Mary Ann Williamson, M.D.
Cardiovascular Disease Physician · Doylestown, PA
Mary Ann Williamson, M.D. is a cardiovascular disease physician with a practice address in Doylestown, Pennsylvania, and NPI 1598931206, issued on May 2, 2008. Check the license (Pennsylvania MD448085, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Mary Ann Williamson
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- MD448085 PA
Self-reported in NPPES; status is on the state search - Practice location
- 315 W State St, Doylestown, PA 18901
- Phone
- (215) 345-1900
- Enumerated
- May 2, 2008
- Record last updated
- Jun 15, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicaid ID
- 1028437000001 PA
- Medicare enrollment
- Enrolled (PECOS I20130727000034); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 1,476 in Pennsylvania → Look up another NPI →
Also registered at 315 W State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Adenaike, MDCardiovascular Disease Physician1700049939
- Bruce Applestein, M.D, FACCCardiovascular Disease Physician1568403137
- Lawrence Bish, MDCardiovascular Disease Physician1871883603
- Jennifer Brown, MSN, CRNPNurse Practitioner1477596914
- Lindsey Carter, CRNPNurse Practitioner1225350986
- Elliot FeldbaumCardiovascular Disease Physician1265929939
Verify Mary Ann Williamson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD448085Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% more Medicare Part D claims than the average cardiovascular disease physician in 2024
5,865 Medicare Part D claims for 750 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Metoprolol Succinate857 claims
- Eliquis582 claims
- Rosuvastatin Calcium532 claims
- Atorvastatin Calcium526 claims
- Losartan Potassium294 claims
- Lisinopril255 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: $496.42
31 payments; by number, the most common kind was food and beverage; the largest payer was Novartis Pharmaceuticals Corporation. The 16,686 providers of this specialty with any payment received $3,819.56 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 2 group practices
- Clinical Specialty AssociatesDoylestown, PA
- Via AffiliatesDoylestown, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mary Ann Williamson among 1,476 cardiovascular disease physician records in Pennsylvania
Mary Ann Williamson, M.D. is one of 1,476 cardiovascular disease physician records with a practice address in Pennsylvania. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 64% of them.
- NPI issued2008 · 64% of these records are older, 31% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2006 · median 2000 among the 1,003 with a school on file
- Record last updated2015 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in Pennsylvania
There are 1,476 cardiovascular disease physician records in Pennsylvania.
All 1,476 in Pennsylvania → Every provider in Doylestown → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Michael Adenaike, MDDoylestown, PA 189011700049939
- Bruce Applestein, M.D, FACCDoylestown, PA 189011568403137
- Eric Gejer, DODoylestown, PA 189011104863067
- Francis Grzywacz, M.D.Doylestown, PA 189011104037274
- James Guarino, MDDoylestown, PA 189011679572713
- James Kmetzo, M.D, FACCDoylestown, PA 189011154362614
- Richard Mascolo, M.D, FACCDoylestown, PA 189011225079965
- Joseph McGarvey, M.D.Doylestown, PA 189011235138835
Common questions
What is Mary Ann Williamson, M.D.'s NPI number?
Mary Ann Williamson, M.D.'s National Provider Identifier (NPI) is 1598931206, issued on May 2, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ann Williamson, M.D. located?
The NPPES record lists a practice address at 315 W State St, Doylestown, PA, 18901. Phone: (215) 345-1900. Providers update this record themselves, so call before visiting.
How can I verify Mary Ann Williamson, M.D.'s license?
NPPES lists Pennsylvania license number MD448085, as entered by the provider. Search the Pennsylvania Department of State (PALS) at https://www.pals.pa.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mary Ann Williamson, M.D. prescribe under Medicare Part D?
In 2024, Mary Ann Williamson, M.D. had 5,865 Medicare Part D claims for 750 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. 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.