Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. John Mark Stevenson Sr., HAD-F

Hearing Instrument Specialist in Marietta, GA · enumerated 2006.

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

National Provider Identifier

1740395920

Verified

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Registry record

Entity type Individual (Type 1)

Name Mr. John Mark Stevenson Sr.

Credential HAD-F

Sex Male

Practice address 145 N Marietta Pkwy, Suite E, Marietta, GA, 30060

Phone (770) 590-8662

Enumeration date Aug 20, 2006

Last updated in NPPES Jun 1, 2022

Taxonomy & licenses

237700000X Hearing Instrument Specialist Speech, Language and Hearing Service Providers · License 2124 (AL) Secondary

237700000X Hearing Instrument Specialist Speech, Language and Hearing Service Providers · License HADS000963 (GA) Primary

Other identifiers

Identifier	Type	State	Issuer
035185274	Other	GA	DL

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 specialty is John Stevenson?

John Stevenson is registered in NPPES with the primary taxonomy of Hearing Instrument Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-06-01.