1. Home
  2. Directory
  3. Wisconsin
  4. La Crosse
  5. Ophthalmology
  6. NPI Profile

DENNIS K RYAN MD
NPI 1821092628
Ophthalmology in La Crosse, WI

Active since June 09, 2005
1836 SOUTH AVE, LA CROSSE, WI 54601(608) 782-7300 Get Directions Write a Review

NPPES record last updated: June 14, 2026. Verified against the NPPES registry weekly; last sync: July 26, 2026.

About Dennis K Ryan Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DENNIS K RYAN MD (NPI 1821092628) is an individual ophthalmology provider in La Crosse, Wisconsin, licensed in Wisconsin (19157) and active in the NPI registry since June 2005.

NPPES Registry Identity

NPI1821092628
Entity TypeIndividualMale
Primary Taxonomy207W00000X
Provider Legal NameDENNIS K RYANCredential: MD
Location Address1836 SOUTH AVELa Crosse, WI 54601-5429
Mailing Address1836 South AveLa Crosse, WI 54601-5429 · (608) 782-7300
Phone(608) 782-7300
Sole ProprietorNo
Enumeration DateJune 9, 2005
Last NPPES UpdateJune 14, 2026
✔ NPI 1821092628 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
License✔ Licensed in WI · 19157
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
1836 SOUTH AVE, La Crosse, WI 54601
Open in Google Maps ↗

Other Identifiers 1

Medicaid31105200WI

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JEFFREY BRIAN TROHKIMOINEN M.D.
Anesthesiology
1836 SOUTH AVE, GUNDERSEN CLINIC, LTD.
LA CROSSE, WI 54601
La Crosse County (608) 775-2031
JESSICA E THESING CRNA
Nurse Anesthetist, Certified Registered
1836 SOUTH AVE
LA CROSSE, WI 54601
La Crosse County (608) 782-7300
DR. MICHAEL DAVID SMITH PSY.D.
Psychologist
1836 SOUTH AVE
LA CROSSE, WI 54601
La Crosse County (608) 782-7300
JESSICA MAE RASMUSSEN
Surgery
1836 SOUTH AVE
LA CROSSE, WI 54601
La Crosse County (608) 782-7300
JULIE SONSALLA APNP
Nurse Practitioner (Adult Health)
1836 SOUTH AVE
LA CROSSE, WI 54601
La Crosse County (608) 782-7300
LAURA KLINGBEIL
Orthopaedic Surgery
1836 SOUTH AVE
LA CROSSE, WI 54601
La Crosse County (608) 782-7300
SUSAN CAROL SORRENTINO RN
Registered Nurse (Addiction (Substance Use Disorder))
1836 SOUTH AVE
LA CROSSE, WI 54601
La Crosse County (608) 782-7300
NAOMI MUTHONI RUIRU APNP
Nurse Practitioner (Family)
1836 SOUTH AVE
LA CROSSE, WI 54601
La Crosse County (608) 782-7300

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Dennis Ryan's NPI number?

The NPI number for Dennis Ryan is 1821092628. It was assigned to this individual provider in the NPPES registry on June 9, 2005.

Where is Dennis Ryan located?

Dennis Ryan practices at 1836 South Ave, La Crosse, WI 54601. The listed phone number is (608) 782-7300.

What is Dennis Ryan's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

When was this NPI record last updated?

The NPPES record for Dennis Ryan was last updated on June 14, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.