AstigmatismCataract ExtractionCorneal Pachymetry
Dr. Katie Marie Hallahan, MD
NPI1417249194
- Medicare services, 2019
- 389
- Part D claims, 2020
- 23
- Publications
- 10
- Industry payments
- $181
- Insurance carriers
- 1
- Practice address
- 100 Hospital Rd, Prince Frederick, MD 20678
- Practice phone
- Call (713) 798-5143
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Hallahan's professional email, personal email and mobile number
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Dr. Katie Marie Hallahan is an ophthalmologist in Prince Frederick, Maryland
Dr. Hallahan practices in Prince Frederick, Maryland.
Dr. Hallahan's NPI, 1417249194, was assigned on May 12, 2011. Dr. Hallahan graduated from Cleveland Medical College, Homeopathic in 2011. Dr. Hallahan holds North Carolina license 2018-02831.
NPI and contact details
- NPI
- 1417249194NPI Registry (opens in a new tab)
- NPI enumeration date
- May 12, 2011
- NPI status
- Active
- Practice phone
- (713) 798-5143
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. Katie Marie Hallahan's practice address is in Prince Frederick, Maryland
Dr. Hallahan's practice address in the NPI Registry is 100 Hospital Rd, Prince Frederick, MD 20678, in Calvert County. The practice phone is (713) 798-5143.
- NPI Registry address100 Hospital Rd, Prince Frederick, MD 20678 · Calvert CountyPhone(713) 798-5143
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. Katie Marie Hallahan's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hallahan practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Hallahan's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Katie Marie Hallahan is one of 471 ophthalmologists in Maryland
Ophthalmology is Dr. Hallahan's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Hallahan is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Hallahan's licenses on file in 3 states: North Carolina, Ohio and Texas.
Specialties and state licenses
- Ophthalmology, North CarolinaPrimary
- Ohio license
- Texas license
Ophthalmologists near Dr. Hallahan
Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.
471ophthalmologists in Maryland
5ophthalmologists in Prince Frederick
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Katie Marie Hallahan billed Medicare for 389 services in 2019
CMS data shows 389 Medicare services from Dr. Hallahan across 12 procedure codes in 2019. Medicare paid $23,276 for them. Every service was in an office.
Medicare services, 2019389
Paid by Medicare$23,276
Procedure codes12
Dr. Hallahan's Medicare services by type, 2016 to 2019
- 2016
- 2019
- Tests and treatments
- 2016: 142019: 2341571%
- Office and hospital visits
- 2016: 02019: 132
- Imaging
- 2016: 02019: 23
Dr. Hallahan compared with the Maryland median for ophthalmologists, 2019
- Dr. Hallahan
- Maryland median
- Medicare services
- 389vs 1,38872% below
- Part D claims
- 23vs 38094% below
Medians across 487 ophthalmologists in Maryland with Dmand AI profiles that report each measure.
Dr. Hallahan's most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Hallahan?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hallahan and other ophthalmologists in Maryland.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Katie Marie Hallahan's patients have a median age of 82
Across all payers, Dmand AI patient panel data puts Dr. Hallahan's median patient age at 82, with 100% women.
Dr. Hallahan's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 82
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Katie Marie Hallahan wrote 23 Medicare Part D claims in 2020
In 2020, Dr. Hallahan wrote 23 Medicare Part D claims. They cover 2 drugs, with $16,448 in total drug cost. In 2019, CMS named 60 claims across 3 drugs.
Part D claims, 202023
Drugs named by CMS2
Total drug cost$16,448
Dr. Hallahan's most prescribed drugs by claims, 2020
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, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 602020: 2362%
Drugs named by CMS: 2 in 2020, 3 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Katie Marie Hallahan has 10 publications on record
Dmand AI links 10 papers to Dr. Hallahan, published from 2008 to 2017. The most frequent topics are Cornea, Biomechanical Phenomena and Corneal Pachymetry. Dr. Hallahan has published most often in Ophthalmology. Dr. Hallahan's most frequent co-authors are William J. Dupps, MD, Douglas D. Koch, MD and Zaina Nabil Al-Mohtaseb, MD.
