Dr. Grayson Breneman Ashby, MD
- 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
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mayo Clinic Breast Diagnostic Clinic
Mammography / Breast Imaging Center · Rochester, Minnesota
Find Dr. Ashby's professional email, personal email and mobile number
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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
- 1598414641NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5092196642
- NPI enumeration date
- March 23, 2022
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (507) 284-5968
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- 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 Clinic200 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.
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.
| Site | EHR vendor and product |
|---|---|
| Mayo Clinic Breast Diagnostic Clinic | Available with a free account |
| +3 more affiliated sites | Available 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, MinnesotaPrimary
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.
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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ashby and other ophthalmologists in Minnesota.
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.
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
- High blood pressure71%
- High cholesterol67%
- Chronic kidney disease35%
- Diabetes34%
- Arthritis32%
- Ischemic heart disease27%
- Mood disorders26%
- 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.
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.
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.
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
- Brian G. Mohney, MD4 shared papers
- Erick Darald Bothun, MD2 shared papers
- Vanessa E. Torbenson, MD2 shared papers
Recent publications by Dr. Ashby
J Community Health
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.
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.
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.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Grayson Breneman Ashby's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors 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-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand 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).
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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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