Matilda Sylvia Mason, M.D
Internal Medicine Physician · Hackettstown, NJ
Matilda Sylvia Mason, M.D is an internal medicine physician with a practice address in Hackettstown, New Jersey, and NPI 1205141959, issued on Aug 18, 2010. Check the license (New Jersey 25MA09712200, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Matilda Sylvia Mason
- Credential
- M.D
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 25MA09712200 NJ
268687 NY
Self-reported in NPPES; status is on the state search - Practice location
- 651 Willow Grove St, Hackettstown, NJ 07840
- Phone
- (908) 441-1161
- Enumerated
- Aug 18, 2010
- Record last updated
- Jul 18, 2025
- Fax
- (973) 383-4572
- Medicare enrollment
- Enrolled (PECOS I20160201000024); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 4,632 in New Jersey → Look up another NPI →
Also registered at 651 Willow Grove St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Louise BaszakRegistered Dietitian1659788172
- Christine BoveSpeech-Language Pathologist1285822577
- Grace Caico, RDRegistered Dietitian1497961312
- William Carle, MDEmergency Medicine Physician1366465924
- Kelsey Clark, DOEmergency Medicine Physician1962080390
Verify Matilda Sylvia Mason in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA09712200Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average internal medicine physician in 2024
209 Medicare Part D claims for 111 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 14 claims were for opioids.
Most prescribed
- Cefdinir23 claims
- Prednisone13 claims
- Pantoprazole Sodium12 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.
Bills Medicare through one group practice
- Practice Associates Medical GroupMorristown, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Matilda Sylvia Mason among 4,632 internal medicine physician records in New Jersey
Matilda Sylvia Mason, M.D is one of 4,632 internal medicine physician records with a practice address in New Jersey. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 66% of them.
- NPI issued2010 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2002 · median 2000 among the 3,132 with a school on file
- Record last updated2025 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
26 internal medicine physician records list a practice address in Hackettstown
They are 26 of the 575 NPPES records with a practice address in Hackettstown, and 4,632 internal medicine physician records in New Jersey.
All 4,632 in New Jersey → Every provider in Hackettstown → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Antonella Auciello, M.D.Hackettstown, NJ 078401629064043
- Jimmy Chang, M.D.Hackettstown, NJ 078401629082300
- Devi Gollapudi, M.D.Hackettstown, NJ 078401841248036
- Keri Ingrassia-Squiers, DOHackettstown, NJ 078401467465203
- Kenneth Janowski, DOHackettstown, NJ 078401629017017
- Uldis Jansons, MDHackettstown, NJ 078401255312054
- Sanjay Kavathia, M.D.Hackettstown, NJ 078401124078142
- Ahmad Maatouk, M.D.Hackettstown, NJ 078401790938066
Common questions
What is Matilda Sylvia Mason, M.D's NPI number?
Matilda Sylvia Mason, M.D's National Provider Identifier (NPI) is 1205141959, issued on Aug 18, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Matilda Sylvia Mason, M.D located?
The NPPES record lists a practice address at 651 Willow Grove St, Hackettstown, NJ, 07840. Phone: (908) 441-1161. Providers update this record themselves, so call before visiting.
How can I verify Matilda Sylvia Mason, M.D's license?
NPPES lists New Jersey license number 25MA09712200, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Matilda Sylvia Mason, M.D prescribe under Medicare Part D?
In 2024, Matilda Sylvia Mason, M.D had 209 Medicare Part D claims for 111 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.