Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark Terrence Fay, MD

Individual provider Ophthalmology Physician · NPI 1972563781

Dr. Mark Terrence Fay, MD is an Ophthalmology in Klamath Falls, Oregon. Graduated from University of Washington School of Medicine in 1976, 50 years ago. Practices with Klamath Ophthalmology PC, a 6-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Oregon.

Years since qualifying
50
Trained at
University of Washington School of Medicine
Licensed in
CA, OR
In the registry since
2006
Specialties on file
2
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

2640 Biehn St
Klamath Falls, OR 97601-1181
Phone: (541) 884-3148
Fax: (541) 884-3373
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1201 Thomason Ln, Alturas, CA 96101-3150 — (530) 233-2020

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence MD16253 (OR)
Ophthalmology Physician Taxonomy 207W00000X · Licence G58765 (CA)

Record details

NPI number1972563781
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 24, 2006
Last updated in NPPESFebruary 11, 2021
Certification dateFebruary 11, 2021
Mailing address2640 Biehn St, Klamath Falls, OR 97601-1181

Medicare enrollment

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

Medicare specialtyOPHTHALMOLOGY
Medical schoolUNIVERSITY OF WASHINGTON SCHOOL OF MEDICINE
Graduated 1976 (50 years in practice)
Group practice Klamath Ophthalmology Pc — 6 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Klamath Falls