Katherine Duncan, M.D.
Ophthalmology Physician · Towson, MD
Katherine Duncan, M.D. is an ophthalmology physician with a practice address in Towson, Maryland, and NPI 1407113566, issued on Apr 13, 2012. Check the license (Maryland D83693, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Katherine Duncan
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- D83693 MD
MD456923 PA
Self-reported in NPPES; status is on the state search - Practice location
- 8625 Pleasant Plains RD, Towson, MD 21286
- Phone
- (410) 828-5558
- Enumerated
- Apr 13, 2012
- Record last updated
- Jul 21, 2022
- Medicare enrollment
- Enrolled (PECOS I20170821001723); accepts Medicare assignment
- Medical or professional school
- University Of Maryland School Of Medicine, 2012
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 588 in Maryland → Look up another NPI →
Also registered at 8625 Pleasant Plains RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- George Duncan, M.D.Ophthalmology Physician1629061148
- Mark Foley, O.D.Optometrist1407849995
- Elizabeth McGinn, O.D.Optometrist1578556064
- Martin McGinn, O.D.Optometrist1184617672
Verify Katherine Duncan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D83693Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% fewer Medicare Part D claims than the average ophthalmology physician in 2024
841 Medicare Part D claims for 279 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 31% of claims.
Most prescribed
- Latanoprost295 claims
- Erythromycin75 claims
- Dorzolamide-Timolol67 claims
- Neomycin-Polymyxin-Dexameth56 claims
- Timolol Maleate52 claims
- Tobramycin-Dexamethasone38 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $379.93
17 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Greater Baltimore Medical Center IncBaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Duncan among 588 ophthalmology physician records in Maryland
Katherine Duncan, M.D. is one of 588 ophthalmology physician records with a practice address in Maryland. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2012, is newer than 78% of them.
- NPI issued2012 · 78% of these records are older, 20% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2012 · median 2002 among the 369 with a school on file
- Record last updated2022 · 65% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Maryland
There are 588 ophthalmology physician records in Maryland.
All 588 in Maryland → Every provider in Towson → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- George Duncan, M.D.Towson, MD 212861629061148
- Richard Scholz, M.D.Towson, MD 212861780632331
- Esen Akpek, M.D.Baltimore, MD 212871851356943
- John Baer, M.D.Baltimore, MD 212871013984848
- Heather Bartlett Casparis, M.D.Baltimore, MD 212871629033147
- Neil Bressler, M.D.Baltimore, MD 212871790742245
- Peter Campochiaro, M.D.Baltimore, MD 212871598723850
- Marianne Cowley, MDBaltimore, MD 212871811964448
Common questions
What is Katherine Duncan, M.D.'s NPI number?
Katherine Duncan, M.D.'s National Provider Identifier (NPI) is 1407113566, issued on Apr 13, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Duncan, M.D. located?
The NPPES record lists a practice address at 8625 Pleasant Plains RD, Towson, MD, 21286. Phone: (410) 828-5558. Providers update this record themselves, so call before visiting.
How can I verify Katherine Duncan, M.D.'s license?
NPPES lists Maryland license number D83693, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine Duncan, M.D. prescribe under Medicare Part D?
In 2024, Katherine Duncan, M.D. had 841 Medicare Part D claims for 279 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.