William Joseph Mattiace, MD
Family Medicine Physician · Williamsport, PA
William Joseph Mattiace, MD is a family medicine physician with a practice address in Williamsport, Pennsylvania, and NPI 1518906262, issued on Jun 6, 2006. Check the license (Pennsylvania MD044878L, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- William Joseph Mattiace
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- MD044878L PA
Self-reported in NPPES; status is on the state search - Practice location
- 1205 River Ave, Williamsport, PA 17701
- Phone
- (570) 323-5991
- Enumerated
- Jun 6, 2006
- Record last updated
- Dec 21, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (570) 323-6578
- Medicaid ID
- 0012801050003 PA
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 7,483 in Pennsylvania → Look up another NPI →
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Verify William Joseph Mattiace in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD044878LCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
18 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
William Joseph Mattiace among 7,483 family medicine physician records in Pennsylvania
William Joseph Mattiace, MD is one of 7,483 family medicine physician records with a practice address in Pennsylvania. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2015 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
60 family medicine physician records list a practice address in Williamsport
They are 60 of the 1,371 NPPES records with a practice address in Williamsport, and 7,483 family medicine physician records in Pennsylvania.
All 7,483 in Pennsylvania → Every provider in Williamsport → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- David Ambrose, MDWilliamsport, PA 177011497723936
- Elizabeth Anderson, MDWilliamsport, PA 177011427026970
- John Boll, D.O.Williamsport, PA 177011073516944
- Mona Chang, MDWilliamsport, PA 177011639159825
- Kenneth Durrwachter, MDWilliamsport, PA 177011992702682
- F Funk, MDWilliamsport, PA 177011548261126
- Andrew Haussmann, MDWilliamsport, PA 177011174583314
- Timothy HeilmannWilliamsport, PA 177011912968827
Common questions
What is William Joseph Mattiace, MD's NPI number?
William Joseph Mattiace, MD's National Provider Identifier (NPI) is 1518906262, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Joseph Mattiace, MD located?
The NPPES record lists a practice address at 1205 River Ave, Williamsport, PA, 17701. Phone: (570) 323-5991. Providers update this record themselves, so call before visiting.
How can I verify William Joseph Mattiace, MD's license?
NPPES lists Pennsylvania license number MD044878L, 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 Joseph Mattiace, MD prescribe under Medicare Part D?
In 2024, William Joseph Mattiace, MD had 18 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. 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.