Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John Joseph Hartmann, D.O.
Specialist in Dubuque, IA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1154394989
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Registry record
Entity type Individual (Type 1)
Name Dr. John Joseph Hartmann
Credential D.O.
Sex Male
Practice address 1500 Delhi St, Ste 4100, Dubuque, IA, 52001
Phone (563) 557-5900
Fax (563) 557-5905
Enumeration date Feb 10, 2006
Last updated in NPPES May 26, 2010
Taxonomy & licenses
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD.
About the DO credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 080087202 | Other | IA | RAILROAD MEDICARE |
| 2186619 | Medicaid | IA | - |
| 421462387 | Other | IA | MISCELLANEOUS INSURANCE |
| 1154394989 | Other | IA | NPI |
| 11539 | Other | IA | DEAN HEALTHCARE |
| 55309 | Other | IA | WELLMARK BCBS NUMBER |
| IA0105 | Other | IA | JOHN DEERE HEALTHCARE |
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
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.
What specialty is John Hartmann?
John Hartmann is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-05-26.