Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Marc C Johnson
Audiologist in Baltimore, MD · enumerated 2014.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1942617147
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Registry record
Entity type Individual (Type 1)
Name Dr. Marc C Johnson
Sex Male
Practice address 601 N Caroline St Fl 6, Department of Otolaryngology- Head and Neck Surgery, Baltimore, MD, 21287
Phone (410) 955-6153
Enumeration date Jul 20, 2014
Last updated in NPPES Aug 11, 2016
Taxonomy & licenses
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
Where does Marc Johnson practice?
The practice location on file with NPPES is in Baltimore, MD. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Marc Johnson?
The National Provider Identifier (NPI) for Marc Johnson is 1942617147, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Juan Garcia Anaplastologist · Baltimore, MD NPI 1003840166 Steven Sweet Surgical Physician Assistant · Baltimore, MD NPI 1336337906 Carrie Nieman Otolaryngology Physician · Baltimore, MD NPI 1245529684 Jason Nellis Otolaryngology Physician · Baltimore, MD NPI 1457612350 Kevin Motz Otolaryngology Physician · Baltimore, MD NPI 1609126077 Nyall London Otolaryngology Physician · Baltimore, MD NPI 1609119296 Ashley Davis Speech-Language Pathologist · Baltimore, MD NPI 1700230125 Colleen Zenczak-Magill Audiologist · Baltimore, MD NPI 1043732613
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-08-11.