Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John Onyemaechi Nnadi, MD

Individual provider Internal Medicine Physician · NPI 1558506782

John Onyemaechi Nnadi, MD is an Internal Medicine in Baton Rouge, Louisiana. Qualified in 1999, 27 years ago. Practices with Ochsner Clinic LLC, a 2,842-clinician group, works from 3 locations, accepts Medicare assignment and offers telehealth. Licensed in Delaware, Louisiana and Mississippi.

Years since qualifying
27
Licensed in
DE, LA, MS
In the registry since
2008
Specialties on file
5
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

17000 Medical Center Dr
Baton Rouge, LA 70816-3246
Phone: (225) 752-2470
Show map & directions

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

Additional practice locations (2)

  • 7777 Hennessy Blvd Ste 701, Baton Rouge, LA 70808-4370 — (225) 765-5864
  • 5000 Hennessy Blvd, Baton Rouge, LA 70808-4375 — (225) 765-5864

Specialties & licences

Infectious Disease Physician (primary) Taxonomy 207RI0200X · Licence MD.202997 (LA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 20962 (MS)
Internal Medicine Physician Taxonomy 207R00000X · Licence MD.202997 (LA)
Infectious Disease Physician Taxonomy 207RI0200X · Licence 20962 (MS)
Infectious Disease Physician Taxonomy 207RI0200X · Licence C1-0025159 (DE)

Record details

NPI number1558506782
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 2, 2008
Last updated in NPPESNovember 17, 2022
Certification dateNovember 17, 2022

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1999 (27 years in practice)
Group practice Ochsner Clinic Llc — 2842 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations7 on file with Medicare

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