Stephen R. Master, MD
Clinical Pathology/Laboratory Medicine Physician · Philadelphia, PA
Stephen R. Master, MD is a clinical pathology/laboratory medicine physician with a practice address in Philadelphia, Pennsylvania, and NPI 1396780821, issued on Jun 18, 2006. Check the license (Pennsylvania MD425041, as entered in NPPES) on the Pennsylvania Department of State (PALS); the Medicare figures below come from public CMS files.
- Name
- Stephen R. Master
- Credential
- MD
- Primary taxonomy
- Clinical Pathology/Laboratory Medicine Physician 207ZP0105X
- License number
- MD425041 PA
Self-reported in NPPES; status is on the state search - Practice location
- 3400 Spruce Street, Philadelphia, PA 19104
- Phone
- (215) 662-6503
- Enumerated
- Jun 18, 2006
- Record last updated
- Mar 10, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 0016038050003 PA
- Entity
- Type 1 · individual
8 nearest clinical pathology/laboratory medicine physician records → All 86 in Pennsylvania → Look up another NPI →
Also registered at 3400 Spruce Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Stephanie Abbuhl, MDEmergency Medicine Physician1649215195
- Shahrzad Abdollahi, M.D.Rheumatology Physician1518494178
- Sarah Abdulla, MDVascular & Interventional Radiology Physician1427342336
- Alice Abernathy, MDObstetrics & Gynecology Physician1740711498
- Mariam Aboian, M.D., PH.D.Diagnostic Radiology Physician1356669386
- Samir Abu Gazala, M.D.Surgery Physician1750708251
Verify Stephen R. Master in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersPennsylvania Department of State (PALS)
Search for license MD425041Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $7,788.00
1 payment: consulting fee; the largest payer was Roche Diagnostics Corporation. The 177 providers of this specialty with any payment received $7,028.16 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.
Stephen R. Master among 86 clinical pathology/laboratory medicine physician records in Pennsylvania
Stephen R. Master, MD is one of 86 clinical pathology/laboratory medicine physician records with a practice address in Pennsylvania. 55% 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 16% of them.
- NPI issued2006 · 16% of these records are older, 38% newer
- In a Medicare fileYes · 55% of these records are
- In the CMS Doctors and Clinicians fileNo · 42% of these records are
- Record last updated2011 · 87% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207ZP0105X and a Pennsylvania practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Clinical Pathology/Laboratory Medicine Physician providers in Pennsylvania
There are 86 clinical pathology/laboratory medicine physician records in Pennsylvania.
All 86 in Pennsylvania → Every provider in Philadelphia → Clinical Pathology/Laboratory Medicine Physician nationwide →
The 8 clinical pathology/laboratory medicine physician records with the nearest ZIP codes
- Agata Bogusz, MDPhiladelphia, PA 191041891998407
- Kojo Elenitoba-Johnson, MDPhiladelphia, PA 191041912077330
- Dale Frank, MDPhiladelphia, PA 191041336185180
- Paul Howlett, M.D.Philadelphia, PA 191041104933514
- Jameel Iqbal, M.D.Philadelphia, PA 191041699937987
- Frederick Johnson, MD PHDPhiladelphia, PA 191041962446872
- Malek Kamoun, MDPhiladelphia, PA 191041588609010
- Eline Luning Prak, MDPhiladelphia, PA 191041669415907
Common questions
What is Stephen R. Master, MD's NPI number?
Stephen R. Master, MD's National Provider Identifier (NPI) is 1396780821, issued on Jun 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Stephen R. Master, MD located?
The NPPES record lists a practice address at 3400 Spruce Street, Philadelphia, PA, 19104. Phone: (215) 662-6503. Providers update this record themselves, so call before visiting.
How can I verify Stephen R. Master, MD's license?
NPPES lists Pennsylvania license number MD425041, 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.
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.