Clin Cardiol
Aortic Valve StenosisEchocardiographyExercise Tolerance
Dr. Mary Ann Williamson, MD
NPI1598931206PAC ID3173679644
- Medicare services, 2024
- 3,376
- Medicare patients, 2024
- 1,451
- Part D claims, 2024
- 5,865
- Publications
- 1
- Hospital affiliations
- 2
- Practice address
- 595 W State St, Doylestown, PA 18901
- Practice phone
- Call (215) 345-2321
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Penn Medicine Doylestown Health
Doylestown, Pennsylvania
Find Dr. Williamson's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mary Ann Williamson is a cardiologist in Doylestown, Pennsylvania
Dr. Williamson practices at Penn Medicine Doylestown Health in Doylestown, Pennsylvania.
Dr. Williamson's NPI, 1598931206, was assigned on May 2, 2008. Dr. Williamson holds Pennsylvania license MD448085.
NPI and contact details
- NPI
- 1598931206NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3173679644
- NPI enumeration date
- May 2, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (215) 345-2321
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mary Ann Williamson practices at Penn Medicine Doylestown Health in Doylestown, Pennsylvania
Dr. Williamson's primary practice is Penn Medicine Doylestown Health, at 595 W State St, Doylestown, PA 18901 in Bucks County. The practice phone is (215) 345-2321.
- Penn Medicine Doylestown Health595 W State St, Doylestown, PA 18901 · Bucks CountyPhone(215) 345-2321
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mary Ann Williamson is affiliated with 6 sites of care and 3 medical groups
Dr. Williamson's primary practice is Penn Medicine Doylestown Health in Doylestown, Pennsylvania. Dr. Williamson is also affiliated with Doylestown Hospital. The medical group on file is Doylestown Health Vascular Surgery. Dmand AI also links Dr. Williamson to 1 more hospital, 3 group practices and clinics and 2 medical groups, each named with a free account.
Penn Medicine Doylestown HealthPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Mary Ann Williamson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williamson practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Penn Medicine Doylestown Health | Available with a free account |
| +5 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mary Ann Williamson is one of 1,206 cardiologists in Pennsylvania
Cardiovascular disease is Dr. Williamson's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Williamson is licensed in Pennsylvania.
Specialties and state licenses
- Cardiovascular disease, PennsylvaniaPrimary
Cardiologists near Dr. Williamson
Counts of cardiologists 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. Mary Ann Williamson billed Medicare for 3,376 services in 2024
CMS data shows 3,376 Medicare services from Dr. Williamson across 26 procedure codes in 2024, for 1,451 Medicare patients. Medicare paid $164,057 for them.
Medicare services, 20243,376
Medicare patients1,451
Paid by Medicare$164,057
Procedure codes26
Dr. Williamson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 1,5842024: 1,88419%
- Office and hospital visits
- 2023: 1,0912024: 1,1092%
- Other services
- 2023: 212024: 3181414%
- Imaging
- 2023: 682024: 654%
Where Dr. Williamson's Medicare services took place, 2024
- In an office2,11663%
- In a facility1,26037%
Dr. Williamson compared with the Pennsylvania median for cardiologists, 2024
- Dr. Williamson
- Pennsylvania median
- Medicare services
- 3,376vs 1,74593% above
- Medicare patients
- 1,451vs 85570% above
- Part D claims
- 5,624vs 1,6693.4 times
Medians across 1,207 cardiologists in Pennsylvania with Dmand AI profiles that report each measure.
Dr. Williamson'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.
Need commercial claims for Dr. Williamson?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williamson and other cardiologists in Pennsylvania.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mary Ann Williamson treated 1,451 Medicare patients in 2024, average age 76
CMS counts 1,451 Medicare patients who saw Dr. Williamson in 2024. The largest group is 75 to 84, with 599 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 6% are also on Medicaid. Their average risk score is 1.39, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williamson's median patient age at 77, with 54% women.
Medicare patients, 20241,451
Average age76
Average risk score1.39
Also on Medicaid6%
Dr. Williamson's Medicare patients by age, 2024
Dr. Williamson's Medicare patients by sex, 2024
- Women81156%
- Men64044%
Chronic conditions among Dr. Williamson's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis49%
- Ischemic heart disease44%
- Atrial fibrillation39%
- Anxiety30%
- Heart failure30%
- Diabetes29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Williamson'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
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mary Ann Williamson wrote 5,865 Medicare Part D claims in 2024
In 2024, Dr. Williamson wrote 5,865 Medicare Part D claims for 750 patients. 82% of them were for generic drugs. CMS names the drug for 5,624 of them, across 49 drugs with 11 or more claims each, at $1,252,961 in total drug cost. In 2023, CMS named 5,068 claims across 50 drugs.
