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

Individual provider Corneal and Contact Management Optometrist · NPI 1649655549

Abigail Christine Gillogly Harsch, OD is registered under Optometry in Tahlequah, Oklahoma. Graduated from University of Houston - College of Optometry in 2015, 11 years ago. Practices with Nittany Eye Associates Ltd, an 11-clinician group and accepts Medicare assignment. Licensed in Oklahoma.

Years since qualifying
11
Trained at
University of Houston - College of Optometry
Licensed in
OK
In the registry since
2015
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

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Practice location Address checks out

1001 N Grand Ave Northeastern State University Oklahoma College Of Optom
Tahlequah, OK 74464-7017 Not confirmed with CMS for 11 years — call before visiting
Phone: (918) 444-4031
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Corneal and Contact Management Optometrist (primary) Taxonomy 152WC0802X · Licence 2850 (OK)

Record details

NPI number1649655549
Entity typeIndividual (Type 1)
GenderFemale
Credentials OD
Sole proprietorNo
NPI enumeratedJuly 21, 2015
Last updated in NPPESJuly 21, 2015

Medicare enrollment

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

Medicare specialtyOPTOMETRY
Medical schoolUNIVERSITY OF HOUSTON - COLLEGE OF OPTOMETRY
Graduated 2015 (11 years in practice)
Group practice Nittany Eye Associates Ltd — 11 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Cataract surgery 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients235
Services billed 580 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Compensation for serving as faculty or as a speaker for a medical education program $6,825 3 payments
Food and Beverage $685 26 payments · a meal or drink at a meeting or visit, not a fee
Travel and Lodging $562 14 payments · travel or lodging paid or reimbursed, such as to attend a conference

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at Nittany Eye Associates Ltd

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Tahlequah