Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Ryan Joseph Longfellow, MD

Individual provider Anesthesiology Physician · NPI 1356768683

Ryan Joseph Longfellow, MD practises Anesthesiology in Madison, Wisconsin. Graduated from Indiana University School of Medicine in 2014, 12 years ago. Practices with University of Wisconsin Medical Foundation Inc, a 2,536-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Alaska, Indiana and Wisconsin.

Years since qualifying
12
Trained at
Indiana University School of Medicine
Licensed in
AK, IN, WI
In the registry since
2014
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

600 Highland Ave
Madison, WI 53792-1902
Phone: (608) 263-8100
Fax: (608) 262-6247
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 10525 W 124th Ave, Cedar Lake, IN 46303-9275 — (219) 805-1484
  • 5165 McCarty Ln, Lafayette, IN 47905-8764 — (765) 448-8000

Specialties & licences

Anesthesiology Physician (primary) Taxonomy 207L00000X · Licence 81042 (WI)
Anesthesiology Physician Taxonomy 207L00000X · Licence 01086496A (IN)
Anesthesiology Physician Taxonomy 207L00000X · Licence 143984 (AK)
Pain Medicine (Anesthesiology) Physician Taxonomy 207LP2900X · Licence 81042 (WI)

Record details

NPI number1356768683
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 25, 2014
Last updated in NPPESMay 27, 2025
Certification dateMay 27, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyANESTHESIOLOGY
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 2014 (12 years in practice)
Group practice University Of Wisconsin Medical Foundation Inc — 2536 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients246
Services billed 257 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at University of Wisconsin Medical Foundation Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2536 clinicians in the practice; 12 are shown here.

Other providers in Madison