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NORTHWEST OHIO GASTROENTEROLOGY ASSOCIATES INC.
NPI 1306945084
Internal Medicine - Gastroenterology in Toledo, OH

Active since September 21, 2006CLIA 36D2043070 · Certificate of Compliance
4841 MONROE ST, SUITE 110, TOLEDO, OH 43623(419) 471-1317(419) 471-1316 Get Directions Write a Review

NPPES record last updated: July 21, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 21, 2022, Sep 28, 2021 (2 updates tracked since 2021).

About Northwest Ohio Gastroenterology Associates Inc. NPPES

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

NORTHWEST OHIO GASTROENTEROLOGY ASSOCIATES INC. (NPI 1306945084) is a healthcare organization registered as a gastroenterology in Toledo, Ohio and active in the NPI registry since September 2006. The organization holds a CLIA Certificate of Compliance certificate valid through June 27, 2027 and lists David Zack, D.o., as its authorized official.

NPPES Registry Identity

NPI1306945084
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameNORTHWEST OHIO GASTROENTEROLOGY ASSOCIATES INC.
Location Address4841 MONROE ST, SUITE 110Toledo, OH 43623-4385
Mailing Address4841 Monroe St, Suite 110Toledo, OH 43623-4385 · (419) 471-1317 · Fax (419) 471-1316
Phone(419) 471-1317
Fax(419) 471-1316
Organization SubpartNo
Authorized OfficialDavid ZackD.o. · (419) 471-1350
Enumeration DateSeptember 21, 2006
Last NPPES UpdateJuly 21, 20222 updates tracked since enumeration
NPPES CertifiedSeptember 28, 2021
✔ NPI 1306945084 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
4841 MONROE ST, Toledo, OH 43623
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Other Identifiers 2

Medicaid0125313OH
OtherCA4246OH · Railroad Medicare

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Northwest Ohio Gastroenterology Associates Inc. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by November 30, 2026

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date
StateOhioEnrollment IDO20061214000078Non-DME Part B · Clinic/Group PracticeDue dateNovember 30, 2026
Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

8

Medicare enrollment records show 8 clinicians reassign Medicare billing to Northwest Ohio Gastroenterology Associates Inc., which bills Medicare for the services they deliver. Of these, 6 practice at this address and 8 within 10 miles. They are listed nearest first.

Clinicians, nearest first (8)

Scott Corman, D.O.
Gastroenterology
NPI 1750584991
4841 MONROE ST SUITE 110
Toledo, OH 43623
(419) 471-1317
✔ PECOS✔ Accepts MedicareSame address
Jennifer Smolenski
Nurse Practitioner
NPI 1770959223
4841 MONROE ST STE 110
Toledo, OH 43623
(419) 471-1350
✔ PECOS✔ Accepts MedicareSame address
Christine Haggerty
Nurse Practitioner
NPI 1457649089
4841 MONROE ST
Toledo, OH 43623
(419) 471-1350
✔ PECOS✔ Accepts MedicareSame address
Syed Uzair Hamdani, M.D.
Gastroenterology
NPI 1992718514
4841 MONROE ST SUITE 110
Toledo, OH 43623
(419) 471-1350
✔ PECOS✔ Accepts MedicareSame address
Michael Pappas, MD
Gastroenterology
NPI 1437110442
4841 MONROE ST SUITE 110
Toledo, OH 43623
(419) 471-1350
✔ PECOS✔ Accepts MedicareSame address
David Zack, D.O.
Gastroenterology
NPI 1407955008
4841 MONROE ST SUITE 110
Toledo, OH 43623
(419) 471-1317
✔ PECOS✔ Accepts MedicareSame address
Surendra Singh, M.D.
Pathology
NPI 1245290105
3170 W CENTRAL AVE
Toledo, OH 43606
(419) 534-3500
✔ PECOS✔ Accepts Medicare1.3 mi
Connie Mcclain, FNP
Nurse Practitioner
NPI 1366828048
4405 N HOLLAND SYLVANIA RD
Toledo, OH 43623
(419) 870-1727
✔ PECOS3.0 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Compliance 36D2043070

Northwest Ohio Gastroenterology · Toledo, OH
Active · expires Jun 27, 2027
CLIA Number36D2043070
Laboratory TypePhysician Office
Certificate Effective DateJune 28, 2025
Certificate Expiration DateJune 27, 2027
Laboratory DirectorSurendra P. Singh
Laboratory Phone(419) 471-1350
Laboratory LocationNorthwest Ohio Gastroenterology4841 Monroe Street, Suite 110, Toledo, OH 43623
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

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 Northwest Ohio Gastroenterology Associates Inc.'s NPI number?

The NPI number for Northwest Ohio Gastroenterology Associates Inc. is 1306945084. It was assigned to this organization in the NPPES registry on September 21, 2006.

Where is Northwest Ohio Gastroenterology Associates Inc. located?

Northwest Ohio Gastroenterology Associates Inc. is located at 4841 Monroe St Suite 110, Toledo, OH 43623. The listed phone number is (419) 471-1317.

What is Northwest Ohio Gastroenterology Associates Inc.'s specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Northwest Ohio Gastroenterology Associates Inc. enrolled in Medicare?

Yes. Northwest Ohio Gastroenterology Associates Inc. is registered in the Medicare PECOS enrollment system.

When is Northwest Ohio Gastroenterology Associates Inc.'s Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (Ohio, Clinic/Group Practice) is due for revalidation by November 30, 2026. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through Northwest Ohio Gastroenterology Associates Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 8 clinicians in 3 Medicare specialties reassign their Medicare billing to Northwest Ohio Gastroenterology Associates Inc.. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Gastroenterology (4), Nurse Practitioner (3) and Pathology (1). Of these, 6 practice at this address and 8 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Northwest Ohio Gastroenterology Associates Inc. hold a CLIA laboratory certificate?

Yes. A Certificate of Compliance (number 36D2043070) is associated with this NPI, valid through June 27, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

What insurance does Northwest Ohio Gastroenterology Associates Inc. accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and Molina Healthcare list Northwest Ohio Gastroenterology Associates Inc. as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Northwest Ohio Gastroenterology Associates Inc. was last updated on July 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years 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.