Dr. Mark Thomas Ryan, D.O.

Dr. Mark Thomas Ryan is a Orthopaedic Surgery Physician provider (Orthopaedic Surgery) practicing in Warren, MI, registered in the NPPES registry with NPI 1043338833 since 2007. The credential DO stands for Doctor of Osteopathic Medicine.

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NPI	1043338833
Entity type	Individual (Type 1)
Name	Dr. Mark Thomas Ryan
Credential	D.O.
Sex	Male
Practice address	25625 SCHOENHERR RD, Warren, MI, 48089
Phone	5867594700
Fax	5867591504
Enumeration date	2007-03-27
Last updated in NPPES	2014-09-29

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
207X00000X	Orthopaedic Surgery Physician	Primary	5101016208	MI

DO — Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
200E009780	Other	MI	BCBSM/BCN

Copy-ready billing details

Provider: Mark Ryan, D.O.
NPI: 1043338833
Taxonomy: 207X00000X (Orthopaedic Surgery Physician)
Address: 25625 SCHOENHERR RD, Warren, MI, 48089

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1154309029	Richard Scott	Individual	Orthopaedic Surgery of the Spine Physician	Warren, MI
1770561839	Progressive Rehab Network Ltd	Organization	Physical Therapy Clinic/Center	Warren, MI
1932172855	Fremont Scott	Individual	Orthopaedic Surgery Physician	Warren, MI
1215111075	Bicounty Orthopedic Surgeons, PC	Organization	Orthopaedic Surgery Physician	Warren, MI
1316261092	Bi County Medical Practices	Organization	Orthopaedic Surgery Physician	Warren, MI

Verify this record

Cross-check NPI 1043338833 against the authoritative CMS record: view Dr. Mark Thomas Ryan on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Mark Ryan?

Mark Ryan is registered in NPPES with the primary taxonomy of Orthopaedic Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2014-09-29.