We use the monthly file from October 2026.
When a doctor appears in both, we show the practice addresses from Medicare records, because they are more recent.
Who we list
- Physicians whose records give allergy and immunology as their specialty, including pediatric allergists and clinical immunologists.
- Ear, nose and throat doctors who list otolaryngic allergy in the registry, in a separate section. They are not allergists.
- Only practice addresses in the 50 states and Washington, DC. A doctor with several practices appears in the list for each area.
We leave out nurse practitioners, physician assistants and others who chose an allergy specialty code in the registry (148 records), NPIs that have been deactivated, and practices listed as organizations. Today the directory lists 7,561 doctors.
What the labels mean
- Medicare records: allergy/immunology
- Medicare lists the doctor under allergy and immunology. The strongest sign the listing is current.
- Medicare records: another specialty
- The doctor is in current Medicare records under another specialty, such as pediatrics, and gives allergy as a specialty in the registry.
- Registry only, updated
- Only the national provider registry lists the doctor, and the record was updated in the last five years. Many pediatric allergists don’t work with Medicare, so they appear here.
- Registry only, not updated
- The registry record hasn’t changed in five years or more and the doctor isn’t in current Medicare records. Many of these doctors have probably moved or retired. We show them in a closed panel at the end of each list.
“Telehealth in Medicare claims” means Medicare’s file marks the doctor as having recently billed Medicare for telehealth visits. It doesn’t mean every visit can be by video.
“Accepts Medicare assignment” means CMS’s file marks the doctor as accepting the Medicare-approved amount as payment in full; “may accept” is CMS’s own term for doctors who may. Both are about Original Medicare, not Medicare Advantage networks. Allergists who accept Medicare assignment
Doctor profiles
Each doctor’s name links to a profile page with every practice address we have for them, which records list them and when those records were updated, their National Provider Identifier, and, from Medicare records, their medical school and graduation year. Profiles show the same public records as the lists, so we ask search engines not to index them.
What a listing doesn’t tell you
A listing isn’t a check of a doctor’s license or board certification. CMS notes that having an NPI “does not ensure or validate” that a provider is licensed or credentialed. Your state medical board can confirm a license, and the American Board of Allergy and Immunology or the American Board of Medical Specialties can confirm board certification. Apart from Medicare assignment, a listing also doesn’t tell you whether a doctor is taking new patients or accepts your insurance: call the practice.
Order, payment and recommendations
Lists are in alphabetical order by last name, grouped by city. Every doctor is listed free. We don’t rate, rank or recommend doctors, and no tool or quiz on AllergyNest points you to a particular doctor or practice. If we ever sell placement, it will be in a separate slot labelled “Sponsored”, at one published price, and it will never change the order of the list.
Corrections
Every listing has a “Report a problem” link. You can also email hello@allergynest.com. We aim to fix errors within five business days, and we take down listings for doctors who have retired, moved away or aren’t allergists.
Doctors can update their own registry record through NPPES, and their Medicare enrollment through CMS. We rebuild the listings from new federal files, and every list shows the month of the files it comes from.
Sources
- Centers for Medicare & Medicaid Services. Doctors and Clinicians national downloadable file.
- Centers for Medicare & Medicaid Services. NPPES downloadable files.
- Centers for Medicare & Medicaid Services. Care Compare: Doctors and Clinicians Initiative (telehealth indicator).
- Medicare.gov. Does your provider accept Medicare as full payment?.
- Centers for Medicare & Medicaid Services. NPPES NPI Registry.