Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Lois J Masters, PA-C
Hospitalist Physician in York, PA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1598838286
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Ms. Lois J Masters
Credential PA-C
Sex Female
Practice address 1001 S George St, 3rd Floor, York, PA, 17403
Phone (717) 851-4005
Fax (717) 812-2495
Enumeration date Nov 17, 2006
Last updated in NPPES Apr 22, 2022
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License C0000423 (MD) Secondary
363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License MA002620L (PA) Secondary
208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License MA002620L (PA) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1607789 | Other | PA | GATEWAY MEDICARE ASSURED |
| 2696386 | Other | PA | HIGHMARK BLUE SHIELD - FREEDOM BLUE |
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
How do I verify Lois Masters's NPI record?
Cross-check NPI 1598838286 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1598838286 active?
Yes, as of the latest NPPES snapshot, NPI 1598838286 is active (record last updated 2022-04-22).
Other providers at this practice address
Browse all → Steven Delaveris Family Medicine Physician · York, PA NPI 1104820968 Jefferson Pindzola Anatomic Pathology & Clinical Pathology Physician · York, PA NPI 1114924313 Gordon Zubrod Family Medicine Physician · York, PA NPI 1033111927 David Baker Anesthesiology Physician · York, PA NPI 1144212622 Bassam Hammudi Anesthesiology Physician · York, PA NPI 1558355776 Sallie Denner Certified Registered Nurse Anesthetist · York, PA NPI 1972597979 Shawn Slenker Pharmacotherapy Pharmacist · York, PA NPI 1538154430 Gerard Waggenspack Diagnostic Radiology Physician · York, PA NPI 1336135243
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-04-22.