Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Leonard I Mastbaum, MD

Endocrinology, Diabetes & Metabolism Physician in Fort Wayne, IN · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1619928249

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Leonard I Mastbaum

Credential MD

Sex Male

Practice address 11123 Parkview Plaza Dr, Suite 202, Fort Wayne, IN, 46845

Phone (260) 373-4280

Fax (260) 373-4288

Enumeration date May 16, 2006

Last updated in NPPES Mar 23, 2013

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 01041346 (IN) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
100360850	Medicaid	IN	-
000000606758	Other	IN	ANTHEM

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Leonard Mastbaum practice?

The practice location on file with NPPES is in Fort Wayne, IN. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Leonard Mastbaum?

The National Provider Identifier (NPI) for Leonard Mastbaum is 1619928249, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Sailaja Blackmon Obstetrics & Gynecology Physician · Fort Wayne, IN NPI 1316946718 John Drake Obstetrics & Gynecology Physician · Fort Wayne, IN NPI 1265431589 Ronald Baker Obstetrics & Gynecology Physician · Fort Wayne, IN NPI 1952300329 Matthew Barb Pediatrics Physician · Fort Wayne, IN NPI 1366426157 Kathleen Bohnke Pediatrics Physician · Fort Wayne, IN NPI 1801870639 Ronald Sarrazine Internal Medicine Physician · Fort Wayne, IN NPI 1538146709 Northeast Obstetrics & Gynecology, LLC Medical Specialty Clinic/Center · Fort Wayne, IN NPI 1811941024 Julie Platt Maternal & Fetal Medicine Physician · Fort Wayne, IN NPI 1467488734

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-03-23.