Dr. Grayson Breneman Ashby, MD

  • Rochester, MN
  • Ophthalmologist
NPI1598414641PAC ID5092196642
Medicare services, 2024
245
Medicare patients, 2024
125
Part D claims, 2024
247
Publications
9
Hospital affiliations
1
Practice address
200 First Street SW, Rochester, MN 55905
Practice phone
Call (507) 284-5968
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Mayo Clinic Breast Diagnostic Clinic

Mammography / Breast Imaging Center · Rochester, Minnesota

See all 5 affiliations

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Dr. Grayson Breneman Ashby is an ophthalmologist in Rochester, Minnesota

Dr. Ashby practices at Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota.

Dr. Ashby's NPI, 1598414641, was assigned on March 23, 2022. Dr. Ashby graduated from Mayo Medical School in 2022. Dr. Ashby holds Minnesota license 74599.

NPI and contact details
Medicare PAC ID
5092196642
NPI enumeration date
March 23, 2022
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(507) 284-5968
Professional email
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Personal email
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Mobile number
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Sex
Male
Estimated age
30
Medical school graduation
2022

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Grayson Breneman Ashby practices at Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota

Dr. Ashby's primary practice is Mayo Clinic Breast Diagnostic Clinic, at 200 First Street SW, Rochester, MN 55905. The practice phone is (507) 284-5968.

  • Mayo Clinic Breast Diagnostic Clinic
    200 First Street SW, Rochester, MN 55905Phone(507) 284-5968

Source: Dmand AI Affiliation Data

Dr. Grayson Breneman Ashby is affiliated with 4 sites of care and 1 medical group

Dr. Ashby's primary practice is Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota. Dr. Ashby is also affiliated with Mayo Clinic Hospital, Saint Marys Campus. The medical group on file is Mayo Clinic. Dmand AI also links Dr. Ashby to 1 more clinical lab and 1 hospice, each named with a free account. Dr. Ashby's employer is on file too: a breast imaging center.

See all 5 affiliations for Dr. Ashby

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Grayson Breneman Ashby's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ashby practices, 4 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Mayo Clinic Breast Diagnostic ClinicAvailable with a free account
+3 more affiliated sitesAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Grayson Breneman Ashby is one of 346 ophthalmologists in Minnesota

Ophthalmology is Dr. Ashby's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Ashby is licensed in Minnesota.

Specialties and state licenses

  • Ophthalmology, MinnesotaPrimaryLicense 74599 · taxonomy 207W00000X

Ophthalmologists near Dr. Ashby

Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Grayson Breneman Ashby billed Medicare for 245 services in 2024

CMS data shows 245 Medicare services from Dr. Ashby across 7 procedure codes in 2024, for 125 Medicare patients. Medicare paid $13,683 for them. Every service was in an office.

Medicare services, 2024245
Medicare patients125
Paid by Medicare$13,683
Procedure codes7

Dr. Ashby's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 942024: 18597%
Tests and treatments
2023: 122024: 34183%
Other services
2023: 02024: 26

Dr. Ashby compared with the Minnesota median for ophthalmologists, 2024

  • Dr. Ashby
  • Minnesota median
Medicare services
245vs 81070% below
Medicare patients
125vs 32662% below
Part D claims
175vs 51766% below

Medians across 364 ophthalmologists in Minnesota with Dmand AI profiles that report each measure.

Dr. Ashby's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Ashby

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Grayson Breneman Ashby treated 125 Medicare patients in 2024, average age 74

CMS counts 125 Medicare patients who saw Dr. Ashby in 2024. The largest group is 65 to 74, with 54 patients. 71% of them have high blood pressure, and 67% have high cholesterol. 14% are also on Medicaid. Their average risk score is 1.53, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Ashby's median patient age at 71, with 51% women.

Medicare patients, 2024125
Average age74
Average risk score1.53
Also on Medicaid14%

Dr. Ashby's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Dr. Ashby's Medicare patients by sex, 2024

  • Women6552%
  • Men6048%

Chronic conditions among Dr. Ashby's Medicare patients, 2024

  1. High blood pressure71%
  2. High cholesterol67%
  3. Chronic kidney disease35%
  4. Diabetes34%
  5. Arthritis32%
  6. Ischemic heart disease27%
  7. Mood disorders26%
  8. Depression23%

Share of Medicare patients with each condition. A patient can have several.

Dr. Ashby's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 71

Patient panel by sex, all payers

  • Women51%
  • Men49%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Grayson Breneman Ashby wrote 247 Medicare Part D claims in 2024

In 2024, Dr. Ashby wrote 247 Medicare Part D claims for 101 patients. 64% of them were for generic drugs. CMS names the drug for 175 of them, across 9 drugs with 11 or more claims each, at $10,818 in total drug cost. In 2023, CMS named 29 claims across 2 drugs.

Part D claims, 2024247
Drugs named by CMS9
Total drug cost$10,818
Part D patients101

Dr. Ashby's Part D claims by kind of drug, 2024

  • Generic157 claims64%
  • Brand-name90 claims36%

Dr. Ashby's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 292024: 175503%

Drugs named by CMS: 9 in 2024, 2 in 2023.

