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

Dr. Ayan Chatterjee, MD

Individual provider Internal Medicine Physician · NPI 1265845804

Dr. Ayan Chatterjee, MD practises Ophthalmology in King of Prussia, Pennsylvania. Graduated from Pennsylvania State University College of Medicine in 2014, 12 years ago. Practices with Delaware Valley Vision Associates Group Practice, LLC, a 14-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Massachusetts and North Carolina.

Years since qualifying
12
Trained at
Pennsylvania State University College of Medicine
Licensed in
MA, NC
In the registry since
2014
Specialties on file
3
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

200 Mall Blvd
King of Prussia, PA 19406-2902
Phone: (866) 407-1852
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Additional practice locations (1)

  • 123 Summer St, Worcester, MA 01608-1216 — (508) 363-6208

Specialties & licences

Glaucoma Specialist (Ophthalmology) Physician (primary) Taxonomy 207WX0009X · Licence 2018-00306 (NC)
Internal Medicine Physician Taxonomy 207R00000X · Licence 259852 (MA)
Ophthalmology Physician Taxonomy 207W00000X · Licence 2018-00306 (NC)

Record details

NPI number1265845804
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 10, 2014
Last updated in NPPESJanuary 27, 2019

Medicare enrollment

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

Medicare specialtyOPHTHALMOLOGY
Medical schoolPENNSYLVANIA STATE UNIVERSITY COLLEGE OF MEDICINE
Graduated 2014 (12 years in practice)
Group practice Delaware Valley Vision Associates Group Practice, Llc — 14 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 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.

Cataract surgery 614 times · 97th 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.

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 patients609
Services billed 2,680 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Consulting Fee $4,208 3 payments
Food and Beverage $3,230 45 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Wills Eye Hospital Hospital · Philadelphia, PA

Colleagues at Delaware Valley Vision Associates Group Practice, LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 14 clinicians in the practice; 11 are shown here.

Other providers in King of Prussia