Is MARK T. O'BRIEN, D.O., P.C. active?

No — MARK T. O'BRIEN, D.O., P.C. is no longer active. The Michigan registry lists it as dissolved, as of the 2026-08-16 source snapshot. The status is republished verbatim from the Secretary of State record.

Where is MARK T. O'BRIEN, D.O., P.C. registered?

MARK T. O'BRIEN, D.O., P.C. is registered in Michigan under company number 800982661, first registered on April 20, 2007.

What type of company is MARK T. O'BRIEN, D.O., P.C.?

MARK T. O'BRIEN, D.O., P.C. is registered as a professional corporation with the Michigan Secretary of State.

Does MARK T. O'BRIEN, D.O., P.C. have UCC liens?

No UCC financing statements name MARK T. O'BRIEN, D.O., P.C. as debtor in the indexed state registries.

Is MARK T. O'BRIEN, D.O., P.C. a federal contractor?

No federal contract awards or SAM.gov recipient records are matched to MARK T. O'BRIEN, D.O., P.C. in the indexed federal datasets.

Does MARK T. O'BRIEN, D.O., P.C. hold any licenses?

1 license and credential record is matched to MARK T. O'BRIEN, D.O., P.C.. Each license, its type and issuing authority is listed in the Licenses section above.

What public records are linked to MARK T. O'BRIEN, D.O., P.C.?

2 public records are linked to MARK T. O'BRIEN, D.O., P.C.: 1 in Filings, 1 in Licenses & authorities — matched across federal, state and municipal registers by its registered legal names.

Where does this data come from?

Every fact on this profile is republished from official public registers — Secretary of State filings, UCC indexes and federal datasets. Each section names its issuing register and the snapshot Netstate last retrieved (latest: 2026-08-16).

MARK T. O'BRIEN, D.O., P.C. — Michigan Professional corporation No. 800982661: Dissolved, 1 filing

MARK T. O'BRIEN, D.O., P.C. is a Michigan professional corporation, registered on April 20, 2007. It is based at 2170 HUNTER'S PARK W, ST CLAIR, MI, 48079, United States. The company has since been marked dissolved on the Michigan register and is registered under company number 800982661. Public records for the company include 1 SoS registration and 1 Medicare provider record. Every fact here is republished from an official public register and traces back to a primary source document.

Legal entity name	MARK T. O'BRIEN, D.O., P.C.
Principal address	2170 HUNTER'S PARK WST CLAIR48079MIUnited States
Mailing address	2170 HUNTER'S PARK W, ST CLAIR, MI, 48079, US
Registration state	Michigan
Status	Dissolved
Registered	20 April 2007 (over 19 years ago)
Dissolved	2024-08-22
Entity type	Professional corporation
Standing	not compliant
Company number	800982661
Registered agent	MARK T O'BRIEN
Source registry	Michigan Department of Licensing and Regulatory Affairs · updated 10 August 2026
Public records	1 SoS registration

State	License / ID	Type	Issued	Status
—	1396943015	Medicare / NPI provider	07/03/2007	Unknown
credential — deactivation date — entity type code 2 enumeration date 07/03/2007 first name — last name — last update date 08/22/2020 mailing address 1 4150 RIVER RD mailing address 2 SUITE F2 mailing city EAST CHINA mailing country US mailing postal code 480542915 mailing state MI middle name — npi 1396943015 organization name MARK T. O'BRIEN, D.O., P.C. practice address 1 4150 RIVER RD practice city EAST CHINA practice postal code 480542915 practice state MI reactivation date — taxonomy code 1 207Q00000X Source: NPI registry · document npi/

MARK T. O'BRIEN, D.O., P.C.

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Nearby in the Michigan register

State	Business name	Filed	Registered agent	Officers	Status
MichiganTHIS	MARK T. O'BRIEN, D.O., P.C.	2007-04-20	MARK T O'BRIEN	—	Dissolved
Filing ID 800982661 Jurisdiction Domestic · Professional corporation Principal address 2170 HUNTER'S PARK W, ST CLAIR, MI, 48079, United States Registered agent MARK T O'BRIEN2170 HUNTER'S PARK W, ST CLAIR, MI, 48079 Officers Not reported