Dr. John G Hartmann, D.D.S.

Dr. John G Hartmann is a General Practice Dentistry provider (Dentist) practicing in River Forest, IL, registered in the NPPES registry with NPI 1720167539 since 2006. The credential DDS stands for Doctor of Dental Surgery.

✓ Active NPI ✓ Valid NPI checksum

NPI	1720167539
Entity type	Individual (Type 1)
Name	Dr. John G Hartmann
Credential	D.D.S.
Sex	Male
Practice address	7700 MADISON ST, River Forest, IL, 60305
Phone	7083666760
Fax	7083666762
Enumeration date	2006-11-03
Last updated in NPPES	2007-07-08

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
1223G0001X	General Practice Dentistry	Primary	—	IL

DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Copy-ready billing details

Provider: John Hartmann, D.D.S.
NPI: 1720167539
Taxonomy: 1223G0001X (General Practice Dentistry)
Address: 7700 MADISON ST, River Forest, IL, 60305

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1922234244	Courtney Villari	Individual	Dentist	River Forest, IL
1669748430	Courtney R Villari DDS	Organization	Dentist	River Forest, IL
1962747584	River Forest Dental Studio	Organization	General Practice Dentistry	River Forest, IL

Verify this record

Cross-check NPI 1720167539 against the authoritative CMS record: view Dr. John G Hartmann 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

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 General Practice Dentistry. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.