Dr. Patrick Mark O'Brien, M.D.
Dr. Patrick Mark O'Brien is a Orthopaedic Surgery Physician provider (Orthopaedic Surgery) practicing in Sioux Falls, SD, registered in the NPPES registry with NPI 1861615155 since 2007. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1861615155 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Patrick Mark O'Brien |
| Credential | M.D. |
| Sex | Male |
| Practice address | 911 E 20TH ST STE 300, Sioux Falls, SD, 57105 |
| Phone | 6053221300 |
| Fax | 6053221301 |
| Enumeration date | 2007-04-11 |
| Last updated in NPPES | 2019-10-31 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207X00000X | Orthopaedic Surgery Physician | Secondary | 2014-01725 | NC |
| 207X00000X | Orthopaedic Surgery Physician | Primary | 10105 | SD |
MD — Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential
Copy-ready billing details
Provider: Patrick O'Brien, M.D. NPI: 1861615155 Taxonomy: 207X00000X (Orthopaedic Surgery Physician) Address: 911 E 20TH ST STE 300, Sioux Falls, SD, 57105
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1740493493 | Aaron Pemberton | Individual | Orthopaedic Surgery Physician | Sioux Falls, SD |
| 1386816106 | Justin Krajca | Individual | Orthopaedic Trauma Physician | Sioux Falls, SD |
| 1508185794 | Jonathan Buchanan | Individual | Sports Medicine (Internal Medicine) Physician | Sioux Falls, SD |
| 1164734422 | John Faryna | Individual | Orthopaedic Surgery Physician | Sioux Falls, SD |
| 1497048896 | Kathlyn Drexler | Individual | Orthopaedic Hand Surgery Physician | Sioux Falls, SD |
| 1437670965 | Tiffany Johnston | Individual | Nurse Practitioner | Sioux Falls, SD |
| 1659872265 | Tara Poe | Individual | Athletic Trainer | Sioux Falls, SD |
| 1649993817 | Timothy Fagerness | Individual | Orthopaedic Surgery of the Spine Physician | Sioux Falls, SD |
Verify this record
Cross-check NPI 1861615155 against the authoritative CMS record: view Dr. Patrick Mark O'Brien 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
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2019-10-31.