Dr. Johanna Margaret Seddon, MD
- Medicare services, 2024
- 968
- Medicare patients, 2024
- 241
- Part D claims, 2024
- 134
- Publications
- 91
- MIPS score, 2024
- 100
- Practice address
- 55 North Ave, Mendon, MA 01756
- Practice phone
- Call (508) 334-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Umass Memorial Medical Center
Mendon, Massachusetts
Find Dr. Seddon's professional email, personal email and mobile number
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Dr. Johanna Margaret Seddon is an ophthalmologist in Mendon, Massachusetts
Dr. Seddon practices at Umass Memorial Medical Center in Mendon, Massachusetts.
Dr. Seddon's NPI, 1699753681, was assigned on January 9, 2006. Dr. Seddon graduated from University of Pittsburgh School of Medicine in 1974. Dr. Seddon holds Massachusetts license 38282.
- NPI
- 1699753681NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2062309461
- NPI enumeration date
- January 9, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (508) 334-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 78
- Medical school graduation
- 1974
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Johanna Margaret Seddon practices at Umass Memorial Medical Center in Mendon, Massachusetts
Dr. Seddon's primary practice is Umass Memorial Medical Center, at 55 North Ave, Mendon, MA 01756 in Worcester County. The practice phone is (508) 334-1000.
- Umass Memorial Medical Center55 North Ave, Mendon, MA 01756 · Worcester CountyPhone(508) 334-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Johanna Margaret Seddon is affiliated with 2 sites of care and 2 medical groups
Dr. Seddon's primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dr. Seddon is also affiliated with UMass Memorial Medical Center - University Campus. The medical group on file is UMass Memorial Medical Group. Dmand AI also links Dr. Seddon to 1 more medical group, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Johanna Margaret Seddon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Seddon practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Umass Memorial Medical Center | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Johanna Margaret Seddon is one of 617 ophthalmologists in Massachusetts
Ophthalmology is Dr. Seddon's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Seddon is licensed in Massachusetts.
Specialties and state licenses
- Ophthalmology, MassachusettsPrimary
Ophthalmologists near Dr. Seddon
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. Johanna Margaret Seddon billed Medicare for 968 services in 2024
CMS data shows 968 Medicare services from Dr. Seddon across 5 procedure codes in 2024, for 241 Medicare patients. Medicare paid $45,292 for them. Every service was in an office.
Dr. Seddon's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 7622024: 7324%
- Surgery
- 2023: 2222024: 2366%
Dr. Seddon compared with the Massachusetts median for ophthalmologists, 2024
- Dr. Seddon
- Massachusetts median
- Medicare services
- 968vs 1,59839% below
- Medicare patients
- 241vs 59459% below
- Part D claims
- 98vs 54582% below
Medians across 612 ophthalmologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Seddon'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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Johanna Margaret Seddon treated 241 Medicare patients in 2024, average age 76
CMS counts 241 Medicare patients who saw Dr. Seddon in 2024. The largest group is 75 to 84, with 88 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 1.36, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Seddon's median patient age at 77, with 59% women.
Dr. Seddon's Medicare patients by age, 2024
Dr. Seddon's Medicare patients by sex, 2024
- Women14861%
- Men9339%
Chronic conditions among Dr. Seddon's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis41%
- Diabetes38%
- Chronic kidney disease30%
- Ischemic heart disease30%
- Mood disorders29%
- Anxiety27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Seddon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 77
Patient panel by sex, all payers
- Women59%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Johanna Margaret Seddon wrote 134 Medicare Part D claims in 2024
In 2024, Dr. Seddon wrote 134 Medicare Part D claims for 32 patients. 58% of them were for generic drugs. CMS names the drug for 98 of them, across 3 drugs with 11 or more claims each, at $3,072 in total drug cost. In 2023, CMS named 33 claims across 1 drug.
Dr. Seddon's Part D claims by kind of drug, 2024
- Generic78 claims58%
- Brand-name56 claims42%
Dr. Seddon'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: 332024: 98197%
Drugs named by CMS: 3 in 2024, 1 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. Johanna Margaret Seddon scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Dr. Seddon for performance year 2024, reported through an alternative payment model (APM). Dr. Seddon accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Seddon's MIPS scores, performance year 2024
- 100of 100Final score
- 83of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Johanna Margaret Seddon has 91 publications on record
Dmand AI links 91 papers to Dr. Seddon, published from 2008 to 2025. 2016 was the busiest year, with 5. The most frequent topics are Macular Degeneration, Genetic Predisposition to Disease and Polymorphism, Single Nucleotide. Dr. Seddon has published most often in Invest Ophthalmol Vis Sci. Dr. Seddon's most frequent co-authors are John Patterson Atkinson, MD, David H H. Abramson, MD and Michael Paul Triebwasser, MD.
