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

Douglas Riegert-Johnson, MD

Individual provider Gastroenterology Physician · NPI 1609840768

Douglas Riegert-Johnson, MD practises Gastroenterology in Jacksonville, Florida. Graduated from University of Alabama School of Medicine in 1999, 27 years ago. Practices with Mayo Clinic Jacksonville, a 1,581-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Florida.

Years since qualifying
27
Trained at
University of Alabama School of Medicine
Licensed in
FL
In the registry since
2006
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

4500 San Pablo Rd S
Jacksonville, FL 32224-1865
Phone: (904) 953-2000
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence ME101296 (FL)

Record details

NPI number1609840768
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 15, 2006
Last updated in NPPESAugust 28, 2020
Certification dateAugust 28, 2020

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolUNIVERSITY OF ALABAMA SCHOOL OF MEDICINE
Graduated 1999 (27 years in practice)
Group practice Mayo Clinic Jacksonville — 1581 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 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 104 times · 80th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 101 times · 77th 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 patients433
Services billed 646 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

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.

Colleagues at Mayo Clinic Jacksonville

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1581 clinicians in the practice; 12 are shown here.

Other providers in Jacksonville