Mark Steven Spitzer

Primary specialty

Otolaryngology PhysicianTaxonomy code 207Y00000X

License

20A5347 Issued in CA

Practice address

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

Phone

(209) 934-8077

Fax

(209) 233-9400

NPI assigned

Aug 16, 2005

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Otolaryngology

Education

Other, 1981

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Timothy S Johnston MD PCGroup PAC ID 1456638238, 9 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Mercy Medical Center Hospital, Merced, CA, CCN 050444

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mark.spitzer.p1@direct.castle.nextgenshare.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Timothy S. Johnston, M.D. PC

  • Family Medicine Physician
  • Merced, CA
  • NPI 1407306665
  Medicare reassignment Care Compare group NPD (past)
• Dignity Health Medical Foundation

  • Multi-Specialty Clinic/Center
  • Sacramento, CA
  • NPI 1700803418
  NPD
• Timothy S. Johnston, M.D. PC

  • Bone Densitometry Radiologic Technologist
  • Merced, CA
  • NPI 1033614193
  NPD
• Timothy S. Johnston, M.D. PC

  • Otolaryngology Physician
  • Merced, CA
  • NPI 1972483493
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Dignity Health

  • General Acute Care Hospital
  • Merced, CA
  • NPI 1518018191
  Care Compare affiliation

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

{
    "created_epoch": "1124150400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765843200000",
    "number": "1407848435",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "410 E YOSEMITE AVE STE B",
            "city": "MERCED",
            "state": "CA",
            "postal_code": "953408220",
            "telephone_number": "209-934-8077",
            "fax_number": "209-233-9400"
        },
        {
            "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",
            "fax_number": "209-233-9400"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SPITZER",
        "first_name": "MARK",
        "middle_name": "STEVEN",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-08-16",
        "last_updated": "2025-12-16",
        "certification_date": "2025-12-16",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Y00000X",
            "taxonomy_group": "",
            "desc": "Otolaryngology",
            "state": "CA",
            "license": "20A5347",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Katie Erin Souza, P.T.A.
• Marvin Souza, RPH
• Salvatore G Souza, DDS
• Samantha Sparks
• Russell Evans Speer, DDS
• Eric Jerel Spivey II
• William Kendall Springer, O.D.
• St Anthonys Senior Care
• St Anthonys Senior Care LLC
• St Thomas Dental Group Inc

• Otolaryngology Physician in Merced, CA
• Providers in Merced, CA by specialty
• Otolaryngology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 16, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.