DR. GREGORY W SIEWNY (MD) – Obstetrics & Gynecology Physician, NPI 1891791216

DR. GREGORY W SIEWNY (MD) is a healthcare provider. based in Franklin, Ohio. specializing in Obstetrics & Gynecology Physician. They hold the professional credentials MD. They hold a License No. 35049923 (OH). The NPI Number for DR. GREGORY W SIEWNY (MD) is 1891791216

Main info

Male
44 Years Of Experience
Accepts Medicare Assignment
Name
DR. GREGORY W SIEWNY (MD)
NPI
1891791216
Phone
(513) 424-1440
Address
200 MEDICAL CENTER DR
Enumeration Date
21 June 2005
Last Update Date
24 April 2015

Doctor Profile

Medical School Name
OHIO STATE UNIVERSITY COLLEGE OF MEDICINE
Secondary Phone
5134241440
Graduation Year
1982 (44 years ago)
PAC ID
0143253435
Group Practice PAC ID
7517990898
Professional Enrollment ID
I20120208000361
Data current as of
19 May 2026

Profile Insights

NPPES metrics only — not quality of care.

Methodology
Experience54
Completeness75
Years active:20State licenses:1Digital endpointsOther names

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Provider Addresses for DR. GREGORY W SIEWNY (MD)

  • Medical Center Drive, University District District 4, Columbus, Franklin County, Ohio, 43210, United States

    SUITE 160

    FRANKLIN, OH 450055200

    Phone: (513) 424-1440

    Fax: (513) 424-1422

    Mailing address matches the actual address.

NPPES updates history

No NPPES updates recorded for this provider.

Prescription Activity

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Open Payments (CMS)

No Open Payments data available for this provider.

This can happen when there are no reportable CMS Open Payments records.

Medicare Enrollment & Revalidation

Source: CMS public data · Not endorsed by CMS ·

Educational use only—not medical, billing, or legal advice.

No Medicare enrollment or revalidation data available for this provider in our database.

Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS

Medicare Utilization (FFS)

Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·

Educational use only—not medical, billing, or legal advice.

No Medicare fee-for-service utilization data available for this provider in our database.

Insurance plans in this area (ZIP 45005)

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Group practice members

Group practice members are other physicians who share the same Group Practice PAC ID with this doctor. When doctors form a group practice and register in PECOS as a single entity, they receive a shared identification number. This table lists all providers in the same group practice.
PAC ID: 7517990898View full group profile
NameSpecialtyState
O B S T E T R I C S/ G Y N E C O L O G YOH
O B S T E T R I C S/ G Y N E C O L O G YOH
O B S T E T R I C S/ G Y N E C O L O G YOH
O B S T E T R I C S/ G Y N E C O L O G YOH
-OH
O B S T E T R I C S/ G Y N E C O L O G YOH

Reviews

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Frequently asked questions

Does DR. GREGORY W SIEWNY (MD) share an NPI with anyone else?
NPI numbers are unique to each provider or organization — DR. GREGORY W SIEWNY (MD) uses 1891791216.
Does CMS list DR. GREGORY W SIEWNY (MD) as active?
Yes — DR. GREGORY W SIEWNY (MD) is active in the NPI listing used on this page.
What is DR. GREGORY W SIEWNY (MD)'s primary classification?
Obstetrics & Gynecology Physician is the headline specialty for DR. GREGORY W SIEWNY (MD) here. Clinical services aligned with this taxonomy classification.
Where is DR. GREGORY W SIEWNY (MD) based?
DR. GREGORY W SIEWNY (MD) is tied to Franklin, Ohio in the data we show; additional addresses may exist on the full record.
Is specialty guaranteed by NPI alone?
Taxonomy selections describe intent; scope of practice still follows state law.

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