Dr. Seddon's papers by year, 2016 to 2025
Topics Dr. Seddon writes about most
- Macular Degeneration
- Genetic Predisposition to Disease
- Polymorphism, Single Nucleotide
- Disease Progression
- Complement Factor H
- Genotype
- Phenotype
- Genetic Variation
Dr. Seddon's most frequent co-authors
- John Patterson Atkinson, MD11 shared papers
- David H H. Abramson, MD6 shared papers
- Michael Paul Triebwasser, MD6 shared papers
Recent publications by Dr. Seddon
See who Dr. Seddon researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Seddon 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. Johanna Margaret Seddon received $1,414 in industry payments from 2016 to 2025
CMS Open Payments shows 13 general payments to Dr. Seddon from 8 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 71% of the total. Merck Sharp & Dohme Corporation paid the most, $1,000.
General payments to Dr. Seddon by program year, 2016 to 2025
General payments to Dr. Seddon by kind, 2016 to 2025
- Consulting fees$1,00071%
- Food and beverage$40729%
- Gifts$71%
Companies that paid Dr. Seddon 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. Johanna Margaret Seddon graduated from University of Pittsburgh School of Medicine
Dr. Seddon graduated from University of Pittsburgh School of Medicine in 1974.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Johanna Margaret Seddon'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 |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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)Clinician Public Reporting: Overall MIPS Performance (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. Johanna Margaret Seddon
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. Johanna Margaret Seddon's NPI number?
Dr. Johanna Margaret Seddon's NPI number is 1699753681. It was assigned on January 9, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Johanna Margaret Seddon?
Dr. Johanna Margaret Seddon is an ophthalmologist in Mendon, Massachusetts. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. Johanna Margaret Seddon practice?
Dr. Seddon practices at 55 North Ave, Mendon, MA 01756. Dr. Seddon's primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dmand AI also links Dr. Seddon to 1 medical group.
What is Dr. Johanna Margaret Seddon's office phone number?
The practice phone on file for Dr. Seddon is (508) 334-1000.
What is Dr. Johanna Margaret Seddon's medical license number?
Dr. Seddon holds Massachusetts license 38282.
Which hospitals is Dr. Johanna Margaret Seddon affiliated with?
Dr. Seddon is affiliated with UMass Memorial Medical Center - University Campus.
What medical group is Dr. Johanna Margaret Seddon part of?
Dr. Seddon is linked to UMass Memorial Medical Group. Dmand AI links Dr. Seddon to 1 more medical group.
Does Dr. Johanna Margaret Seddon accept Medicare?
Yes. CMS data shows Dr. Seddon billed Medicare for 968 services in 2024, and Dr. Seddon accepts Medicare assignment.
What is Dr. Johanna Margaret Seddon's MIPS score?
Dr. Seddon's MIPS final score for performance year 2024 is 100 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Johanna Margaret Seddon see?
CMS counts 241 Medicare patients who saw Dr. Seddon in 2024, with an average age of 76.
Show 7 more questionsShow fewer questions
What services does Dr. Johanna Margaret Seddon bill to Medicare?
In 2024, Dr. Seddon's most billed Medicare services were eye exam or test (92134), eye exam or test (92014) and surgery: eye (67028).
Where did Dr. Johanna Margaret Seddon go to medical school?
Dr. Seddon graduated from University of Pittsburgh School of Medicine in 1974.
What drugs does Dr. Johanna Margaret Seddon prescribe most?
In 2024 Medicare Part D data, Dr. Seddon's most prescribed drugs by claims were Latanoprost, Dorzolamide-Timolol and Combigan.
Has Dr. Johanna Margaret Seddon received payments from drug or device companies?
CMS Open Payments shows $1,414 in general payments to Dr. Seddon from 8 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Johanna Margaret Seddon been practicing?
Dr. Seddon graduated from medical school in 1974, 52 years ago.
Does Dr. Johanna Margaret Seddon do research?
Dmand AI links 91 publications to Dr. Seddon, published from 2008 to 2025.
Who does Dr. Johanna Margaret Seddon publish with?
Dr. Seddon's most frequent co-authors are John Patterson Atkinson, MD (11 shared papers), David H H. Abramson, MD (6 shared papers) and Michael Paul Triebwasser, MD (6 shared papers).
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