Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Katherine Duffey

Individual provider Gastroenterology Physician · NPI 1851888929

Katherine Duffey practises Gastroenterology in Philadelphia, Pennsylvania. Graduated from Jefferson Medical College of Thomas Jefferson University in 2018, 8 years ago. Practices with Jefferson University Physicians, a 1,554-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Pennsylvania.

Years since qualifying
8
Trained at
Jefferson Medical College of Thomas Jefferson University
Licensed in
PA
In the registry since
2018
Specialties on file
2
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Practice location Address checks out

833 Chestnut St Ste 220
Philadelphia, PA 19107-4405
Phone: (215) 955-8465
Show map & directions

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

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence MD473869 (PA)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD473869 (PA)

Record details

NPI number1851888929
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorNo
NPI enumeratedApril 15, 2018
Last updated in NPPESMarch 18, 2026
Certification dateMarch 18, 2026

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolJEFFERSON MEDICAL COLLEGE OF THOMAS JEFFERSON UNIVERSITY
Graduated 2018 (8 years in practice)
Group practice Jefferson University Physicians — 1554 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 24 times · 50th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 16 times · 47th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Practises at

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

Colleagues at Jefferson University Physicians

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1554 clinicians in the practice; 12 are shown here.

Other providers in Philadelphia