Dr. Joseph James Merlo Jr., MD, PHD

Individual provider Clinical Pathology Physician · NPI 1225327596

Dr. Joseph James Merlo Jr., MD, PHD is a Pathology in Danville, Pennsylvania. Qualified in 2011, 15 years ago. Practices with Geisinger Clinic, a 3,413-clinician group and accepts Medicare assignment. Licensed in Pennsylvania.

Years since qualifying: 15
Licensed in: PA
In the registry since: 2011

What do these letters mean?

MD — Doctor of Medicine: A physician who completed allopathic medical school.
PHD — Doctor of Philosophy: A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

100 N Academy Ave
Danville, PA 17822-9800
Phone: (570) 271-6338
Fax: (570) 271-6105

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Pathology Physician (primary)	Taxonomy 207ZC0006X · Licence MD491207 (PA)

Record details

NPI number	1225327596
Entity type	Individual (Type 1)
Gender	Male
Credentials	MD , PHD
Sole proprietor	No
NPI enumerated	April 7, 2011
Last updated in NPPES	November 5, 2025
Certification date	November 5, 2025

Medicare enrollment

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

Medicare specialty	PATHOLOGY
Medical school	OTHER
Graduated	2011 (15 years in practice)
Group practice	Geisinger Clinic — 3413 clinicians
Accepts Medicare assignment	Yes — accepts the Medicare-approved amount
Practice locations	2 on file with Medicare