Dr. Sinclair W Armstrong Jr., MD
Dr. Sinclair W Armstrong Jr. is a Urology Physician provider (Urology) practicing in Fort Smith, AR, registered in the NPPES registry with NPI 1861435752 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1861435752 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Sinclair W Armstrong Jr. |
| Credential | MD |
| Sex | Male |
| Practice address | 7001 ROGERS AVE, Fort Smith, AR, 72903 |
| Phone | 4794522077 |
| Enumeration date | 2006-06-14 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 208800000X | Urology Physician | Primary | R-2359 | AR |
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: Sinclair Armstrong, MD NPI: 1861435752 Taxonomy: 208800000X (Urology Physician) Address: 7001 ROGERS AVE, Fort Smith, AR, 72903
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1467456954 | Andre Nolewajka | Individual | Interventional Cardiology Physician | Fort Smith, AR |
| 1073570156 | Stuart Haraway | Individual | Obstetrics & Gynecology Physician | Fort Smith, AR |
| 1013960442 | Raymond Goodman | Individual | Surgery Physician | Fort Smith, AR |
| 1396786042 | Eastside Ob/Gyn P.L.L.C. | Organization | Obstetrics & Gynecology Physician | Fort Smith, AR |
| 1740224831 | Timothy Bell | Individual | Obstetrics & Gynecology Physician | Fort Smith, AR |
| 1568406650 | Casey Laws | Individual | Obstetrics & Gynecology Physician | Fort Smith, AR |
| 1073557005 | Melissa Rainwater | Individual | Obstetrics & Gynecology Physician | Fort Smith, AR |
| 1962430504 | Christopher Coleman | Individual | Surgery Physician | Fort Smith, AR |
Verify this record
Cross-check NPI 1861435752 against the authoritative CMS record: view Dr. Sinclair W Armstrong Jr. 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 2007-07-08.