Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory T Maclennan, MD

Anatomic Pathology Physician in Cleveland, OH · enumerated 2006.

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

National Provider Identifier

1992731681

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Gregory T Maclennan

Credential MD

Sex Male

Practice address 11100 Euclid Ave, Cleveland, OH, 44106

Phone (216) 844-7494

Fax (216) 286-6341

Enumeration date Jun 24, 2006

Last updated in NPPES Aug 25, 2010

Taxonomy & licenses

207ZB0001X Blood Banking & Transfusion Medicine Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZC0006X Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZC0500X Cytopathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZD0900X Dermatopathology (Pathology) Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZF0201X Forensic Pathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZH0000X Hematology (Pathology) Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZI0100X Immunopathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZM0300X Medical Microbiology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZN0500X Neuropathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZP0007X Molecular Genetic Pathology (Pathology) Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZP0101X Anatomic Pathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Primary

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZP0104X Chemical Pathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZP0105X Clinical Pathology/Laboratory Medicine Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

207ZP0213X Pediatric Pathology Physician Allopathic & Osteopathic Physicians · License 35068763 (OH) Secondary

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
000000224302	Other	OH	UNISON
0154381	Medicaid	OH	-
000000528772	Other	OH	ANTHEM
P00412500	Other	OH	RAILROAD MEDICARE
000000582772	Other	OH	ANTHEM
1100396	Other	OH	UHC
000000031604	Other	OH	ANTHEM
363794	Other	OH	WELLCARE
0127464	Other	OH	BCMH
220017463	Other	OH	RAILROAD MEDICARE
658175	Other	OH	AETNA
744995	Other	OH	BUCKEYE

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 Gregory Maclennan practice?

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

What is the NPI number for Gregory Maclennan?

The National Provider Identifier (NPI) for Gregory Maclennan is 1992731681, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-08-25.