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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. LEONARD PAUL BLASS M.D.
NPI 1780678599
Internal Medicine - Infectious Disease in Warren, OH

Active since September 07, 2005
1350 E MARKET ST, WARREN, OH 44483(330) 841-9699(330) 841-9569 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Leonard Paul Blass M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. LEONARD PAUL BLASS M.D. (NPI 1780678599) is an individual infectious disease provider in Warren, Ohio, licensed in Ohio (35-04-5525-B) and active in the NPI registry since September 2005.

NPPES Registry Identity

NPI1780678599
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. LEONARD PAUL BLASSCredential: M.D.
Location Address1350 E MARKET STWarren, OH 44483-6608
Mailing Address340 N Linden CtWarren, OH 44484-6038 · (330) 841-9609 · Fax (330) 841-9569
Phone(330) 841-9699
Fax(330) 841-9569
Sole ProprietorNo
Enumeration DateSeptember 7, 2005
Last NPPES UpdateJuly 13, 2026
✔ NPI 1780678599 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in OH · 35-04-5525-B
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
1350 E MARKET ST, Warren, OH 44483
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Other Identifiers 1

Medicaid0647705OH

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

SAQIB RANGOONWALA MD
Student in an Organized Health Care Education/Training Program
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (330) 675-5706
INSIGHT FOUNDATION OF TRUMBULL
Rehabilitation Unit
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (810) 275-9333
TRUMBULL PATHOLOGY ASSOCIATES
Pathology (Anatomic Pathology & Clinical Pathology)
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (330) 841-9346
FORUM HEALTH SERVICES
Clinic/Center (Urgent Care)
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (330) 841-1144
KALEY ANN COFFEY MD
Student in an Organized Health Care Education/Training Program
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (330) 841-9470
PAMELA S, EVANS RD LD
Dietitian, Registered
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (330) 841-9850
WARREN OHIO HOSPITAL COMPANY LLC
General Acute Care Hospital
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (330) 841-9820
MR. JOHNNY JOSEPH NAPLES II PA-C
Physician Assistant (Medical)
1350 E MARKET ST
WARREN, OH 44483
Trumbull County (330) 841-9011

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Leonard Blass's NPI number?

The NPI number for Leonard Blass is 1780678599. It was assigned to this individual provider in the NPPES registry on September 7, 2005.

Where is Leonard Blass located?

Leonard Blass practices at 1350 E Market St, Warren, OH 44483. The listed phone number is (330) 841-9699.

What is Leonard Blass's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

When was this NPI record last updated?

The NPPES record for Leonard Blass was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.