Part D claims, 20245,865
Drugs named by CMS49
Total drug cost$1.3M
Part D patients750
Dr. Williamson's Part D claims by kind of drug, 2024
- Generic4,815 claims82%
- Brand-name1,050 claims18%
Dr. Williamson'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.
Drug classes CMS tracks in Dr. Williamson's Part D claims, 2024
- Antibiotics0%16 of 5,865 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 5,0682024: 5,62411%
Drugs named by CMS: 49 in 2024, 50 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
How Dr. Mary Ann Williamson takes part in Medicare
Dr. Williamson accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mary Ann Williamson has 1 publication on record
Dmand AI links 1 paper to Dr. Williamson in 2012. Dr. Williamson's most frequent co-author is Eli V. Gelfand, MD.
Papers1
Dr. Williamson's most frequent co-authors
Recent publications by Dr. Williamson
See who Dr. Williamson researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Williamson works with, so you can find a warm path to the right cardiologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mary Ann Williamson received $3,197 in industry payments from 2016 to 2025
CMS Open Payments shows 190 general payments to Dr. Williamson from 25 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Novartis Pharmaceuticals Corporation paid the most, $793.
General payments to Dr. Williamson by program year, 2016 to 2025
Companies that paid Dr. Williamson the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mary Ann Williamson'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 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) |
| 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) |
| 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. Mary Ann Williamson
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. Mary Ann Williamson's NPI number?
Dr. Mary Ann Williamson's NPI number is 1598931206. It was assigned on May 2, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Mary Ann Williamson?
Dr. Mary Ann Williamson is a cardiologist in Doylestown, Pennsylvania. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).
Where does Dr. Mary Ann Williamson practice?
Dr. Williamson practices at 595 W State St, Doylestown, PA 18901. Dr. Williamson's primary practice is Penn Medicine Doylestown Health in Doylestown, Pennsylvania. Dmand AI also links Dr. Williamson to 1 hospital, 3 group practices and clinics and 2 medical groups.
What is Dr. Mary Ann Williamson's office phone number?
The practice phone on file for Dr. Williamson is (215) 345-2321.
What is Dr. Mary Ann Williamson's medical license number?
Dr. Williamson holds Pennsylvania license MD448085.
Which hospitals is Dr. Mary Ann Williamson affiliated with?
Dr. Williamson is affiliated with Doylestown Hospital. Dmand AI links Dr. Williamson to 1 more hospital.
What medical group is Dr. Mary Ann Williamson part of?
Dr. Williamson is linked to Doylestown Health Vascular Surgery. Dmand AI links Dr. Williamson to 2 more medical groups.
Does Dr. Mary Ann Williamson accept Medicare?
Yes. CMS data shows Dr. Williamson billed Medicare for 3,376 services in 2024, and Dr. Williamson accepts Medicare assignment.
How many Medicare patients does Dr. Mary Ann Williamson see?
CMS counts 1,451 Medicare patients who saw Dr. Williamson in 2024, with an average age of 76.
What services does Dr. Mary Ann Williamson bill to Medicare?
In 2024, Dr. Williamson's most billed Medicare services were office visit, established patient (99214), heart test or procedure (93000) and heart test or procedure (93306).
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What drugs does Dr. Mary Ann Williamson prescribe most?
In 2024 Medicare Part D data, Dr. Williamson's most prescribed drugs by claims were Metoprolol Succinate, Eliquis and Rosuvastatin Calcium.
Has Dr. Mary Ann Williamson received payments from drug or device companies?
CMS Open Payments shows $3,197 in general payments to Dr. Williamson from 25 companies from 2016 to 2025. The largest total came from Novartis Pharmaceuticals Corporation.
How long has Dr. Mary Ann Williamson been practicing?
Dr. Williamson graduated from medical school in 2006, 20 years ago.
Does Dr. Mary Ann Williamson do research?
Dmand AI links 1 publication to Dr. Williamson.
Who does Dr. Mary Ann Williamson publish with?
Dr. Williamson's most frequent co-authors are Eli V. Gelfand, MD (1 shared paper).
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