Dr. Mary Mattheos has practiced internal medicine in Lindenhurst since 1987. We first built her site in 2020, then rebuilt it on our new platform: the same address and content patients know, now faster, clearer and easier to book from.
251
Insurance plans from 17 carriers, searchable
5
Departments, each with its own page
4×
Faster home page on a phone
100
Accessibility score on every page tested
Accepted insurance
The question every new patient calls about. Patients type a carrier or a plan name and get the answer in a second, and anyone who doesn’t see their plan is sent straight to the office. Try it.
251 accepted plans from 17 carriers
1199SEIU1
Aetna111
+ 108 more
Caterpillar2
Cigna1
EmblemHealth7
+ 4 more
EmblemHealth (Formerly known as HIP)2
Empire Plan1
Harvard Pilgrim Care Health2
Healthfirst NY2
Humana93
+ 90 more
MagnaCare1
Medicare1
Tricare1
UnitedHealthOne2
UnitedHealthcare19
+ 16 more
UnitedHealthcare Community Plan1
UnitedHealthcare Oxford4
+ 1 more
A working copy of the insurance search, with the carriers and plans listed on drmattheos.com in November 2026.
Departments & doctors
Internal medicine, cardiology, diabetes care, nephrology and chiropractic. Each department page names who treats patients there and explains every condition it lists in plain language.
Dr. James Tsiakos, MDCardiology, Internal Medicinedrmattheos.com/departments/cardiology/
Led by Dr. James J Tsiakos, MD, available for consultations every Thursday.
12 conditions explained
Heart Attack. Occurs when blood flow to part of the heart muscle is blocked, usually by a clot in a coronary artery.
Booking, measured
Every Book An Appointment button calls the office. The old site counted those clicks through Google Tag Manager; we rebuilt the same five events in the site’s own code, with the same names, so the practice’s reports carried on through the switch. Click a button.
Primary care in Lindenhurst
Phone menu
Appointments
Google Analytics · events
A demo for this page. On drmattheos.com these events go to the practice’s Google Analytics, on the live site only. The names match the old setup exactly, down to the old spelling of “btton” on the Appointments page.
Speed, measured
Before switching over, we tested the previous site and the new one side by side with Google Lighthouse, the engine behind PageSpeed Insights.
Phone speed: 68 on the old site, 96 on the new site.
Phone speed
was 68
Computer speed: 90 on the old site, 100 on the new site.
Computer speed
was 90
4×
faster home page
Main content on a phone in 2.4 s, down from 10.3 s
78%
less data per page
1.6 MB down to about 0.4 MB
100
accessibility
On every page tested, up from 86–91
Google Lighthouse, October 26, 2026: two to three runs of each page on a phone and on a computer, middle result, old site and new site measured the same way. Scores are averaged across the six pages listed.
What we built
Today’s hours at the top of every page, and every Book button calls the office.
Dr. Mattheos, her physician assistants and the cardiology and chiropractic doctors, each with their background.
Each department explains its conditions and answers common questions about hours, insurance and booking.
Every page kept its address, and Google gets the address, hours, phone number and FAQs in a form it reads directly.
Their Google Analytics property, recovered from the old site, plus the booking-click events rebuilt in code.
No plugins that need constant security patches, and every page over a secure connection.
We design it, build it, move your old site over without losing a visitor, and keep it fast.
