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

Grayson Breneman Ashby, MD

Individual provider Ophthalmology Physician · NPI 1598414641

Grayson Breneman Ashby, MD practises Ophthalmology in Nashville, Tennessee. Graduated from Mayo Medical School in 2022, 4 years ago. Practices with Mayo Clinic, a 4,796-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Minnesota and Tennessee.

Years since qualifying
4
Trained at
Mayo Medical School
Licensed in
MN, TN
In the registry since
2022
Specialties on file
3
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

1301 Medical Center Dr
Nashville, TN 37232-0028
Phone: (615) 322-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 200 1st St Sw, Rochester, MN 55905-0001 — (507) 284-2511

Specialties & licences

Pediatric Ophthalmology and Strabismus Specialist Physician (primary) Taxonomy 207WX0110X · Licence 77046 (TN)
Ophthalmology Physician Taxonomy 207W00000X · Licence 32438 (MN)
Ophthalmology Physician Taxonomy 207W00000X · Licence 74599 (MN)

Record details

NPI number1598414641
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 23, 2022
Last updated in NPPESJuly 7, 2026
Certification dateJuly 7, 2026

Medicare enrollment

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

Medicare specialtyOPHTHALMOLOGY
Medical schoolMAYO MEDICAL SCHOOL
Graduated 2022 (4 years in practice)
Group practice Mayo Clinic — 4796 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 18 times · 42nd percentile
Removal or shaving of skin growth 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 patients125
Services billed 324 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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 Mayo Clinic

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 4796 clinicians in the practice; 12 are shown here.

Other providers in Nashville