Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mark Douglas Horness, MD
Surgery Physician in Midland, MI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1033108998
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Registry record
Entity type Individual (Type 1)
Name Dr. Mark Douglas Horness
Credential MD
Sex Male
Practice address 4011 Orchard Dr, Suite 2000, Midland, MI, 48640
Phone (989) 631-1221
Fax (989) 631-6686
Enumeration date Oct 13, 2005
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 1923733 | Medicaid | MI | - |
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.
Frequently asked questions
What specialty is Mark Horness?
Mark Horness is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
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.
Other providers at this practice address
Browse all → East Central Oncology Associates Hematology & Oncology Physician · Midland, MI NPI 1104811405 East Central Oncology Associates Plc Hematology & Oncology Physician · Midland, MI NPI 1073508255 Ellsworth Ludwig Surgery Physician · Midland, MI NPI 1689663510 Mymichigan Medical Group Surgery Physician · Midland, MI NPI 1386694768 Faith Fuentes Neurology Physician · Midland, MI NPI 1619013646 Brian R Copeland MD PC Specialist · Midland, MI NPI 1750575817 Nps Associates, LLC Ambulatory Surgical Clinic/Center · Midland, MI NPI 1437477619 Angela Zaucha Family Nurse Practitioner · Midland, MI NPI 1376887471
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.