Steven Markham, DDS

Steven Markham is a General Practice Dentistry provider (Dentist) practicing in Yucaipa, CA, registered in the NPPES registry with NPI 1598847527 since 2006. The credential DDS stands for Doctor of Dental Surgery.

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1598847527
Entity type	Individual (Type 1)
Name	Steven Markham
Credential	DDS
Sex	Male
Practice address	Yucaipa, CA, 92399
Phone	9097904537
Enumeration date	2006-10-19
Last updated in NPPES	2007-07-08

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
1223G0001X	General Practice Dentistry	Primary	52646	CA

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

Copy-ready billing details

Provider: Steven Markham, DDS
NPI: 1598847527
Taxonomy: 1223G0001X (General Practice Dentistry)
Address: Yucaipa, CA, 92399

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1497462295	Jeein Kim	Individual	General Practice Dentistry	Yucaipa, CA

Verify this record

Cross-check NPI 1598847527 against the authoritative CMS record: view Steven Markham 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 Steven Markham?

Steven Markham 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.