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

Dr. Leonard Paul Blass, MD

Individual provider Infectious Disease Physician · NPI 1780678599

Dr. Leonard Paul Blass, MD is an Infectious Disease Physician in Warren, Ohio. Licensed in Ohio. Registered with an NPI since 2005.

Licensed in
OH
In the registry since
2005
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

1350 E Market St
Warren, OH 44483-6608
Phone: (330) 841-9699
Fax: (330) 841-9569
Show map & directions

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

Specialties & licences

Infectious Disease Physician (primary) Taxonomy 207RI0200X · Licence 35-04-5525-B (OH)

Record details

NPI number1780678599
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 7, 2005
Last updated in NPPESJuly 13, 2026