See all prescribing by Dr. Ashby

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. Grayson Breneman Ashby ranks in the 54th percentile for cataract surgery in Medicare

Dr. Ashby accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 32 procedures of cataract surgery by Dr. Ashby, more than 54% of the clinicians it reports for that procedure.

Accepts Medicare assignment
Yes

Where Dr. Ashby ranks in Medicare procedure volume

Cataract surgery
54th percentile32 procedures

CMS ranks each clinician against every clinician it reports for the same procedure category.

Removal or shaving of skin growth: 1 to 10 procedures (CMS shows small counts as a range)

Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)

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Dr. Grayson Breneman Ashby has 9 publications on record

Dmand AI links 9 papers to Dr. Ashby, published from 2019 to 2024. 2022 was the busiest year, with 3. The most frequent topics are COVID-19, Pandemics and Postpartum Period. Dr. Ashby has published most often in J AAPOS. Dr. Ashby's most frequent co-authors are Brian G. Mohney, MD, Erick Darald Bothun, MD and Vanessa E. Torbenson, MD.

Papers9
Years published2019 to 2024

Dr. Ashby's papers by year, 2019 to 2024

Topics Dr. Ashby writes about most

  • COVID-19
  • Pandemics
  • Postpartum Period
  • Dacryocystorhinostomy
  • Lacrimal Duct Obstruction
  • Nasolacrimal Duct

Dr. Ashby's most frequent co-authors

Recent publications by Dr. Ashby

See all 9 publications and co-authors

See who Dr. Ashby researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ashby works with, so you can find a warm path to the right ophthalmologists.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Grayson Breneman Ashby received $218 in industry payments in 2024

CMS Open Payments shows 2 general payments to Dr. Ashby from 2 drug and device companies in 2024. Food and beverage make up the largest share, 100% of the total. Sight Sciences, Inc. paid the most, $148.

Companies that paid Dr. Ashby the most, 2024 to 2024

Share is of all general payments to this clinician.

See all payments to Dr. Ashby

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Grayson Breneman Ashby graduated from Mayo Medical School

Dr. Ashby graduated from Mayo Medical School in 2022.

  1. Medical schoolMayo Medical School

Source: Dmand AI Professional Profile Data

Sources for Dr. Grayson Breneman Ashby's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Grayson Breneman Ashby

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. Grayson Breneman Ashby's NPI number?

Dr. Grayson Breneman Ashby's NPI number is 1598414641. It was assigned on March 23, 2022, and it is active in the NPI Registry.

What kind of doctor is Dr. Grayson Breneman Ashby?

Dr. Grayson Breneman Ashby is an ophthalmologist in Rochester, Minnesota. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).

Where does Dr. Grayson Breneman Ashby practice?

Dr. Ashby practices at 200 First Street SW, Rochester, MN 55905. Dr. Ashby's primary practice is Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota. Dmand AI also links Dr. Ashby to 1 clinical lab and 1 hospice.

What is Dr. Grayson Breneman Ashby's office phone number?

The practice phone on file for Dr. Ashby is (507) 284-5968.

What is Dr. Grayson Breneman Ashby's medical license number?

Dr. Ashby holds Minnesota license 74599.

Which hospitals is Dr. Grayson Breneman Ashby affiliated with?

Dr. Ashby is affiliated with Mayo Clinic Hospital, Saint Marys Campus.

What medical group is Dr. Grayson Breneman Ashby part of?

Dr. Ashby is linked to Mayo Clinic.

Does Dr. Grayson Breneman Ashby accept Medicare?

Yes. CMS data shows Dr. Ashby billed Medicare for 245 services in 2024, and Dr. Ashby accepts Medicare assignment.

How many Medicare patients does Dr. Grayson Breneman Ashby see?

CMS counts 125 Medicare patients who saw Dr. Ashby in 2024, with an average age of 74.

What services does Dr. Grayson Breneman Ashby bill to Medicare?

In 2024, Dr. Ashby's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and eye exam or test (92134).

Show 6 more questionsShow fewer questions

Where did Dr. Grayson Breneman Ashby go to medical school?

Dr. Ashby graduated from Mayo Medical School in 2022.

What drugs does Dr. Grayson Breneman Ashby prescribe most?

In 2024 Medicare Part D data, Dr. Ashby's most prescribed drugs by claims were Prednisolone Acetate, Latanoprost and Valacyclovir.

Has Dr. Grayson Breneman Ashby received payments from drug or device companies?

CMS Open Payments shows $218 in general payments to Dr. Ashby from 2 companies from 2024 to 2024. The largest total came from Sight Sciences, Inc.

How long has Dr. Grayson Breneman Ashby been practicing?

Dr. Ashby graduated from medical school in 2022, 4 years ago.

Does Dr. Grayson Breneman Ashby do research?

Dmand AI links 9 publications to Dr. Ashby, published from 2019 to 2024.

Who does Dr. Grayson Breneman Ashby publish with?

Dr. Ashby's most frequent co-authors are Brian G. Mohney, MD (4 shared papers), Erick Darald Bothun, MD (2 shared papers) and Vanessa E. Torbenson, MD (2 shared papers).

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