NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sylvia Tan, M.D.

Internal Medicine Physician in Guymon, OK · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1700809720

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Sylvia Tan
Credential M.D.
Sex Female
Practice address 350 Ne 12th St, Guymon, OK, 73942
Phone (580) 338-8700
Fax (580) 338-8600
Enumeration date Jul 25, 2006
Last updated in NPPES Aug 20, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 19772 (OK) Primary
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
100009120B Medicaid OK -

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 → Validate an NPI →

Frequently asked questions

What is the NPI number for Sylvia Tan?
The National Provider Identifier (NPI) for Sylvia Tan is 1700809720, a Type 1 (individual) record in the CMS NPPES registry.
Where does Sylvia Tan practice?
The practice location on file with NPPES is in Guymon, OK. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-20.