Gregory John Duncan, M.D.
Gregory John Duncan is a Orthopaedic Surgery Physician provider (Orthopaedic Surgery) practicing in Wrangell, AK, registered in the NPPES registry with NPI 1164459921 since 2006. The credential MD stands for Doctor of Medicine.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1164459921 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Gregory John Duncan |
| Credential | M.D. |
| Sex | Male |
| Practice address | Wrangell, AK, 99929 |
| Phone | 7079519203 |
| Enumeration date | 2006-06-27 |
| Last updated in NPPES | 2023-02-09 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207X00000X | Orthopaedic Surgery Physician | Primary | A44032 | CA |
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 |
|---|---|---|---|
| A044032 | Other | CA | CALIFORNIA MEDICAL LICENSE |
| P00181543 | Other | CA | RAILROAD MEDICARE |
| 00A440320 | Medicaid | CA | — |
Copy-ready billing details
Provider: Gregory Duncan, M.D. NPI: 1164459921 Taxonomy: 207X00000X (Orthopaedic Surgery Physician) Address: Wrangell, AK, 99929
Verify this record
Cross-check NPI 1164459921 against the authoritative CMS record: view Gregory John Duncan 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 2023-02-09.