Papers10
Years published2008 to 2017
Dr. Hallahan's papers by year, 2008 to 2017
Topics Dr. Hallahan writes about most
- Cornea
- Biomechanical Phenomena
- Corneal Pachymetry
- Corneal Topography
- Elasticity
- Keratoconus
- Area Under Curve
- Astigmatism
Dr. Hallahan's most frequent co-authors
- William J. Dupps, MD3 shared papers
- Douglas D. Koch, MD2 shared papers
- Zaina Nabil Al-Mohtaseb, MD1 shared paper
Recent publications by Dr. Hallahan
Am J Ophthalmol
Area Under CurveAstigmatismBiomechanical Phenomena
J Cataract Refract Surg
Biomechanical PhenomenaCorneaCorneal Pachymetry
Ophthalmology
CorneaCorneal TopographyDiscriminant Analysis
AtrophyEdemaEyelid Diseases
See who Dr. Hallahan researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Hallahan 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. Katie Marie Hallahan received $181 in industry payments from 2016 to 2025
CMS Open Payments shows 5 general payments to Dr. Hallahan from 4 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $100.
General payments to Dr. Hallahan by program year, 2016 to 2025
Companies that paid Dr. Hallahan the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Katie Marie Hallahan graduated from Cleveland Medical College, Homeopathic
Dr. Hallahan graduated from Cleveland Medical College, Homeopathic in 2011.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. Katie Marie Hallahan accepts plans from 1 insurance carrier
Dr. Hallahan is in network with 1 carrier, including NC State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
- NC State Medicaid
Source: Dmand AI Insurance Network Data
Sources for Dr. Katie Marie Hallahan'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice 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 Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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 |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Katie Marie Hallahan
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. Katie Marie Hallahan's NPI number?
Dr. Katie Marie Hallahan's NPI number is 1417249194. It was assigned on May 12, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Katie Marie Hallahan?
Dr. Katie Marie Hallahan is an ophthalmologist in Prince Frederick, Maryland. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Katie Marie Hallahan practice?
Dr. Hallahan practices at 100 Hospital Rd, Prince Frederick, MD 20678.
What is Dr. Katie Marie Hallahan's office phone number?
The practice phone on file for Dr. Hallahan is (713) 798-5143.
What is Dr. Katie Marie Hallahan's medical license number?
Dr. Hallahan holds North Carolina license 2018-02831, one of the licenses on file in 3 states.
Which states has Dr. Katie Marie Hallahan been licensed in?
Dmand AI has state licenses on file for Dr. Hallahan in North Carolina (2018 to 2026), Ohio (2017 to 2021) and Texas (2015 to 2017).
Does Dr. Katie Marie Hallahan accept Medicare?
Yes. CMS data shows Dr. Hallahan billed Medicare for 389 services in 2019.
Is Dr. Katie Marie Hallahan board certified?
Yes. Dr. Hallahan is board certified in ophthalmology by the American Board of Ophthalmology.
What services does Dr. Katie Marie Hallahan bill to Medicare?
In 2019, Dr. Hallahan's most billed Medicare services were office visit, new patient (99203), eye exam or test (92012) and office visit, established patient (99213).
Where did Dr. Katie Marie Hallahan go to medical school?
Dr. Hallahan graduated from Cleveland Medical College, Homeopathic in 2011.
Show 6 more questionsShow fewer questions
What drugs does Dr. Katie Marie Hallahan prescribe most?
In 2020 Medicare Part D data, Dr. Hallahan's most prescribed drugs by claims were Lumigan and Restasis.
Has Dr. Katie Marie Hallahan received payments from drug or device companies?
CMS Open Payments shows $181 in general payments to Dr. Hallahan from 4 companies from 2016 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Dr. Katie Marie Hallahan been practicing?
Dr. Hallahan graduated from medical school in 2011, 15 years ago.
Does Dr. Katie Marie Hallahan do research?
Dmand AI links 10 publications to Dr. Hallahan, published from 2008 to 2017.
Who does Dr. Katie Marie Hallahan publish with?
Dr. Hallahan's most frequent co-authors are William J. Dupps, MD (3 shared papers), Douglas D. Koch, MD (2 shared papers) and Zaina Nabil Al-Mohtaseb, MD (1 shared paper).
What insurance does Dr. Katie Marie Hallahan accept?
Dr. Hallahan is in network with 1 carrier, including NC State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
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