Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Fnu Zain Ul Abideen, MD

Individual provider Internal Medicine Physician · NPI 1760941926

Fnu Zain Ul Abideen, MD practises Internal Medicine in Williamsport, Pennsylvania. Qualified in 2011, 15 years ago. Practices with Regional Health Services Inc, a 576-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying
15
Licensed in
PA
In the registry since
2019
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

700 High St
Williamsport, PA 17701-3100
Phone: (570) 321-2850
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD477885 (PA)
Hospitalist Physician Taxonomy 208M00000X · Licence MD477885 (PA)

Record details

NPI number1760941926
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 18, 2019
Last updated in NPPESJuly 21, 2023
Certification dateJuly 21, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolOTHER
Graduated 2011 (15 years in practice)
Group practice Regional Health Services Inc — 576 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients400
Services billed 1,279 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Regional Health Services Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 576 clinicians in the practice; 12 are shown here.

Other providers in Williamsport