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

Michael Kleyn, MD

Individual provider Critical Care Medicine (Internal Medicine) Physician · NPI 1275761207

Michael Kleyn, MD is an Internal Medicine in Mountainside, New Jersey. Qualified in 2008, 18 years ago. Practices with Rwjbh Observation Associates LLC, a 971-clinician group and accepts Medicare assignment. Licensed in Florida and New Jersey.

Years since qualifying
18
Licensed in
FL, NJ
In the registry since
2009
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

6 Highpoint Dr
Mountainside, NJ 07092-1502
Phone: (718) 207-3140
Show map & directions

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

Specialties & licences

Critical Care Medicine (Internal Medicine) Physician (primary) Taxonomy 207RC0200X · Licence 25MA09504100 (NJ)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence ME 122780 (FL)

Record details

NPI number1275761207
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 29, 2009
Last updated in NPPESDecember 8, 2015
Mailing address6 Highpoint Dr, Mountainside, NJ 07092-1502

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesCRITICAL CARE (INTENSIVISTS)
Medical schoolOTHER
Graduated 2008 (18 years in practice)
Group practice Rwjbh Observation Associates Llc — 971 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount