NPIMap

Organization Active NPI

Timothy S. Johnston, M.D. PC

Doing business as Yosemite ENT

  • Otolaryngology Physician
  • Merced, CA
National Provider Identifier
1972483493
Registry record updated Nov 3, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Otolaryngology PhysicianTaxonomy code 207Y00000X
Legal business name
TIMOTHY S. JOHNSTON, M.D. PC
Doing business as
Yosemite ENT
Practice address
410 E Yosemite Ave Ste B
Merced, CA 95340-8220
Phone
(209) 934-8077
NPI assigned
Sep 4, 2025
Organization subpart
Yes
Parent organization
TIMOTHY S. JOHNSTON, M.D. PCAs reported in NPPES

NPPES NPI Registry

Updated by the provider on Nov 3, 2025

Registry information is reported by the provider to CMS and is not verified. About this source

Authorized official

Name
Janette Purslow
Title
Credentialing Coordinator
Phone
(209) 349-8459

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Otolaryngology PhysicianGroup: 193400000X SINGLE SPECIALTY GROUP 207Y00000X Primary

Addresses

Primary practice location

410 E Yosemite Ave Ste B
Merced, CA 95340-8220

Mailing address

3349 G St Ste F
Merced, CA 95340-0978
Phone (209) 349-8459

Other names 1

  • Yosemite ENT Doing business as

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
O20170503002455 CA Part B Supplier - Clinic/Group Practice 1456638238 Receives reassigned benefits from 19 practitioners
3 other NPIs on this enrollment
This NPI is an additional NPI on the enrollment
Practice locations: Merced, CA

Other NPIs on the same Medicare enrollment 3

NPIs listed together on one Medicare enrollment, typically parts of the same organization.

National Provider Directory

National Provider Directory
Tax ID family
Timothy S Johnston MD PC3 organizations share this tax ID, including this one
Part of
Timothy S Johnston MD PC

Other organizations with this tax ID 2

Organizations that report the same tax identification number in the National Provider Directory.

Practitioners & affiliated clinicians

Practitioners 6

Individual providers connected to this organization through Medicare benefit reassignment, Care Compare group membership or National Provider Directory roles.

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1756944000000",
    "enumeration_type": "NPI-2",
    "last_updated_epoch": "1762128000000",
    "number": "1972483493",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "3349 G ST STE F",
            "city": "MERCED",
            "state": "CA",
            "postal_code": "953400978",
            "telephone_number": "209-349-8459",
            "fax_number": "209-580-4138"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "410 E YOSEMITE AVE STE B",
            "city": "MERCED",
            "state": "CA",
            "postal_code": "953408220",
            "telephone_number": "209-934-8077"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "organization_name": "TIMOTHY S. JOHNSTON, M.D. PC",
        "organizational_subpart": "YES",
        "parent_organization_legal_business_name": "TIMOTHY S. JOHNSTON, M.D. PC",
        "enumeration_date": "2025-09-04",
        "last_updated": "2025-11-03",
        "certification_date": "2025-11-03",
        "status": "A",
        "authorized_official_last_name": "PURSLOW",
        "authorized_official_first_name": "JANETTE",
        "authorized_official_title_or_position": "CREDENTIALING COORDINATOR",
        "authorized_official_telephone_number": "209-349-8459"
    },
    "taxonomies": [
        {
            "code": "207Y00000X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Otolaryngology",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "organization_name": "Yosemite ENT",
            "code": "3",
            "type": "Doing Business As"
        }
    ]
}

Other providers in Merced, CA

Sources for this page

  • NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 3, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
  • Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.