Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Obstetric and Gynecologic Assoc of Cortland MD PC

Obstetrics & Gynecology Physician in Cortland, NY · enumerated 2007 · authorized official In Whan Oh, President MD.

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

National Provider Identifier

1588711402

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Registry record

Entity type Organization (Type 2)

Legal business name Obstetric and Gynecologic Assoc of Cortland MD PC

Practice address 11 Alvena Ave, Suite 101, Cortland, NY, 13045

Phone (607) 753-7578

Fax (607) 758-3193

Enumeration date Jan 4, 2007

Last updated in NPPES Mar 14, 2013

Taxonomy & classification

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 1472741 (NY) Primary

207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License 1472741 (NY) Secondary

207VX0000X Obstetrics Physician Allopathic & Osteopathic Physicians · License 1472741 (NY) Secondary

Authorized official

Name In Whan Oh

Title President MD

Phone (607) 753-7578

Other identifiers

Identifier	Type	State	Issuer
02288420	Medicaid	NY	-
33D0165489	Other	NY	CLIA

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

What is the NPI number for Obstetric and Gynecologic Assoc of Cortland MD PC?

The NPI for Obstetric and Gynecologic Assoc of Cortland MD PC is 1588711402, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Obstetric and Gynecologic Assoc of Cortland MD PC?

NPPES lists In Whan Oh (President MD) as the authorized official for this organization.

Providers at this address

Browse all →

Marcelo Gareca Infectious Disease Physician · Cortland, NY NPI 1346221959 Jacqueline Tomko Women's Health Nurse Practitioner · Cortland, NY NPI 1467535898 Peter Iannotta Medical Physician Assistant · Cortland, NY NPI 1174680144 Cathy Zarzecki Physician, PC Pediatrics Physician · Cortland, NY NPI 1841529229 Rachel Avery Nurse Practitioner · Cortland, NY NPI 1205785219

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-03-14.