John J Hagan, MD
John J Hagan is a Internal Medicine Physician provider (Internal Medicine) practicing in Bismarck, ND, registered in the NPPES registry with NPI 1598819856 since 2007. The credential MD stands for Doctor of Medicine. Practices at St Alexius Medical Center (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1598819856 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | John J Hagan |
| Credential | MD |
| Sex | Male |
| Practice address | 900 E BROADWAY AVENUE, Bismarck, ND, 58501 |
| Phone | 7015307000 |
| Fax | 7015308842 |
| Enumeration date | 2007-01-23 |
| Last updated in NPPES | 2008-01-28 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | Primary | 8370 | ND |
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 |
|---|---|---|---|
| P00137588 | Other | ND | RR MEDICARE |
| 11248 | Medicaid | ND | — |
Copy-ready billing details
Provider: John Hagan, MD NPI: 1598819856 Taxonomy: 207R00000X (Internal Medicine Physician) Address: 900 E BROADWAY AVENUE, Bismarck, ND, 58501
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1558348193 | Timothy Gold | Individual | Anesthesiology Physician | Bismarck, ND |
| 1376624445 | Chatree Wongjirad | Individual | Neurology Physician | Bismarck, ND |
| 1841343191 | Jerry Town | Individual | Certified Registered Nurse Anesthetist | Bismarck, NC |
| 1033262506 | Kim Geiger | Individual | Certified Registered Nurse Anesthetist | Bismarck, ND |
| 1023161585 | Renee Christ | Individual | Certified Registered Nurse Anesthetist | Bismarck, ND |
| 1295888774 | Jerome Maddock | Individual | Certified Registered Nurse Anesthetist | Bismarck, ND |
| 1396898649 | Arla Teske | Individual | Certified Registered Nurse Anesthetist | Bismarck, ND |
| 1336283928 | St Alexius Medical Center | Organization | Community/Retail Pharmacy | Bismarck, ND |
Verify this record
Cross-check NPI 1598819856 against the authoritative CMS record: view John J Hagan 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 2008-01-28.