William Merriam, M.D.
Urology Physician · West Chester, PA
William Merriam, M.D. is a urology physician with a practice address in West Chester, Pennsylvania, and NPI 1912043258, issued on Jan 30, 2007. Check the license (Pennsylvania MD427453, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- William Merriam
- Credential
- M.D.
- Primary taxonomy
- Urology Physician 208800000X
- License number
- MD427453 PA
Self-reported in NPPES; status is on the state search - Practice location
- 915 Old Fern Hill RD, West Chester, PA 19380
- Phone
- (610) 692-4270
- Enumerated
- Jan 30, 2007
- Record last updated
- Oct 21, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (610) 692-2566
- Medicare enrollment
- Enrolled (PECOS I20070529000462); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest urology physician records → All 663 in Pennsylvania → Look up another NPI →
Also registered at 915 Old Fern Hill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeanette Agrian, PTA, CMTPhysical Therapy Assistant1801917695
- Jennifer Akins, MDObstetrics & Gynecology Physician1295716611
- Roger Alburn, ODOptometrist1285634626
- Donald Andersen, M.D.Urology Physician1003846817
- William Atkins, MDObstetrics & Gynecology Physician1255312757
- Monica Austin, PHPhysician Assistant1205875705
Verify William Merriam in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD427453Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% more Medicare Part D claims than the average urology physician in 2024
2,490 Medicare Part D claims for 569 beneficiaries, against an average of 1,340 among the 10,782 providers of this specialty who prescribed in Part D.
Most prescribed
- Tamsulosin Hcl857 claims
- Finasteride433 claims
- Orgovyx162 claims
- Silodosin123 claims
- Alfuzosin Hcl Er86 claims
- Xtandi79 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 92.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,834.41
58 payments; by number, the most common kind was food and beverage; the largest payer was Procept BioRobotics Corporation. The 9,340 providers of this specialty with any payment received $3,800.04 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
- The Centers For Advanced Urology LLPWest Chester, PA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Merriam among 663 urology physician records in Pennsylvania
William Merriam, M.D. is one of 663 urology physician records with a practice address in Pennsylvania. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 49% of them.
- NPI issued2007 · 49% of these records are older, 43% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2007 · median 2004 among the 420 with a school on file
- Record last updated2011 · 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 208800000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Urology Physician providers in Pennsylvania
There are 663 urology physician records in Pennsylvania.
All 663 in Pennsylvania → Every provider in West Chester → Urology Physician nationwide →
The 8 urology physician records with the nearest ZIP codes
- Donald Andersen, M.D.West Chester, PA 193801003846817
- Ilene Wong, M.D.West Chester, PA 193801477740934
- Michael Chiusano, DOWest Grove, PA 193901366415150
- Jerry Gotlieb, MDNorristown, PA 194011336132968
- Dennis Braun, MDEast Norriton, PA 194031659364537
- Marc Osias, MDEast Norriton, PA 194031821081753
- Brian Rosenthal, DOEast Norristown, PA 194031922091891
- Robert Perch, MDKing Of Prussia, PA 194061649390451
Common questions
What is William Merriam, M.D.'s NPI number?
William Merriam, M.D.'s National Provider Identifier (NPI) is 1912043258, issued on Jan 30, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William Merriam, M.D. located?
The NPPES record lists a practice address at 915 Old Fern Hill RD, West Chester, PA, 19380. Phone: (610) 692-4270. Providers update this record themselves, so call before visiting.
How can I verify William Merriam, M.D.'s license?
NPPES lists Pennsylvania license number MD427453, 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 William Merriam, M.D. prescribe under Medicare Part D?
In 2024, William Merriam, M.D. had 2,490 Medicare Part D claims for 569 beneficiaries; the average among urology physician prescribers was 1,340. Part D covers Medicare prescriptions only.
What is William Merriam, M.D.'s MIPS final score?
The 2023 MIPS final score is 92.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.